EEVblog

[@InssiAjaton]

The GDT (Gas Discharge Tube) is a low voltage, high current surge clamping device. It can pass discharge currents that would instantly kill zeners, TransZorbs and similar. The dot in the glass tube side is a small drop of some radioactive isotope that standardizes the trigger voltage level. That is what reveals it is a low voltage version. Depending on ionization caused by ambient background radiation is not repeatable enough on the low voltages like below 100 V. High voltage versions don’t need the radioactive dot and can be bought for about 200 to 800 V variants in basically the same housings.

[@ODriveRobotics]

Hi Dave, I'm the creator of the ODrive. Sorry the demo was such a tease, I should have made it do something more fun on startup. If you are interested I can send you a firmware image that has a much more fun demo. If you want to try to send commands, note that the command set in the instructions are for the UART, which is on GPIO 1 and 2 on header J3, and is not the same as the USB. Let me know if you have any other questions or want to do a skype call where I can walk you though any of this. Thanks for all your great content, Cheers, Oskar.

[@PlanXV]

madcowswe what is the red motor and where can I buy it from.?

[@ODriveRobotics]

The red motor is a Chinese no-brand N5065 motor that I imported in bulk. You can buy it here: odriverobotics.com/shop/

[@SidneyCritic]

It's a shame Dave rushes everything because he missed that the prop hub bolts to the other side.

[@PlanXV]

madcowswe thanks

[@electronash]

madcowswe Was the intention that the propellers were to be used, or were they just included with the motors anyway? (I guess the Odrive could be used for drones / planes, but it's aimed at general servo / control projects?) Any reason why the calibration doesn't do a full rotation, or does it get enough info from the smaller movement? ie. it relies mainly on the accuracy of the encoder anyway (which is very accurate), so moving for one motor phase is enough. Also, does the board use any feedback from the motor Back-EMF too, or just use the encoders?

[@zeptobit2507]

I wasn't sure if I would include design documentation or not when I ordered the first batch of boards, so I didn't include the D. But the D should be there, It's on the second batch of boards. Thank you very much for showing my product.

[@chadkrause6574]

Do more on that motor controller! That thing looks cool

[@VileVermin]

just couple of links: odriverobotics.com github.com/madcowswe/ODrive

[@raceautomotiveelectronics2447]

Thanks

[@MakersMuse]

Cool of Oskar to send you the ODrive! I've bought one from him to retrofit to a core XY 3D Printer... can't wait to see how fast it can go (hoping for 'shakes itself off the table' fast)

[@wetmelon]

We (those of us who hang out on the ODrive discord) have been waiting to see what you do with it!

[@MakersMuse]

haha! Literally just got back from silly season visits. So much to catch up on.

[@sonbrother6167]

I recommend clamps for your shaking issues sir. lol really though isn't that what we all strive for.

[@procactus9109]

Did you get a 3rd one for the extruder :P

[@oOWaschBaerOo]

@eevblog the "propellerthingy" goes on the backside of the motor ! brushless motors can take a wheel cogwheel propeller, on each side either on the shaft itself, or on the motor housing ! he send you a special adapter to be screwed to the backside of the brushless motor

[@josuelservin2409]

+

[@EEVblog2]

Yep, obvious now, I just didn't notice the screw holes on the back.

[@DavidKenny64]

One big clue was that the "motor housing" turns with the shaft. Can't use that to mount the motor. So it must be the drive side of the motor.

[@kwhp1507]

Those particular motors are called “outrunners”. The stator coil stays fixed in the center of the motor and powerful neodymium magnets are mounted to the rotating housing. The bracket included is standard issue with these motors. It aligns with the 4 holes on the face of that particular motor to mount it to a firewall on a rc plane. The other brushless motor are “inrunners” they are built backwards compared to the outrunners. The magnets are still the spinning components but are mounted on the motor shaft. That way the housing or “can” of the motor can be mounted in a clamp type of mount and are also safer to use in places where something can come into contact with the spinning housing of the outrunners. It is also worth mentioning that the inrunners are typically made to spin much much faster than the outrunners.

[@InssiAjaton]

The bifilar wound choke has virtually zero inductance, if the ferrite is removed. The proximity of the ferrite surface gives a small amount of inductance. But the idea appears to be that it also produces a very low Q. That could be beneficial for eliminating ringing. The same issue is a good idea in selecting the ferrite material for the noise reducing clamps which are normally characterized by their series impedance. The material data sheets generally show a graph of this impedance and its components, reactive and resistive parts. It is often the resistive part that really does the “work” for your filter.

[@onomatopejaB]

Dave! Propeller goes on back of the motor! Procedure at begining was some kind of autotune for servomotors. If you have bigger inertia and loud like a f.e. flywheel you need to „teach” your driver. 1/3 rotation is good enough because it is 3-phase motor with symetric windings. Encoder is off course for closed loop control - cool stuff :) Good quality integrated servo like Teknic ClearPaths starts from 250$. Cheers mate :)

[@GadgetReviewVideos]

Agreed, and I don’t think Dave understands the speed these things can do with the proper power and ESC controllers. Those clamps wouldn’t have a chance holding it down to the table at even 10% speed of those motors even if they are cheap red bottom motors.

[@Sekeletu]

I bet those clamps would hold the maximum speed of those motors. It's the dynamic you're talking about, not the speed itself.

[@GadgetReviewVideos]

Sekeletu, only if they ramp up slow, and slow down the same way. But if they just get power thrown at them, and cut off they jerk and move with a lot of thrust, even with no prop. I own a few of those for my planes, one is about the same size. Had a esc fail with no prop on the motor since I was in the house and just the thrust of the spin up, and stop when I pulled the battery or broke the fiberglass enforced nose off the plane, since the plane was screwed down in place. Then again, he had it PSU set to about 3amp? They usually run off a battery and esc speed controller designed to handle 100+ amps with some setups. So maybe the cosmos would have held since the over all power was low, and I don’t know what the board is designed to allow for the power rating either. But if he has a 2 or 3 cell lipo pack and the correct speed controller I think he will be surprised when it breaks loose from the clamps.

[@lexafied3d]

Large ships actually electrically charge their hulls(very low current) so that the salt water takes the electrons from the charge rather than the steel thus preventing rust. I don't think it would be useful on a car though, unless you plan to drive in the ocean every day. Edit: Sorry, I should elaborate: The system is called Impressed Current Cathodic Protection (ICCP), it supplies current to titanium anodes mounted along the outside of the hull and this provides protection to a certain area of the hull. And then it uses the hull as the negative to return to the device.

[@realedna]

The hull is not the return path, but it's made into a cathode which means it has a negative potential against the sea water, so that it is highly unlikely that metal atoms gets oxidized and being solved into the water as ions. The titanium withstands oxidation even at a positive potential and thus can suck electrons from the ocean to provide to the hull without being eaten away. So the ocean is the return path (for electrons) and is therefore needed.

[@GlennLittleford]

Its a servo motor Dave! The encoder stays in place. Used in CNC, like a stepper motor. Oskay is right, servo motors are expensive, but he has come up with a cheap option. I'll be following his project, very clever.

[@sonbrother6167]

The working mechanical interface is the red aluminum plate that's attached to the spindle on the side opposing the encoder was my initial assumption. I believe that you'd need the encoder to stay in place to get accurate stop\start\hold, you would also need the increased interface area to prevent trashing a keyed or set screw based transfer of torque. I have much more experience on the material/mechanical engineering side of this but I'm trying to learn as much as I can about other aspects of design.

[@jackevans2386]

The encoder gives shaft position info, required for knowing when to fire the next phase or pair of phases of the motor. Normally these motors employ the BEMF signal supplied by each unpowered motor phase winding for this job. The encoder in this design provides for hi-res absolute positional info.

[@oswaldjh]

I worked at a R&D Engineering firm several years ago when we were contracted to design and build one of these BS rust protection devices. He had to sign documents that protected us from legal trouble because we told him outright it wouldn't work. He signed, we built, he sold. I had worked at this firm for several years and sought other employment soon after this.

[@calyodelphi124]

Not entirely certain why you sought other employment after that particular client. Seems to me the engineering firm you worked for knew right off the bat they were being contracted to design and build a bullshit product, told the client outright it was bullshit, and made him sign legal waivers probably because he insisted it absolutely wasn't bullshit and wanted it designed and built anyways. They were just covering their arses from what they knew was a snake oil product but did it anyways because the client was willing to insist and pay for it.

[@oswaldjh]

Calyo Delphi. This product quickly became a regular production run for us and I had to watch hundreds of these things leave each week. I made a personal choice not to be part of the scam and left.

[@calyodelphi124]

I stand corrected, then! Yeah, good choice there to go somewhere else.

[@EEVblog2]

Wow, thanks for sharing!

[@ferencszabo3504]

@@calyodelphi124 this happens in all industries. For the Money, everything is possible. Without any shame, at the end if a TV shop type figure is persistent enough he can sell to the sheep masses everything. It's just disgusting...

[@station240]

Thanks Dave for the explanation on the bifiler wound inductor, never seen one wound this way.

[@SpaceSquid420]

“Grey Beard Nude Virgins” did not put a pleasant image in my head lol.

[@nikolaosstavrou5327]

HAPPY NEW YEAR and all the spare parts we can use!

[@LiLi-or2gm]

Dude, the so-called "woo-woo" coils are constructed such that they couple to the radiant Yum Yum Field of Happiness. Duh!

[@byronbeasley642]

Laura Harris females are too scatterbrained and stupid to understand electronics. It should be an international crime for a female to be allowed within 150 ft of any electrical device that contains more than a single transistor and operates on more than 1 AAA battery

[@byronbeasley642]

Laura Harris even an AM radio is beyond your worth

[@marianoaldogaston]

I searched more about the ODrive thing. and in some video I saw how those motor replace stepper motors in some pen plotter. is like a SERVO. and is really fast. please do a follow up. this thing must be really great to update china cnc desktop machines or to make a robotic arm really fast as an industrial one.

[@Sekeletu]

Man, BLDC servos are on the market for ever. It's everything but a novelty. They've been replaced by AC brushless synchronic servo motors like 15 years ago, bacause they're worse in every aspect. That ODrive thing could possibly replace some stepper or servo-stepper applications, but only in hobby business. Noone in industry would ever be interested in that thing.

[@marianoaldogaston]

I understand that, but this being open hardware seems great yo me

[@robn2497]

I was thinking of making something like this its cool idea but the backlash in the video is a bit sloppy for precision controll.

[@illustriouschin]

Yeah slop is a killer.

[@matterrend2802]

Rob N I wouldn't call that movement backlash, it's the result of overcoming the holding torque of the motor, then the servo loop detecting the error and compensating. System tuning has a large effect on this type of error, and is typically minimized after the load is characterized. In this case, the loop gain is probably quite low and there will be longer settling times as a result. This system also has a pretty low accuracy encoder so takes a greater change in angular position for the system to detect, measure, and correct than if the system had a higher precision encoder. Some servo systems I encounter now have 32 million pulses per revolution, compared to the ~2000 pulses per revolution of this system.

[@Kaeltis]

From the thumbnail I first thought someone sent Dave some old toast.

[@JohnStewart-fs3wz]

Yes it is a spark gap. In my sixties vintage multimeter it is for overvoltage protection.

[@rgbj60]

The oscillator looks like a giant version of the isolated USB A.

[@maevebaksa]

ravi60 that’s exactly what I was going to comment!

[@aaronbrandenburg2441]

@@maevebaksa ditto.

[@kwindzy]

41:44 now, that's some new physics out there about bifilar wound resistors. Dave, your phrase "inductance cancels out itself but it still has the property of storing and releasing a magnetic field" should be immortalized in some textbook. :D

[@Graham_Langley]

Seems a counter-wound inductor is known as a Caduceus or Smith coil by the 'free energy' lot and apparently has mysterious properties.

[@DonkeyLearningIT]

That "protection" device does have a sacrificial element : *sacrifice respect for engineers...*

[@johnfrancisdoe1563]

Donkey Learning IT If it's job was to "prevent corrosion protection", it would certainly do a nice job by being in the way and generating currents.

[@spodula]

Now now, i bet you the bit underneath where the module is mounted wont rust at all. Of course, thats probably because its got a great big useless plastic module covering it...

[@station240]

sacrificial element : Your money!

[@fernandgeenevan8773]

The sacrificial elements are the anodes in the car battery! In real life, active anodes against corrosion are there. However, to design them to be used on cars will be a big problem, since you have to deal with things like possible shorts and drainage of your battery; on ocean liners, that's no problem.

[@strangersound]

The inductor segment is gold. You should do a fundamentals based on that part. :)

[@Nigel_Broatch]

42:00 That bifilar inductor cannot work, a bifilar inductor must have 2 windings (correct me if I'm wrong!).

[@tomgeorge3726]

Hi Dave, if you look at the bag of fittings, you will find there is a spider shaped fitting. It probably bolts to the holes in the end of the motor opposite end to the encoder. The propeller nacelle then bolts on with it, The encoder has to be there all the time, otherwise it would not be a precision servo. I service some older type servos with resolver type feedback and they are priced in the thousands of dollars for 3Kw controllers, serious accel and deccel with high inertia loads.

[@jamesnewman9547]

I missed this. Those encoders aren't aligned to any windings in the three phase motors. The motor controller has to know where the motor poles are in reference to the encoder. This can be accomplished with hall-effect sensors, so the motor can operate somewhat and then as soon as a hall effect changes polarity, the exact optimal value is known. It can be accomplished by having the encoder mate to the servo shaft in only one way (like red-cap fanuc servos and their encoders). Or you can just activate a pole, and pull the rotor it, recording the position. This only works if it's acceptable to move the motors a ways either direction before having torque. So on some machines, this may not be acceptable. (Vertical axis that have to resist a load on startup for example)

[@AlmightyDemon]

Finaly someone send something from Bulgaria. Greeting from BG, Dave. Love your channel. Keep up the great work !!!

[@electronash]

3:02 Nice to see a lot of people using the CH340 and other USB UART chips over FTDI now. I'm sure FTDI are doing just fine, but they shot themselves in the foot with their "self-bricking" driver update. It was meant to cut down on the fake FTDI chips of course, but it made people steer clear of even the genuine chips as a consequence.

[@yalgret]

ElectronAsh ch340 arduino nano atmel boards are soooo cheap, I've seen some for 99cents from China!

[@SianaGearz]

"NICE" There's nothing nice about CH340G! Except the price, they are dirt cheap. I do think everybody should switch from FTDI and Prolific proprietary protocols and to something more standard, but CH340G is not the solution! SiLabs are so much less problematic. Also current Prolific chips are CDC compliant, and Microchip and Cypress are also suitable suppliers.

[@electronash]

Siana Gearz Yes, "other chips are available" also. But, the CH340 has worked perfectly for me and many others for months now. A simple USB UART shouldn't be a complex thing, but FTDI put lots of people off when they released their "bricking" drivers. Dave even did a video about it IIRC, and I'm sure others agree with my opinion. I don't normally condone people using the "cheaper" or even fake chips, but releasing those drivers wasn't the best way to clamp down on things. Right or wrong, it meant that thousands of unsuspecting people suddenly found that their Arduino project or 3D printer could no longer talk to their PC after upgrading to the latest FTDI drivers. That's never a good business practice, even if those chips were fake. (even more so since it's not at all uncommon to find a certain percentage of fake chips / transistors being sold unknowingly by the reputable sellers.)

[@electronash]

Siana Gearz I had lots of issues with the common Prolific chips btw. Drivers causing BSOD on both Windows 7 and 10 (x86 and x64). Not saying they are all bad either, but it's just my experience. Whatever works well for each person, I guess.

[@SianaGearz]

Most Prolific chips you get nowadays are TERRIBLE fakes. I wouldn't recommend getting them. This is why i recommend SiLabs, they're good. For me, CH340G turned out to be prone to problems, it doesn't synchronise very well, not as well as SiLabs, and the "2 MBit's" spec is a complete and utter farce, i mean yeah you could, but really you couldn't. It's not the worst chip, but why would you want to cheap out on an adapter that you're gonna sell for $15 a pop? Silabs though, you can push them, and it's fine, they easily do what it says on the tin, they're much more reliable than CH340G, and they aren't all that expensive either, CP2014 is just $1.50, not FTDI prices or anything. Prolific and FTDI are widely faked, and it's their OWN DAMN FAULT. This is because as USB CDC protocol was already standardised, both decided not to be compatible with them but push their proprietary drivers, which in turn left Microsoft without a hardware partner to implement a CDC driver against, which is why we didn't get a working one before Vista/7. They both tried to create vendor lock-in by ignoring existing standards, and this is why a different manufacturer couldn't compete with them at a level playing field, but would have to resort to faking their ICs instead.

[@bestbattle]

Hello from Romania, Dave! Glad to see co-nationals sending you stuff :)

[@meteor8076]

Do you know where can I buy uradmonitors ?

[@ats89117]

The last device looks like an amateurish attempt at Impressed Current Cathodic Protection (ICCP), a system used to protect submarines and other large vessels from corrosion. This works a lot better than a sacrificial anode, but requires a sophisticated controller to ensure that the current isn't too low (resulting in corrosion), or too high (resulting in the high yield strength steel becoming brittle). The coils are there to inductively couple to the frame. As an aside, this system is probably responsible for the new spray coating acoustic coating on the US submarines falling off, because it results in the formation of sodium hydroxide forming between the coating and the hull (due to electrolysis of seawater).

[@alfoncejean8826]

ats89117 2 thing -brittle steel from induction curent??? wtf are you using your hull has an cooking plate or what? -an anti electolisis device that actually give you electrolisis.. please explain because I'm not convinced with your curent explanation.

[@ats89117]

@Alfonce I could link to hundreds of papers on ICCP, but you can go to Wiki: en.wikipedia.org/wiki/Cathodic_protection From Wiki: "Production of hydrogen A side effect of improperly applied cathodic protection is the production of atomic hydrogen,[42] leading to its absorption in the protected metal and subsequent hydrogen embrittlement of welds and materials with high hardness. Under normal conditions, the atomic hydrogen will combine at the metal surface to create hydrogen gas, which cannot penetrate the metal. Hydrogen atoms, however, are small enough to pass through the crystalline steel structure, and lead in some cases to hydrogen embrittlement." Hydrogen embrittlement is a serious concern for submarines which use High Yield (e.g. HY-80) steel. The hydrogen is an unavoidable byproduct of current flow through salt water... @mcgherkinstudios As you probably know, it's not only a serious problem, but a very embarrassing one as well, with multi-billion dollar submarines coming back looking raggedy with huge panels of coating flapping around and causing lots of noise in the process! They've been working on a solution for years, and they keep saying they've solved the problem, but it seems they still haven't solved the problem...

[@ats89117]

You're right, of course. And even if they look good coming back, if they stay at the pier for any length of time in warm water with lots of sun, all kinds of stuff will be growing on them because the anti-fouling paints are only effective when they are underway, and sometimes not even then...

[@jaro6985]

The coils can't be for inductive coupling, as they connect directly to the spring and then the metal contact on the outside. The voltage is also DC at that point, as it has to be for ICCP to work. So most likely it just looks cool. Good points otherwise.

[@ats89117]

Yeah, it's certainly not properly implemented, but there's no obvious reason that ICCP wouldn't work on a car. The use of Hot-Dip Galvanized (HDG) steel has solved most of the problems from the 70s and earlier, but it might make sense in climates where they use a lot of salt on the roads...

[@Orbis92]

It is really nice to have this removable front at 27:40 with the screw terminals, because in an industrial environment you just "hot" swap the base if it fails, keeping all the wiring and labeling of the unit intact.

[@Graham_Langley]

Many, many years ago I used to design security electronics including control panels. We were the first to use plug-on terminal blocks for panel PCBs which made it a lot easier for installers to swap them out after if needed. It was mainly window dressing as they rarely failed, lightning strikes being the usual cause of death.

[@BMRStudio]

I have this VU meter from more than 2 years, and it’s working fine and dandy! I installed into a monitor controller :)

[@ChipGuy]

25:30 That is in fact a spark gap overvoltage protection device. Looks like this one is for telecom stuff.

[@DonkeyLearningIT]

Yeah, that is a spark gap. Old Russian TVs were full of those things...

[@Peter_S_]

I saw tons of those gaps on modems in the days when 2400bps was unthinkably fast.

[@3800S1]

I have seen them in old TVs as well.

[@cambridgemart2075]

Just bought some of those! In my case it's to repair the HT supply of a Tektronix spectrum analyser.

[@Graham_Langley]

Very surprised Dave didn't know what it was - or maybe not. There used to be one of these in every British Telecom phone installation at the connector where the incoming cable terminated.

[@mikeselectricstuff]

Odrive - so stupid when people don't include standalone demo functionality - if you're sending someone something for publicity, you don't want to have to make them do work to get it to work..

[@ODriveRobotics]

Yes I was considering making it spin around on startup, but I thought it could be unsafe. Maybe I should just have trusted that the clamping instructions would be sufficient. I will make the demo completely self-contained next time.

[@josuelservin2409]

Interesting project, I find the demo with the arduino in your channel: kzbin.info/www/bejne/fn65maukqJJglZY Hope you can post a comprehensive and a bit more extensive video demoing the fuctionality.

[@DonkeyLearningIT]

I have the same remark for many large open software projects from GitHub. If people put hundreds of hours to write the software, *why* did they not spend 30 minutes to provide a couple working examples and a minimal documentation...

[@onjofilms]

Don't worry dude, you got a lot of publicity anyway. I'm checking it out now, looks very promising. Keep up the good work.

[@JGnLAU8OAWF6]

If project doesn't have proper documentation - it is probably not good at all.

[@guthmang]

What happened to the non-Kickstarter orders from the store for the meter? I was one of the lucky Patrons who snuck in there and ordered one. Still no show, but charged over a month ago :-(

[@johnclawed]

BUT HOW does the bifilar inductor store and release a magnetic field if the field cancels out itself?

[@lasersbee]

25:17... Yup.. It's a spark gap. 34:46... I would assume the encoder needs to stay on for robotics position accuracy. 35:09... The propeller adapter is used as an output shaft and is installed on the motor case opposite of the encoder.

[@BogdanSerban]

Romanian fan here! So proud to see something made in my country, congrats!

[@bikinihaulsell_bikinis3125]

You are wrong about the sacrificial rust protector. Normally you have some aluminum to rust off at sea, to put the steel body of a ship under a negative or positive bias charge. This prevents chemical reactions between the steel and the salty water (because that requires either some electrons being donated or taken from the ship's steel). It seems this device tries to create a charge bias in the car so that if road salt water sparys on it in the winter that won't be able to react with the steel of the car. As a car is on rubber it can be charged positive or negative we know because we got shocked often..

[@AntiProtonBoy]

Yep thats a spark gap. I seen them in electronic gas stove ignition systems. From memory, they have very specific breakdown voltages.

[@ThaVoodoo1]

The assman Dag-100 , I can remember removing racks of equipment back in the late 90's from telecom telephone exchanges with that in it.

[@RyanUptonInnovator]

The electro shield may work by causing the protective metal to retain a negtive charge. If a metal is negatively charged then it wont rust. The negative charge can be done electrically, the circuit in the video, or chemically with a metal that is sacrifical anode.

[@fgbhrl4907]

Hi Dave, quick crystal question for you: If you exposed a non-sealed crystal to rapid pressure changes, can you cause it to "stick" / fail to oscillate temporarily? (Ie, going from vacuum to normal pressure and vice versa)

[@ChrisMaclachlan]

Dave, I suspect the Magna Card stuff might be the control board for an old magnetic stored-value card system for a photocopier or something like that. It certainly fits the form factor and age.

[@jaxativejax662]

Over a thousand videos, how do you have time for anything else and is that dagger have a +1 versus boxes or is it all down to your proficiency? Love your work mate, I wish I had some of my old electronics to send you It would've been great to have seen a teardown on my old commodore sx-64.

[@Nordic_Mechanic]

the daggers doesnt add anything. BUT He has australian racial perks adding +15 knive wielding and +10 Crocodile mastery

[@jaxativejax662]

Nah, mate, as an Aussie I can assure you that all you need to have your way with a crocodile is an appropriately sized cable tie and I know that Dave has the required proficiency for that.

[@michaelterrell]

The SX64 deserves to live, not be torn to shreds. I still have two of them in my collection.

[@seemeknowme]

Try placing that spark gap next to the GM tube in the environment monitoring system. Some of them have trace amounts of radioactive elements such as Nickel 63 or Cobalt 60 to improve their ionization characteristics.

[@chuckvanderbildt]

I wouldn't mind a second look at that brushless motor controller, it looks quite interesting.

[@brianjrichman]

I just knew you were going to say "stability" regarding that Crystal. Awesome.

[@yakacm]

New videos from Cody's lab and EEVBlog virtually at the same time, Christmas has come early, lol.

[@ceneblock]

diecast jam *late* Christmas is late, but atleast it isn't canceled.

[@ManofCulture]

*NEW YEAR*

[@Ard-War]

No, this is next year's Christmas come early

[@Questchaun]

That Cody dude gonna kill himself one day.

[@Beng177]

I may be wrong but you can easily have those motor spin the wrong way, since the motor can be wired up any way they will just spin in one direction or the other. I reckon it only spins a tiny amount just to find which ways which.

[@quantumleap359]

Dave, that innocent looking "choke" is really a over-unity "hairpin coil!! You can power your lab with it and never spend another red cent for utility power!! Don't believe me? Check out the crackpot er er knowledgeable tutorials on Rube Tube!! Happy New Year!

[@mikeselectricstuff]

Eprom(s) probably on boards plugged into those empty 41612 connectors in the back

[@EEVblog2]

Yes, has to be external somewhere

[@silviomatthes]

mikeselectricstuff o

[@RVProject]

Actually, these days, modern marine outboard systems have active cathode systems to prevent corrosion. Yes, the old zinc or magnesium anodes are still used for base model outdrives, but Mercury Engines has an active system called "Mercathode" that has been around for decades, and Volvo Penta has an "Active Cathode" system that is similar.

[@rjrfletcher2355]

Anodic or Cathodic impressed current protection won't work on a car unless it is fully submerged in water ! which is a little impractical ! (This is not sacrificial anodic protection)

[@firstsurname9893]

Interestingly two manufacturers of such devices were ordered to stop selling them in the very state that is home to EEVblog. Details at www.finance.nsw.gov.au/about-us/media-releases/no-rust-bust-warning-re-car-rust-reduction-devices

[@coilsmoke2286]

I believe the rust inhibitor is a 'Tesla ' coil like field generator designed to keep the car body at an electrical (positive?) potential above that of the atmosphere. This may prevent normal oxidative stress between the vehicle and environment...

[@Build_the_Future]

Please revisit this and maybe walk through the software setup or build something with it. I would love to learn more from

[@repawnd1]

I have an old "rust inhibitor" that has 2 aluminum plates, are those the sacrificial parts? Or is mine also snake oil? It's also about 20 years old.

[@codebeat4192]

New year? One day and some ours to go. Happy 2018 Dave and everyone.

[@GadgetBoy]

I'm sure this question has been asked before, but I'm new here. What's with the humongous knife?

[@bluerizlagirl]

The part shown at about 25'20" looks a bit like a gas discharge tube suppressor, as used in telephone circuits. Also used in gas ignition controls: if the secondary side of the ignition transformer is earthed by means of one of these devices, rather than directly, then the ignition electrode can also be used for sensing the flame (fire conducts electricity! It's a chemical reaction, so there will be plenty of charged particles present, some of which we can co-opt for our own purposes .....)

[@bradnoyes7955]

2400 pulses/rotation might be fine for hobby use but the industrial servos I just installed are 4 Million pulse/rotation. That's part of the reason they cost >$1000/axis (for motor and driver amp)

[@fabimre]

Hi Dave, About the Electro Shield: My guwss is that the "Sacrificial Anodes" are the little knobs that stick out of the boxes. If they really did anything, the would, depending on rhe climate, be eaten up within a couple of months. Boats use large blocks of Zinc which last for years! (without electronics!)

[@Pentross]

The Electro Shield looks like it’s making a circuit through your car bodywork/chassis or resonating or something just so the LED turns on only when the pads are put on and woo-woo coil is just a needlessly fancy wire for the spring-loaded contact pin. As for the sacrificial anode, maybe they’re trying to corrode your battery instead of the bodywork?? Don’t know enough about sacrificial anodes to know whether it would prevent rust at all but no matter what this is probably just meant to wreck your car battery faster. There’s also a good chance those rods inside are magnesium, so it’s just a super extravagant flashy version of a normal sacrificial anode.

[@AintBigAintClever]

The LED circuit is separate to the anode driver circuit, hence the bar down the middle of the schematic. You could remove the anodes and both voltage regulators feeding them and the LEDs would still flash away happily.

[@DavidLeeMenefee]

Happy New Year!...PEACE thumbs up

[@toddberg3892]

30:00 If you hold it at the proper angle you'll see the primer! Happy New Year!

[@GRBtutorials]

And when do you plan on continuing the custom LCD series? I'm finding it very interesting. BTW, speaking of custom parts, how could you design and order a custom keypad?

[@aaronbrandenburg2441]

Just saw a video on that in my recommendations today by the way.

[@Skwisgar2322]

Dave, I imagine you mount whatever you want the motor to drive to the end you were spinning in an "outrunner" configuration.

[@nowhitespace]

Yay! Romania and Bulgarian devices in one episode :)

[@jelleverest]

Reckon the motor encoder is a one time thing, to get the motor constant and the armature resistance and stuff. What I does is first runs a known current through it at various speeds to get the armature resistance, and with that you can calculate motor constant Kphi. Those two things help with simulation a lot.

[@wetmelon]

The current encoder calibration routine measures resistance and inductance, then moves back and forth to figure out what the encoder / electric phase offset is. BUT, you need to keep the encoder on the motor if you want accurate position control. There is a separate anticogging calibration that it can run to generate a feedforward term to reduce low-speed cogging. It can also run sensorless (in development) for speed or current control only.

[@redtails]

How much for that uRad Environmental Monitor ? Looks like a sexy toy for serious measurements

[@monkeyflyer410]

Yep, I do like that, potentially very handy. As for the encoder being taken off, it can't be, a servo is just an electric motor without an encoder.

[@Landrew0]

The "Old Dart" of course refers to Dartmouth and the River Dart in Devon England, where Royal Navy sailors sailed from and returned.

[@meteor8076]

Where can I buy uradmonitors ?? The official site contains just information, there is no "Buy" button :-(

[@uemang]

wondering the same thing

[@thefero8]

You gotta write an email/message to the developer - last time I looked at it. It’s written on the website.

[@bluerizlagirl]

That logo is a bit off-putting, though ..... It reminds me of the Grim Reaper's scythe blade!

[@iulianispas8634]

bluerizlagirl it measures radiation lv as well not only polution and have some hazard parts inside (mercury and radium )

[@jburdman7]

A huge soldering iron is called a "blow torch."

[@Sixta16]

What so surprising about the SIL 3 em. stops? The sHITANO capacitor? Or the crusty construction? Does anybody know? Huh,,,

[@toolthoughts]

the magna card is apparently some sort of interface/communication add on for magnetic card reader-writer devices

[@dh2032]

first time I hard this 18:59 "formaldehyde" do you get a lot of that in the air ? does it do "carbon dioxide" e.g. like gas fires etc. (smoke alarms) it would be good if did, is it , up a grade of say a smoke alarm or gaga counter, etc, could you trust it to keep you safe, from what it detecting 100%

[@coilsmoke2286]

Formaldehyde is a common environmental toxin given off by many manufactured products.....

[@dardosordi]

Please Dave, to a fundamentals about coils, I think its a feared subject but its also very interesting.

[@bbreeuwer4577]

About that ODrive driver board. Take some more time about the thermal design. The heatsinks don't do that much on the top side, since the thermal pads are on the bottom. Therefore you can't run full power. Common mistake for young players.

[@GadgetReviewVideos]

I’m surprised you didn’t recognize that arm processor. Most RC quad, planes these days in the flight controllers are using the ST Arm MicroProcessor, the STM32F405. I think you said then121GW uses a ST microprocessor and assuming it will be an ARM based ST chip since that’s what ST is good at these days among other things. The crypto wallet with the secure clad encrypted portion on the chip architecture you recently tore down also using a ST chip and probably ARM based architecture as well. This STM32F405 is well knows in the RC community and commonly found in flight controllers and RC radios as well. If you do any kind of firmware based arm microprocessor programmable hardware you probably own a few ST programmers as well as other types like AVR atmel programmers for firmware changes, boot loaded changes, and flashing. I think even my LED flashlights use atmel chips for the firmware, but ST chips are becoming more popular then AVR atmel these days and have been for a while.

[@scottfirman]

I was most excited at the motor controller, just for the RC equipment. Throw in the Whoo Whoo device with flashy bits,add a plane body, a nd those remote control units, and you are all set for some RC fun I think.lol. I remember some of that gimicky stuff being advertized late nights on the MTV Channels. Late night cable tv used to push some of the worse crap ever. Sad part is, people bought it. The ones I KNEW wouldnt work were the buy one get one just for the cost of shipping, oh yeah, then you knew you were getting screwed.

[@seamonkeys12y]

That environment module was basically what I wanted to build, until I found out how much work it. Was talking to so many different modules

[@oetken007]

25:25 Yes, it is a spark gap. This kind I have seen some times in telecommunication applications on linecards and extension cards.

[@nathanielbest3541]

Happy New Year Dave. Tried to reach ya as I was in Sydney last week (Bondi Beach). Awesome country Mate, but the taxes...ugh!!

[@mikewillis1592]

You had a really nice frequency standard there Dave. I would have kept it and done some comparisons against a GPS reference if it was working first rather than destroy it straight away. The older they are the more stable they are and that one was good for parts per billion. Mind you, it's not a double ovened one so not metrology standard. I would say its late 1970s or early 1980s.

[@randycarter2001]

The electronics need to know the phase angle between the north pole and the coils. This so the motor can be spun the way you want. To see it in operation search KZbin for "ODrive Liteplacer - 250W test". This is a very powerfull unit.

[@iGrave]

@Dave, that last item is not necessarily bullshit. Sacrificial anodes are used for galvanic protection, but are only capable of providing a limited area of protection. Instead that looks like it's using what's called Impressed Current Cathodic Protection (ICCP). Corrosion is basically electron movement. Galvanic protection relies on metals with a higher electron mobility to provide electrons preferentially to the metal being protected. ICCP skips the metal middle man, and provides the electrons directly from a power supply. I'm not saying that device is actually effective, but the principal of operation is actually correct. en.m.wikipedia.org/wiki/Cathodic_protection

[@alfoncejean8826]

Ben Bowmer but rust is a chemical reactions! anonodes wont help a car ... Ho and yeah your car will be rusted to shit before you will ever see any trace of corosion.

[@bigcheese781]

And battery will be flatterer more oftenerer... =O

[@iGrave]

"rusted to shit before you see corrosion". Not sure what to say to that. Yea battery will flatten. Nothing comes for free. Either costs you car battery, or zinc. Dave was wondering where the sacrificial element was, in this case it's the battery itself. I'm not saying this device is useful, but dismissing it outright is somewhat ignorant. The mechanics of corrosion are known, and we do understand how to prevent it. If you understand how galvanic protection works it's not a big leap to get to ICCP.

[@RWoody1995]

How is it ignorant?, did you look at it? its basically just a couple of LED's plugged into your battery... plus, he was sent it by a guy who made a thorough debunking of it anyway lol

[@iGrave]

Ok, full disclosure: I love a good debunking as much as the next guy, there are plenty of shill products out there and they deserve to be ridiculed and pointed out for the frauds that they are. I also have not watched the other debunking video, and don't really plan to. I have a basic understanding of the principles of corrosion, enough to know the main methods of prevention used by industry. (for reference, they are exclusion, i.e., wrapping the metal in an oxygen impermeable membrane, galvanic protection and ICCP.) Listening to Dave review this, he knows about galvanic protection, however it's clear he is not aware of ICCP, with comments like "There's no sacrificial element", "It's basically just connecting the power [to the chassis of the vehicle]", "How is this going to do jack all, hooking a battery up to your car", "I don't get it, if you can explain how this works .. leave it in the comments" I'm definitely not the person to describe how ICCP works, however I am aware of its existence. From my understanding of the process, this product should not be immediately dismissed as 'woo woo'. Instead there is a clear mechanism for its operation, and is currently in use in industry to protect large metal assets where the maintenance costs of inspecting and replacing sacrificial galvanic protection would be prohibitive, or where the sacrificial anodes simply cannot supply the current required to sustain the corrosion reaction. From Wiki, ref /wiki/Cathodic_protection: _"Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell.[1] A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes instead of the protected metal. *For structures such as long pipelines, where passive galvanic cathodic protection is not adequate, an external DC electrical power source is used to provide sufficient current.*"_

[@aaronbrandenburg2441]

Hey eevblog AKA Dave Jones. The tape you're referring to is duct taped the stuff we called Gaffers tape here in the United States. Would actually be very similar to duct tape but is non-reflective black. Very expensive compared to steroid duct tape. And a slightly different materials depending on your application and who makes it Etc. Why I'm familiar with Gaffers tape cuz I used to work on stage crew off to high school. The only time we use true Gaffers tape is where it had to be non-reflective it was too expensive to use it for anything else.

[@MatthewSuffidy]

I thought I'd take a little detective on the magna card thing. What I found out is 'Oy Suomen Tietokehitys ab' is a Finnish company that is described as: Use and management of data processing and hardware. It may/may not have something to do with a Caribbean credit card of some sort.

[@network_king]

Do they still use oven oscolators? I can't imagine knowing computers, etc don't even use them.

[@bigcheese781]

That "Magna card", isn't that the display board from one of them old coin phones from a phone booth? Quick tip: Rub the LCD on your bangs a couple of swipes and it'll lit up random segments. That'll show if it has any phone symbol or specific marker indicating its application. It's known in the business as "the comb" technique...

[@robertgaines-tulsa]

Are you trying to piss off my Texan neighbors to my south with your huge knife? Texan: We do things BIG here in Texas! Australian: Ain't that cute!

[@petehiggins33]

I had to look up goniometer to find out what it was. Now I'm wondering why you would want to combine an angle measuring instrument with a VU meter.

[@keantoken6433]

Earthquake or foundation shift detection?

[@JLSoftware]

Regarding the rust preventer, what's it supposed to do and why doesn't it do it?

[@nlr70]

Great Dave have a Happy New Year you and the family

[@bentboybbz]

@ 44:07 saw one of these on my sisters car. The car has no rust. But i highly doubt its because of that device. As always Mailbag is great Mailbag is good.

[@johnkarkoska6963]

Where does a person get such an efficient package opener? Tried Staples here in the USA but no luck.

[@sparkyuiop]

What does "faired income" (I probably spelt that wrong) mean or translate to? I always wondered.

[@Graham_Langley]

It's 'fair dinkum'. I'll leave it to you to look up its meaning.

[@sparkyuiop]

Actually you'll probably be surprised yourself. Thanks for the spelling. www.phrases.org.uk/meanings/fair-dinkum.html

[@rickgoebel6724]

You just have to love them "woo-woo" coils. For a moment I thought they were contraceptive I.U.D. stuck on the boards.

[@jeffmassey4860]

Dave:Recommend to send the WooWoo rust preventer to BigD Wiz for a dyno-test! LMFAO! Glad ya saved the best 4 last!Merry New Year,and Thanks for all the Fish!

[@maverickbna]

Hey Dave, love the new EEVBlog ident. :)