Fairly Easy - Frequency Counter - Electronic Kit Build (part 3)

[@raymondheath7668]

I love the detail you go into when you work with something. You give a lot of detail I wouldn't have thought of when you go off on your rabbit trails

[@Edisson.]

Hi, I really enjoyed your video, I bought this kit to make a display unit for an HP audio oscillator, I didn't think for a second about testing the crystals - I do this with a simple shielded fixture, an oscilloscope and a generator. Since the kit is on the way I couldn't do the analysis like you and I'm glad for it, I will convert the crystal testing circuit to an input amplifier. Thanks for the inspiration, I don't need to finish the input amplifier outside the board. Nice day 🙂 Tom

[@GadgetUK164]

That was brilliant - I love the attention to detail in your videos! I bought one of these following part 2 of this series, and now I know that its worth ditching the XTAL tester in favour of a pre-amp. One thing that would help with the XTAL tester is to feed the supply line to the tester circuit directly from the 5v regulated supply.

[@scriptguru8]

I bet you're right. I've used a bench power supply (fed + and - directly to the pins next to IN pin) and the crystal tester worked very well.

[@jerrys9426]

Have made this kit up with a mod to have the BF199 preamp in place of the xtal oscillator. It seems to work ok as far as I can see. Had to cut a few tracks and make a few links on the back so the board doesnt look quite as nice as it did but it is a lot more useful! I used a 0.01uF coupling capacitor in the base circuit. A value for that doesnt appear to be mentioned in Wolf's notes. Edit: Ive changed the cap to 0.1uF and it might be worth going up to 1.0uF for measuring low frequencies (tens of Hz). Have also powered the preamp from the regulated 5v supply rather than directly from the power input

[@rodneyjaygarrett]

excellent content, excellent presentation. I watch you now instead of Discover Channel. As I have become older I have developed a strong attachment for hobby electronics and you inspire me to keep learning. Thanks again.

[@alanpowell328]

When I get mine I will replace the crystal tester with the pre-amp circuit. Many thanks for the heads-up Julian.

[@MsTonyhunt]

Julian, if you strapped the freezer can down with a couple of tie-wraps & I sent you an r/c servo you could depress the freezer button with a P.W.M. output of another PIC........... Sorry. Must go. Men in white coats at the door.

[@ljprep6250]

Rube Goldberg to the rescue, wot? LOL

[@gwesco]

I built the same kit but left out the crystal checker components. I had to go back and put in the 102 and 22 pf caps because it was so sensitive that it was picking up the 60 Hz AC in my shop. Those two caps are basically in series across the input. Once I did that it indicated 0 with no input. I built it to check the rtc oscillators in a couple of clocks that always seem to gain time. I suspect the crystal oscillators are running fast. Many years ago I built a giant nixie clock with a 20 MHz oscillator for the timebase. It always gained time but when I added a padder capacitor to the timebase, I was able to adjust it to exactly 20 MHz and it kept correct time from then on so yes, you can tweak the frequency of a crystal ocsillator a bit.

[@tonysansom]

Thank you for this excellent set of videos. Have learned a lot from them and may well get myself one of these counters for validating outputs from 555/556s, etc.

[@jchirtz6055]

Hi Julian, I built this kit some month ago and basically had the same issues as you with the crystal measurement circuit. Anyway the circuit as designed cannot work properly with a supply ranging from 5 to 9V, and for all crystal frequencies. As you said, input signal is directly fit to the PIC. So signals over some 5.5V will kill the PIC, not to speak about dozens of volts; they just might leave a crater in the middle of the PIC!I added an input stage and manage to measure frequencies from some Hertz to 40MHz ranging from ~1V to 18V. I have no means to generate a signal over 40Mhz / 18V! But that’s more than enough for what I need the frequency meter. Thanks a lot for your channel and your teaching skills. Cheers from France

[@anotherdave5107]

jc hirtz - I was troubleshooting the crystal problem and found that the 5volt regulator starts "motorboating" (rapidly turning on and off) at about 7 volts. I replaced it with a 78L05 ( which does NOT have the same pinout ) by rearranging the pins and the crystal section is now quite stable.

[@gordonlawrence3537]

I'm pretty sure the crystal is being massively over-driven. That and temp-coefficients of the transistor (which over drive it even more when hot) could be driving it into harmonics, which in turn make it give up and stop. Also the caps are what you would expect if driving the crystal from a microcontroller etc not a single bipolar transistor, so are not matched either, so the phase angles are going to be wrong. TBH i'm a bit surprised it works at all.

[@stevesm2010]

Looking at the crystal checker/pre-amp circuits, it shouldn't be too difficult to build the mod in. A couple of links and ommiting components etc. I think I'll leave that part of the circuit out when I build my kit and add the pre-amp afterwards. I've really enjoyed all three vids in this series, nice one Julian.

[@SpeccyMan]

I've changed my mind about getting one of these kits. My DMM will do frequency to 10MHz and my DDS generator also has a frequency counter to 100MHz so not much sense in getting one really. Update on my Alice order - finally arrived today, 10/01/2017, dispatched 10/11/2016 so exactly 2 months to arrive. Can't see why it took so long but I suspect RM are to blame rather than China post. RM are in my bad books for another failure. I ordered my PIC development board from Farnell yesterday and RM, instead of ringing my doorbell this morning (I was in), left one of their "something for you" cards so I gotta go pick it up myself tomorrow (I have mobility issues and I do not drive so I could really do without the hassle in this cold weather!) They will be getting a piece of my mind when I do pick it up. ;-)

[@hobbyelectronics7600]

I believe Christmas i part to blame. The orders from past two months has been incredibly slow, taking over 2 months to arrive or more if they ever get here...

[@williamsquires3070]

I suspect that the "crystal tester" portion would work better, and be more stable, if you add a 74HCT14 hex Schmidt Trigger inverter as a buffer from the output of the BJT, and the PIC input. Now you can take the scope probe off the output of the. 74HCT14 and it won't load down the "crystal tester" portion.

[@pirateman1966]

More voltage Scotty. I'm giving it all she's got Captain. :) When I was designing PIC circuits, I seem to remember that I had to change one of the 22pF caps to 20pF for reliable startups.

[@AdamWelchUK]

Superb explanation Julian thank you. Extremely interesting idea to modify the crystal section to a pre amp too. Can't wait for mine to arrive now so I can play with it. Shame I bought some different value crystals to test though!

[@paulsengupta971]

One chap in the comments says it works fine as a crystal tester, just don't leave it on for too long!

[@sebastian19745]

The schematic for the oscillator seems very close to one that I remember having seen in a Elektor book (300 Circuits or 301 or something like that). I am not sure about the values but the schematic was the same (as long as I remember correctly). It was a crystal oscillator circuit to test the quartz crystals. They suggested another stage after it that acted as a detector with an LED as indicator that is oscillating and the output of the oscillator they suggested that can be read by a frequency meter to see the frequency.

[@scriptguru8]

For me the crystal tester was 65 kHz off, but then I found that by pressing the button (which you've not soldered in), and selecting Zero option (when no crystal is connected) makes the device "zero" itself, and starting from that point my crystal measurements were spot on. Also I found that it completely ignores crystals of certain frequencies, such as 6 MHz, 4 MHz and 32.768 MHz. I guess it's a technical limitation. Otherwise, cool little device and actually useful (I bought it as a crystal meter, and it works very well - for frequency counting I have enough scopes). I'm powering it with a 9v bench power supply.

[@warplanner8852]

Wolfgang Büsch's original documentation or another video re this unit describes the 4 MHz "dropout" you mention and provides a remedy. Sorry not to be so precise but I remember seeing that. Will repost if I run across it.

[@GadgetReviewVideos]

That switch also allows you to set the auto timeout power off when running on a battery, or constant on as it sits default.

[@standishgeezer]

Give it a break Julian. That kit is only about £5 and actually reads crystals just fine (I've checked and verified hundreds in the 18 months I've had it). OK the oscillator drifts with temperature change but hey, you only check the crystal briefly, not leave it in there (or hit it with a hairdryer/freeze spray) for temperature to make a difference. I think calling the crystal checking part crap is over the top for a £5 device which does the job in normal circumstances. Just my opinion.

[@anotherdave5107]

standishgeezer - run it off of a 6vdc ps and the crystal tester works fine. I tested it on 6-32Mhz xtals. Most of the problems he was having can be traced to the crappy 7550A regulator dying at 7 vdc.

[@Samuel-km5yf]

If a tester cannot reliably measure what it is intended to measure, then it is most indeed crap.

[@larryb.lindsay2366]

great vid. I ordered one of those and now I know what to expect. It will serve my needs quite well

[@lloydgarland4667]

Thanks for the great review Julian, I've just ordered one of those kits from eBay

[@glauciogv5225]

Nice work Julian, good tests !

[@Kennynva]

I use the small screw driver that they give you with a set of oscilloscope probes, that adjust that small variable cap inside your probe..it is the same style cap as on your device.

[@k6rocket1]

Great job on the build and review. Are you now going to make fourth video showing how the circuit can be improved for the crystal checking circuit. It would be great if you can.

[@paullamerton2400]

I bought this kit it works perfectly, for the few pounds it cost it's value for money.

[@mrtom64]

"FREEZE SPRAY!"....we'll have to call you "GRU-Lian" from now on. Excellent vid as always, thanks.

[@ledted3275]

If you haven't already something easy to try for the temperature instability might be to replace the 1K in the Colpitts with a 2.2K.

[@bharatshetty9560]

Excellent!!! Very well explained. Thanks a heap for this wonderful video presentation.

[@TheDefpom]

That temperature issue will be the capacitors, ceramics are especially sensitive to temperatures

[@oldtimeengineer26]

I may do one of theses but I have a big project/build coming up. Nice build

[@goosegoose3359]

I know I am 2 years late, But for those who work on this kit now - just connect the far left leg to your low voltage signal source- with no modification to the circuit- it will work fine as preamplifier ! Just don’t forget the ground..

[@nkp5845]

Great video. How about making the improvements ? The signal pre-amp and also a better oscillator to test crystals?

[@reg2590]

I second that Julian. I have one of these kits on the way, so a follow up 'improvements' video would be great.

[@cheetahkid]

I was looking at this circuit, need a slight modified to it. www.electronics-tutorials.ws/oscillator/osc31.gif?81223b . On second thought I buy the kit and I hope I modify to see it work plus it does need a buffer.

[@davidhollfelder9940]

As shown, the xtal osc has several issues with temp drift, starting with the disc capacitors being notorious for value-temp drift .. See TheHWcave mod to replace/convert the xtal tester to a preamp that allows a lower input level of about 1.5 mV P-P (significant increase in sensitivity) when using 8V power supply.

[@DavidSmith-pm9dq]

Julian - will you be doing a "shopping" list video ahead of the pic tutorials? Bits could then be ordered and delivered so tutorials can then be followed as you release them. If items are cheaper from the far east they could take a while to arrive!

[@JulianIlett]

Yes. I'll make a 'pre' video with shopping list, PCB mods and justifications for using an obsolete MPLAB IDE.

[@arnab_blue]

Thanks a lot.... I recently bought this... First I thought my all 8Mhz Crystals are bad... But Then, like your suggestion I've use 68pF cap. (47pF doesn't works on mine)... Only detect "MHz" crystals. And, my 7550 got damaged, replaced with 78L05... Now works on 9 volt smoothly...

[@SuperLoops]

Ive ordered some kits to build from ebay I cant wait to make them my arms been in a cast but it comes off in a few days and I will be able to do stuff again

[@Taran72]

The best video on the freuquency counter!! YOU ARE THE BEST!!!! You really do a thorough review highlitign all the characteristics. The question I had (and that you answered) was: What is the max voltage I can apply to the frequecy counter's pins without blowing up the PIC? and that would be 5V. Thanks! :)

[@richolson1907]

There should be a push switch to the right of the adjustable capacitor... That's what the 4 holes are for.

[@ClaudiupromotionSRL]

I smile a lot in this video..nice vid Julain Keep uploading!

[@warialinth]

Best way to fix that xtal tester: 1. Unpopulate it's components. 2. Leave it that way. 3. Forget about it. ;) 4. DONE!

[@Anvilshock]

Step 5, fix that apostrophe in "its".

[@anotherdave5107]

Take out the 5vdc regulator and replace it with a 78L05 with the leads rearranged to be the same as a old part

[@TekkGnostic]

For the price it looks like it'd be a cheap alternative to a scope for my purposes, it'd be nicer if it were more compact without the crystal tester... it's easy enough to hookup the actual circuit you'll be using and use the frequency counter to measure and I'm sure more accurate.

[@ljprep6250]

I paid a whopping $3.49 for my copy, and I think I have a 47pf cap for the mod somewhere. The XF2206 sig gen with case cost $5.89 from BangGood. I'm sure Clive would cheer you on for your torture testing of the little crystal circuit, though. LOL

[@MrPinkster1]

great video, looking forward to the pic tutorials

[@CliveChamberlain946]

The youtube user HWCave has done a number of videos on modifying this kit including making the front-end more sensitive and mods to the firmware to improve measurements and to add functionality. Changing the hardware: kzbin.info/www/bejne/ZnPboYCja7h_pac Changing the firmware: kzbin.info/www/bejne/bqOydKCehbx_jdk Improving resolution and adding RPM mode: kzbin.info/www/bejne/ZnWZdpadibanhNk Using the RPM mode: kzbin.info/www/bejne/h52sp2R6eqaph9k Adding up-counting: kzbin.info/www/bejne/aZrQdqOjlN-tqrM

[@MichaelBeeny]

As the crystal tester circuit probably only uses a mA or two, could you not connect this to the stabilized 5 volt regulator? Those trimmer caps ARE dreadful, I have two on a oscilloscope kit, both of which I have also broken. Still not managed to turn these trimmers.

[@mambovipirafiki]

hello fellow dso138 owner!

[@peterfielden-weston7560]

So, counter - surprisingly accurate; xtal curcuit crap. Nice evaluation. Thank you.

[@Tocsin-Bang]

The oscillator would be better if the base emmitter capacitor were increased to 100pF and if the oscillator were fed from the 5V supply, as you say, probably with a 470 resistor and a 1nF between collector and ground. I used the original 4 digit version for a transceiver.

[@Roy_Tellason]

I have one of these, have had it for a while. I usually run it off a 9V battery. It came with that connector and not the one that the board is ready to mount. I thought that it would be handy to be able to test some of the unmarked crystals that I've salvaged, but results have been mixed. Some of them give a reading, some don't. Trying a bunch out of a bag of colorburst crystals and others (3.579545 MHz and 14.31818 MHz), I get very mixed results there, too, with some giving what appears to be the correct reading and some reading zero or some other number that's in no way related to the marked frequency. Perhaps I'll try some of the mods suggested in the comments here...

[@Uplinkpr0]

They have another version of this with a case on ebay. I wonder if its any better?

[@markusfuller]

oops been watching your videos for a long time and just realised im not even subscribed to you. here goes (subscribed) thanks Julian I have learned a lot from you.

[@JulianIlett]

Thanks Markus - I like to keep an eye on what you're doing too. Love your mix of audio, music and electronics.

[@markusfuller]

Thanks Julian. much appreciated.

[@kfishy]

They could've avoided all the hassle of the oscillator by using a single CMOS gate and a bias resistor. And it's not even gonna be all that more expensive.

[@CornishMiner]

You might find that you'll be able to view the xtal oscillator on the scope if you use the 10X setting on the probe/scope. Usually a much higher impedance and less likely to stop the oscillator, but as you say, a rather inappropriate and crude circuit in many ways. Be interested to see if your suggested pre-amp mod is successful. Best wishes.

[@donaldfilbert4832]

If you modify the Crystal checker to be a pre-amp for the Freq counter - don't you risk overloading the input to the PIC? It seems you'd also have to have some added circuitry as a way of limiting the input voltage to the PIC??

[@jerrys9426]

Very interesting set of videos, thanks Julian! Have ordered one of these. Intentions are to use just as a frequency counter so very interested in the mod to convert the oscillator to a preamp, is that something you might do a further video on?

[@NoName-bt3oy]

You do have the probe set to x10 for measuring the xtal? The higher impedance helps not load it down.

[@gromett]

Thanks Julian. Interesting and answered my questions...

[@gromett]

I am actually tempted to recreate this using an Atmega328 and an i2c OLED display I have lying around.

[@NivagSwerdna]

I think you should have a pre-video and then 2 months later have the build video. That way we can play along at home after the slow boat from China has arrived. I've just received my PIC board.

[@dl8cy]

Many thanks to thanx to you for that video and DL5YHF for the original design. What do you think about the open hardware label?

[@Derricky007]

I have the tester/counter since a few days. The tester is pretty precise, even on 9V. I tested several crystals on it. Pretty accurate. My actual problem or question is : Is this counter able to measure the frequency directly on desktop/laptop motherboards ? I was not able to get it to work. I soldered 2 wires, one on the input pad, the other one on the minus pad on the counter section. I tried it out on some motherboards, and it does not work. Of course the motherboards were powered on, and all crystals are getting power and voltage. So, is it possible to bring it to work without a modification ?

[@Derricky007]

I found out, that a cheap kit like this probably can measure or better said count just some lower frequencies in circuit. To measure in circuit motherboard crystals, just a decently expensive oscilloscope or a much more professional counter can do the job.

[@nor4277]

Does it have Any use for working on old tube radios

[@محمدالبصراويالعراقي-و1ن]

Hello possible help me in solving a problem for the DVR SPY CAMER sunglasses

[@tinmachine722]

Hello ...you can send me firmware of pic 16F628a ?

[@herminigildojakosalem8664]

I ordered a kit exactly like this from China and its on its way so watching these you tube videos about it (such as yours) are so useful in that I might pick up some hints and tips on building and using it. So, please tell me, sir, what is the variable capacitor for? is there a need to fine tune the kit? Is that what is the variable capacitor for? Thank you.

[@Szocool]

Hi, How do you get into program mode? Pressing me the button resets the PIC, connections to the 4,5 pins are Ok. (I want to disable the power saving mode) Thanks, in advance

[@akarshagarwal4516]

if this build made 3 parts then what would oscilloscope kit do? :p

[@JulianIlett]

The oscilloscope kit is more advanced, so I'll leave out all the component identification/orientation stuff.

[@mrjohhhnnnyyy5797]

+Julian Ilett I like that idea. I'm sure that vast majority of your audience are people that already know that stuff. Yeah, beginners would like that, but you already mentioned it in the previous videos, I see no need to include that stuff in every kit build. The final choice is up to you, people sub to you because they like your style of videos, keep it the same and the crowd will be happy :) Just my 5 cents

[@DantalionNl]

the frequency measurements of a oscilloscope are almost always done in software which interprets the current shown waveform to determine the frequency. The kit uses and actual hardware comparison in which it can count a amount of cycles in a given time frame. The result is that the kit would be more accurate then most decent oscilloscopes.

[@DantalionNl]

@Nige Cook yes the PIC uses a hardware based comparator where as the oscilloscope evaluates a waveform stored in memory. This evaluation is done with a processor most of the time, thus a software comparison. Although versions of oscilloscopes with a FPGA and hardware comparison exist but it is unlikely such a cheap oscilloscope uses that. Most commonly oscilloscopes with these features are called 'mixed domain' oscilloscopes.

[@a1fliema1fie]

probe in x10? perhaps the capacitance in the probe is affecting it?

[@raykiii]

I am a ham operator and I am very interested in a crystal tester. Operating outside the frequencies permitted by ( in my case ) the FCC is frowned upon. Which crystal tester do you recommend?

[@lauej]

Why do you think the crystal tester is awful? Because it seems to read fine without the oscilloscope?

[@iceberg789]

you can rewire the oscillator +V to the regulator +V.

[@claudiaolivares2185]

Hi, thanks for your videos. I write for help. A few days ago my frequency counter arrived but it does not work, I insert the glass but there is no reading and sometimes strange numbers are seen. Compare this kit with that of another seller and noted that the only difference is the type of LED. The one that does not work has common anode LEDs and the other is a common cathode, I read on the creator's page that sometimes the copies come with the wrong LED type. Is it possible that by having the wrong type of LED your can see the letters of the menu but when the measurements are done they are not displayed properly? I exchanged the PIC with another kit and I still have the same problem, will the transistors be? I hope someone can help me because I am not an expert. Regards

[@KnaufL]

will we see more of the Vocoder?

[@JulianIlett]

Most definitely :)

[@guruji243]

Dear Julian how can I measure hi voltage as 240v with this? Thks.

[@nelsonchai7]

Good demo, Thank you.

[@dalenassar9152]

At about timestamp 9:50, you say the board can only operate at about a "5v SQUARE-WAVE oscillation". Is this accurate? I can see that it may need a high level input voltage, but does it really have to be SQUARE? What about something--say a 25% duty cycle rectangular wave? Thanks.

[@leorusnac]

I like these daily videos. Keep it up :)

[@champstyl]

i couldn't stop laughing this has a game build in :,D "Keep the Frequenzy stable" fun for the whole family.

[@chrismcaleer8549]

Just finished building one of these. Testing has been interesting. Xtal tester seems stable but gives wrong results. After much frustration it dawned on me that it is displaying exactly the correct value divided by 3. Maybe a corrupted pic?

[@JulianIlett]

Very unlikely to be a corrupted PIC - much more likely to be the Colpitts crystal tester circuit.

[@Tocsin-Bang]

These crystals are in fact 1/3 overtone. Their natural resonant frequency is one third of the marked frequency.The meter is actually correct.

[@i-will-get-you-there]

Thanks for the video, Have you consider checking out LED grow lights premade vs selfmade? Cheers mate!

[@paulsengupta971]

See Big Clive's channel for that sort of thing.

[@DupczacyBawol]

If the xtal tester circuit is bad, then why and how shoud the good be like?

[@jhonklk]

Can I put a 12 volts input signal so that I can measure the frequency of that signal using this little kit? In other words, what is the highest voltage I could use with this kit? (May I use 12V)

[@jhonklk]

Prashanth Nayak You are right. I could use this kit correctly by introducing a 4 volts peak-peak signal and it worked perfectly well. Thanks for your reply.

[@chrisg5633]

Is it possible to build this kit leaving out the crystal tester section components?

[@JulianIlett]

Yes, they're entirely separate :)

[@peterjones3245]

The 'scope will load the measurement somewhat but in the context of us amateur DIYers - of no consequence1

[@KevinDay]

You were using a 10x probe on the scope... right?

[@robinvince616]

Perhaps adding a supply decoupling capacitor to the Xtal tester would tame it.

[@gerhardposch9538]

Can somebody please send me the firmware-software of the PIC? I killed or erased it, thanks

[@Ncky]

How much does it cost? Can you give me link where you bought form?

[@EDToasty]

this was from his latest postbag episode

[@Ncky]

thanks :D :D, i didnt watched it

[@planker]

maybe a 358 and Pwr pigtail hat/shield thing that plugs into the pin header, amplification and power plug and play. Good show, yes the thing sucks. Three extra 22p and a resistor. Your right about it being a Ham creation. It could be usefull for the original purpose, without the xtal part.

[@barrygreengrass3379]

Hi Julian, where did you get the Tes3 power bank from?

[@ibrahimmenacer1357]

hello can you send me some capacitor variable its not avaiable in my country

[@joruss]

You can make a screwdriver out of toothpick to tune this cap.

[@Anvilshock]

You could adjust it with a hydraulic press; after all, this crystal tester is extremely dangerous and could attack at any time.

[@philipcross1586]

that would be a video i would watch.

[@anotherdave5107]

The crystal oscillator not starting at 7.5 vdc has nothing to do with the oscillator design. The 7550A regulator is a piece of crap and turns on an off rapidly (" motorboating ") at about 7 volts. I replaced it with a 78L05 (which has a different pinout) by rearranging the pins and the crystal tester works fine for a $3 piece of test gear. Not to imply it will test from 1Hz to 50Mhz. Or you can just use a 6vdc power supply.

[@sjurick]

Where can I purchase the kit used in this video please?

[@-yeme-]

ebay, search for "50MHz frequency counter diy kit"

[@felixcat4346]

Too bad, because I bought this to use as a crystal tester. As a frequency counter, it doesn't seem to work with anything but square waves, thus it needs the preamplifier if you want to use it to detect rf signals. The far better circuit (but way more complicated) is the one Mr. Carlson built to modify an old radio using nixie tubes.

[@Davedarko]

you could try to add a Schmitt trigger to your schematics to turn sine and triangle waves to squarewaves

[@anotherdave5107]

You can use this as a crystal tester by using a 6 vdc ps or removing the 7550A voltage regulator and using a 78L05 ( they do NOT have the same pinout! ) With it's legs rearranged. The 7550A running at over about 6.5 vdc is erratic, rapidly switching on and off.

[@CliveChamberlain946]

Hi, youtube user HWCave has done a number of videos on modifying this kit including making the front-end more sensitive and mods to improve measurements and to add functionality. Changing the hardware: kzbin.info/www/bejne/ZnPboYCja7h_pac Changing the firmware: kzbin.info/www/bejne/bqOydKCehbx_jdk Improving resolution and adding RPM mode: kzbin.info/www/bejne/ZnWZdpadibanhNk Using the RPM mode: kzbin.info/www/bejne/h52sp2R6eqaph9k Adding up-counting: kzbin.info/www/bejne/aZrQdqOjlN-tqrM

[@mrjohhhnnnyyy5797]

What a weird PIC, my homemade AVR based counter has no trouble reading frequency of a square wave, sine wave, triangle, sawtooth. The only requirement is that the amplitude should be higher than 0.8V and less than 5V to prevent frying the chip's input.

[@motormadness9975]

almost 100 000 subs Julian !!!

[@PhilXavierSierraJones]

I went "PUT IN THE FREAKING BUTTON JULIAN IT IS CLEARLY A BUTTON FOR MEASURING FREQUENCY AAAAAARGH".

[@gwesco]

Actually it is to program the kit to allow you to add or subtract frequencies and also to turn on or off the power saving feature. Keep in mind, this was designed by a ham and by subtracting or adding the local oscillator frequency, it can show the actual receiving frequency and would make a great tuning display.

[@KARLLARK100]

Hello all way to advanced for me but cool vid julian,/.,/.,/. you still make my day

[@kose2ik]

the gas molecules absorb heat when they are released from the pressure from a balloon

[@Xfixiateher]

I dunno if 10min ago is still morning even in the UK? :P

[@ThatGuy-nv2wo]

~15:10