Make your own hand-cranked Emergency Powerbank

[@rpavlik1]

FYI, you could avoid the problem of overcharging by feeding the input to the DW01 protection chip instead of directly to the battery, since that's what it's designed for. (Saw this power bank has the classic DW01 with dual mosfet package arrangement for battery protection.)

[@Fungineers]

You..you have an assistant?

[@guymcphee2518]

i bet it's Miss Moneypenny

[@darksilverfast9307]

It's Electroboom, I can't be anybody else

[@guymcphee2518]

@@darksilverfast9307 oooh good guess, but the level practical skills we see here are far to advanced, id suggest its more likely ElectroCUTE hehe

[@janbottos7817]

​@@guymcphee2518 I get the pun, but Mehdi is hella cute #gayformehdi

[@guymcphee2518]

@@janbottos7817 i hope Mehdi see's these comments, im sure he will be more than flattered!

[@rtarade1]

Reminded me of Electroboom's handcranked charger

[@hackileo]

Very cool

[@jonny11bonk]

Yeah. When the mobile burnt.

[@amishpatel7794]

Lol i was just watching him

[@yoyo-xx9xz]

But he didnt destroy a phone. And didnt build a robot out of it.

[@DarshanKumar-mo4ew]

Why didn't you plug it here, NO!! BOOOOM!!!!!

[@burnmyuncle141]

Me: My wife helped me print 3D parts Man: Your wife is a engineer? Me: Nah... The 3D printer is my wife

[@nikokareno4156]

NICE

[@kewynf]

All we are is 3D printers 🎶

[@joshm264]

@@kewynf electroboom

[@stevetobias4890]

@@kewynf 3D-gasm

[@cw4608]

Burn My Uncle can’t wait to see the kids!

[@yasyasmarangoz3577]

it's cool to know that nearly everybody here is a GreatScott and ElectroBoom fan at the same time :D I am sure they will make a video together.

[@tyk6892]

Love the ingenuity! I've been storing all electronics parts over the past decade(3 laptops, numerous phones, digital cameras, and so on) looking for a worthy project, now I believe I've found one!

[@darkanzalipl]

Yeah, jlcpcb offers cheap pcb, but delivery costs are huge. For example: shipping to Poland costs $24.

[@ahsanwho9739]

Bro its urgent shipping actual standard shipping costs i think 7 to $9. By the way you can ask there customer service to give you 20$ off shipping coupon on first order. Thanks

[@darkanzalipl]

@@ahsanwho9739 unfortunately I cannot select "standard" shipping method. It's not available to Poland. :( I tried about 2 weeks ago.

[@ahsanwho9739]

@@darkanzalipl oh!

[@ahsanwho9739]

By the way there PCBs are awasome

[@MC-el5hp]

@@darkanzalipl I have ordered PCBs to Poland literally 2 weeks ago and paid 7$ for the shipping.

[@tecvictor1736]

Nice project ^^ But one thing: You could build in a bridge-rectifier direktly after the Motor/Generator, so its not important in witch direction you crank. Also, the Outputvoltage is lover, but the current is uneffected, so lower risk of overcharge the Battery :)

[@OmgMcGamez]

Great Scott: stay creative. EU: we don't do that here.

[@Relaxing137]

still a good one

[@Elmias]

Haven't watched your videos for a few months and the first thing I noticed is that your accent got signifficantly better!

[@AkraiLulerz]

May be a good idea to put a mechanism to maintain a constant angular speed in the generator in between every crank push (like a simple heavy flywheel )

[@BADALICE]

That was great. All those fun toys; that 3D printer sure comes in handy. I was reading some of the comments below, and it occured to me this device would be handy for those days when your on your way to work, or for some on your way home, and you suddenly get that impulse to say screw this, I'm going to go get lost somewhere; I'm just going to drive until I run out of money and gas, and can't walk any further.

[@SurvivalLilly]

Could you make a water turbine out of an old washing machine?

[@tobiastho9639]

Yes, i've seen it on KZbin...

[@patrickjdarrow]

Concise explanations like at 6:50 are extremely helpful. Keep it coming!

[@RobertMilesAI]

7:32 This is not an actual problem at all, but you may want to avoid that specific phrasing, as the main time you'd hear it is as the standard English translation of 'Endlösung'. Something like 'final design' works better here.

[@MATAM29]

He's german.

[@8bits59]

I can't be the only one who loves this guy's accent.

[@UpcycleElectronics]

Those are the nicest 3d printed designs I've seen on here before. The "assistant" shows here. It was obvious you got more done in a week/single upload than is typical for this channel's regular upload schedule. I have a suggestion for another 3d printed project like this. Do a resistor box. You could do the typical decade resistor box like every hobbyist should have, but I think there is a better first design that often gets overlooked. The first resistor box everyone should build is one that has each resistor value that they keep in stock. This device will save countless resistors from being lost or discarded while doing breadboard experiments. Decade resistors are great when a precision value is needed, but it isn't very useful if a person figures out they need a 5k9 resistor when all they have are 5k6 and 6k8 5% resistors. Sure they can parallel and serial several values to achieve their goals, but this is something for more intermediate level hobbyists. The first thing we should all build are resistor boxes with one of each value we keep in our personal stocks. IMO the best way to build that is to place them all on a custom circular PCB or 3d printed design and come up with a rotating switch solution like the dial of a multimeter with one position for each resistor. Personally I recommend getting a pack of 50 values of 5% resistors with 2500 resistors total from somewhere like AliExpress for around $12 shipped. This isn't a complete set of all 5% values but it is generally the best dollar value for a wide range of values and a great starting point. For a really good starting point, order the 50 values set, and 100 more pieces of 220R, 330R, and 470R to work as current limiting resistors around 5v and under with LEDs and such. Then order 100 more 100R, 1k, 10k, and 100k for a good starting collection. If you can spend a bit more, the halfway point between the 10's within the logarithmic scale 5% resistor values is "47" so order 100 more 470R, 4k7, 47k, 470k and you'll be setup really well. Also note, the 4 value bands of 5% resistors are much easier to learn to identify visually. You'll have all of the color bands memorized very quickly if you get these instead of the 5 color band 1% resistors. ...anyways.. I've been thinking about how I can etch my own little resistor boxes like this for my personal parts stock of resistors and capacitors. If I had a 3d printer I would probably create something that uses wire wrapping resistors for even more versatility. This is just one of those key tools to have a few of on the bench. The commercial products available are either a pain to use, are way over priced and/or have irrelevant values that don't match our stock on hand. It's a great project to build that often gets overlooked. -Jake

[@bardenegri21]

A good source of motors for this seems to be windscreen wiper motors. There are two kinds, you need the continuous spinning ones (some go one way a bit then reverse). They are low rpm geared 12v,perfect for this.

[@sipplix]

I made a similar device using 2 x 700farad 2.5v super capacitors in series to make 5v, and used a stepper motor as the generator. It was a 4 wire motor, I used two bridge rectifiers, one on each coil to change from AC to DC, connected in series to charge the super caps. I have since found stepper motors with planetary gearboxes already attached, which will make much better hand crank generators. You can use a little voltage boost circuit to keep a constant output voltage and get as much as possible out of the capacitors.👍

[@kamote6375]

For how long can it charge up your mobile phone sir?

[@sipplix]

joelo secretario, the super capacitors would fully charge my phone, but I am using them for lighting not for usb, although a step down dc buck or boost circuit could be used to maintain 5v to charge phones etc.

[@kamote6375]

How abt the supercaps? How long does it takes to be charged? Is it a crank gen?

[@sipplix]

joelo secretario, yes a hand crank generator, using a stepper motor, it takes about 3-4mins of cranking to charge the caps up, but they will sustain a bright 1w led for 12 hours.

[@kamote6375]

Im concerned with the small energy density of the supercaps. But with this application, it is way more time efficient to charge an SC rather than a li-ion battery considering the amount of effort you exert cranking the device.

[@y2ksw1]

Your English is becoming better! 😊

[@dharmeshsolanki4354]

you can use a gearbox for the BLDC motor 👍

[@NeonblueIndustries]

for everyone playing at home, Use a stepper motor. find the winding pairs put a bridge rectifier on each set and you get some seriously good power. I've found it best to charge up a super cap bank then take from that via a buck converter. Good for wind, hydro, pedal or hand crank.

[@real4487]

If I've to Keep my Power bank charged I can simply keep my phone charged -Electroboom

[@vertigo6982]

If you're watching this kind of video I doubt you skipped forward past his struggles. That's the best part.

[@richardamullens]

It is not fair to compare an ungeared BLDC motor with a geared DC motor. Also, what about using a stepper motor ? If you put the wires of common stepper motors in your mouth and spin them manually, it is obvious from the sensation that they generate quite a high voltage. Also, shorting the wires creates considerable resistance to motion - suggesting a low internal resistance. Of course a DC motor is the most obvious and simple solution, but it is not the most interesting in my opinion.

[@mich29sm]

I like your way of testing the generated voltage :)

[@batuhankaskaya2097]

yes, using a gearbox leads to waste some energy. I think using a stepper motor for this build is the right choice. You should just use some circuit to smooth the voltage you get from stepper motor. Because it will generate bursts and peaks of voltage and current. It may damage the battery if you charge it directly with the unstable voltage that the step motor gives. And you should install a voltage indicator for not overcharging the battery. or you can just use a powerbank with voltage indicator built in.

[@umerjamal4442]

Well in his other video he recommend the step up motor best to use as a generator

[@GRBtutorials]

Your assistant?! This is the first time I hear about your assistant!

[@janoschlolmann8822]

A DC-Load Project would be very nice to see ... (since those loads are rather expensive)

[@Orcristy]

The try and error are great, it shows how hard will be a project

[@themanwithIBS]

hey greatscott, can you make a video about breaking bad's galvanic cell battery that walter and jesse made when they killed the battery in the middle of the desert?

[@bassotalli6494]

Led lights whit battery made out of potatoes. It had two plates that you push to potato, one was copper and I dont remember what metal the other was. If I remeber correctly there was 10 potatoes in series.

[@themanwithIBS]

@@bassotalli6494 Copper and zinc stuck in a potato or lemon, but you cant make significant power with those, I wonder how much copper and zinc is needed for cranking a car, but I doubt that amount they used in BB is remotely enough

[@gayusschwulius8490]

@@themanwithIBS yes, absolutely. A potato battery produces around 1.5V, so putting 10 of them in series would actually achieve a voltage higher than the standard 12V car battery with maximum charge. The maximum current of such a battery, however, is around 10mA. To start a normal car, you need at least 100A, for a motorhome I'd guess nothing below 300A is realistic. So to start this camper, you'd actually need around 30000 packs of 10 potatoes each in parallel.

[@necoisidois7570]

Congratulations, you will be 1M in a month!

[@AtariKafa]

Damn 7 hour thats too much. We have to find a efficient and fast design. Because this is very good project.

[@oaksparoakspar3144]

The issue is size. Obviously, you could use a larger engine or increase the mechanical advantage (he already had to go with a gear boxed engine that was already using mechanical advantage to up the RPMS). Doing any of that, however, adds size and weight to the build and if you have the space/weight to haul such a thing, you could just carry a larger battery bank. If the renewability was your goal, they already have commercial rechargers that are built into bicycles that will, I believe, put a full charge on a phone in about a half hour's ride - letting you double duty it with exercise or commute.

[@raykent3211]

To take the proposed scenario literally, you're out in the woods, but within mobile reception and in urgent need of help. You've forgotten to pack your spare battery but have remembered to pack your wind up charger..... pull the other leg it's got bells on. If you're serious about using human power then use pedals, because thighs are much more powerful than arms. Machine not easily back-packable, though.

[@matijakukec4731]

I really think the gearbox he uses is too weak and too easy to crank. If wider rotor windings and bigger lever were to be built, I think this would be a decent increase. Not the best but decent. Cause he cranks it so fast it makes it look easy 🤷‍♂️

[@XInfinity2024]

I am trying to work on a proof of concept of this kind of video and its possible imo

[@JjMn1000]

ok?

[@jamesaseltine2756]

Super cool build man this guy deserves his own product line looks high quality

[@evmcg]

0:39 you could get a powerbank with better capacity so it could charge more things?

[@dfgaJK]

At the end of the vid, you see how big the whole setup is ..... you might as well just carry a car battery.

[@godofwinetits3826]

useful if your out camping for a long time

[@ayushwebmaster]

Even though I'm software engineer, I love your videos. Someday I'll build something with the knowledge i gained watching all your videos. 🙂

[@tejav1160]

(Phones battery is dangerous low) Me: Starts building a crankshaft generator with the help of 3D printer, Oscilloscope, etc........

[@mv746]

built it befor

[@clarke762]

As one does.

[@gelatinocyte6270]

Great Scott! Your handwriting is magnificent!

[@johnavonvincentius1884]

Can You Explain How A UPS Works and Maybe Build One?

[@greatscottlab]

It is on my to do list

[@Shenron557]

I look forward to it too.

[@gigigigiotto1673]

GreatScott! Yeah, that would be interesting. I need one because where I live, sometimes happen a blackout that turn off my computer when I’m rendering and piss me off. I need at least 400w

[@Kostanj42]

loooool i remember electroboom's video "powering stuff when there is a power outage"

[@vgamesx1]

@@gigigigiotto1673 Look on ebay, you can often find pretty good ones for next to nothing, sometimes people don't even know that the batteries need replacing and sometimes a business/recycling center will practically throw the things away, I picked up an apc smt1500 for just $50, those go for $400 new then I found a couple discounted batteries for $30 and it works a treat.

[@ColeAlexanderSoftware]

He wrote 6.6̅, including the overline meaning recursion. I'm proud of him!

[@gayusschwulius8490]

"There is a burglar in my house, my phone is dead and my power bank is empty, quick, let me just shortly crank my generator for a few minutes!"

[@user-dz2jv4in5z]

Did the burglar also turn off the power from your house?

[@ericscaillet2232]

That's allright, make sure you have designed a quiet mechanism 😉

[@macro312]

The handcrank powerbank. That is the best name, no other.

[@C0mmentC0p]

Thank you Scott, very cool.

[@prathikprashanth2932]

Jeromey Pascal is his name. I hope I spelt it right

[@FTBasic]

@@prathikprashanth2932 How did you know his name?

[@prathikprashanth2932]

@@FTBasic he mentioned it in one of his Q&A vids

[@C0mmentC0p]

I forgot I ever commented this.

[@snaj9989]

Once I bought a USB handcrank for 80 cents from Aliepress :D I opened it and there was a tiny motor with gears and a small 5v boost converter. That is so simple desing and it works well.

[@jordencarmi2486]

Why not charge a Super Capacitor and then boost its' voltage to 5v?

[@ameet4468]

Because he isn't dumb like you

[@jordencarmi2486]

@@ameet4468 can you explain. Im always open to learn

[@tomusklepipieta1009]

Because its a capacitor? xdd

[@ameet4468]

As super caps are usually low in voltage 2-2.5 volt you have to put them in series which isn't practical enough and there will be loss of power between charging and conversion too

[@TastyBagel]

@@jordencarmi2486 It would work just fine, but not as well as the solution in the video. First off, the boost converter is not 100% efficient so you would lose a bit of energy there. The other drawback is that the boost converter would have a minimum input voltage for it to start working. That means if the capacitor is at 0V, you would have to charge it up quite a bit before charging would begin.

[@papadalbo1997]

I really like this channel despite I not really understand what's going on

[@Alex0474]

2:15 Those are some really *T. H. I. C. C.* diodes!

[@shaunclarke04]

Alex 0474 ive got tons of them ones lol, never used one, doubt i will, (unless i build this)

[@runforitman]

This kind of thing would be quite good to keep in a bag as a backup emergency power source Think I might make my own version

[@ShaunDobbie]

BLDC would work far more effectively with a gearbox than the geared brushed system you used.

[@gigigigiotto1673]

Shaun Dobbie yeah, why he didn’t print a gearbox for the bldc motor?

[@SeanBZA]

@@gigigigiotto1673 printed gears are very poor material wise, you would need a 3D printer that uses metal powder to make one with any sort of life or power handling. ABS or PLA is not a structural material, though you can use it to make investment castings to pour actual brass, zinc or aluminium pieces.

[@michaelangeloonassis2427]

@@SeanBZA this is incorrect in my eyes. I 3d print gear boxes for my Robotics projects all the time using nylon x filament ( a mixture of nylon and carbon fiber) that is rediculously strong and can withstand alot of abuse. And in this case petg filament would be more than enough to print gears.

[@americanengineering2063]

for a simple hand crank PLA would even work for a gearbox. i was wondering why he modified a brushless motor.. redundant.. also i dont think his printer is tuned well enough to print gears lol. u see those prints?

[@michaelangeloonassis2427]

@@americanengineering2063 haha yea he needs to spend a while longer with mechanical and slicer tuning so his tolerances get better.

[@darkfur18]

You need to use a geared down BLDC motor. Remember that for a higher voltage, it has to be rotating faster.

[@brucejohnspeedster1626]

9:11 *We* created… Sounds like GreatScott has been playing around with symbiotes ;)

[@guymcphee2518]

My black&decker gsr12 passed peacefully today leaving a deep sadness to all that used him, i asked myself why is it the good ones are taken from us??? it seems the universe has other plans for this good soul, A FREEKIN GENERATOR!!! thus returning the equilibrium and the balance of life!

[@JuanTorres-uy9ru]

If I make one of these and a Stirling engine would I not have to crank it

[@NuclearRoll]

I love hearing him say "Gerber" it's like the modern equivalent of how the word "squirrel" was used to detect german spies.

[@JDtheEE]

Why did you not use a FULL BRIDGE RECTIFIER? Is there any reason for the one diode?

[@MathewPanicker1010]

the diode is only to prevent reverse polarity, not rectifying any AC

[@FreeOfFantasy]

That is a DC motor. The diode only prevents reverse polarity. If you use a rectifier you loser more voltage in the diodes.

[@gigigigiotto1673]

Not just a single puny diode

[@salvygonzy3600]

that one diode bugs my mind im thinking if his pulling ac theres a full bridges on the power bunks board i really dont get it??

[@serafincastilla]

I think it would work better with a full bridge instead a half wave (single diode), Maybe he used the single diode to keep the thins simple

[@Lazar-w9u]

You are back,yay!

[@zanpekosak2383]

Like I mentioned in a previus video. The best generator IMO is a microwave oven motor with a bridge rectifier and a regulator to make 5V of the incredibly crazy high 100-800V the motor can generate. Its a 4RPM notor.

[@raykent3211]

Sounds good. Have you considered making a video or are you hoping someone else will pick up on the idea?

[@zanpekosak2383]

@@raykent3211 My video editing skills are really low. I have tried to make a few vids before but they were all badly rated since I made them waaay to long and talked waaay to much. Im just not a presenter type of person. Im just giving out my thoughts here. Once I get a 3D printer than I can start to experiment with that thing.

[@deathpony698]

Other people have done it on YT im pretty sure

[@zdw306]

I'd still watch the video but just skip around after making note of important time stamps, and putting them into a comment to help others get to what they want to see

[@ngocbannguyen]

great assistant! he/she has the skill of 3d design

[@greatscottlab]

I will tell him that. Thanks for the feedback :-)

[@Cheese_1337]

*emergency coal*

[@Devin82m]

What is that super awesome looking USB tester you show at 3:15?! I want one!

[@1MCPepe]

Why not just add one of those small battery protections circuits in between? To take care of the overcharging problem?

[@greatscottlab]

Good idea

[@HElados77]

A Zener Diode might also already be sufficient, but would only solve the overcharge problem, on the other hand it might fit into the existing housing very easily ;)

[@samuelmessiha8609]

I’ve been actually wanting to make one for a while, thanks seriously

[@Nicksperiments]

8:39 you have an assistant? Are you hiring?

[@Kostanj42]

who knows, maybe it's his second brain. i mean he is a genius, it's possible....

[@itzbenz941]

Electro boom

[@jonny11bonk]

He created duplication. His mini. :D

[@peterwilson5528]

Great very useful for people living off the grid.

[@Kostanj42]

i just made myself a joule theif

[@guymcphee2518]

cool, me too! i used a 2N222A with a 200uh inductor, i lit 45 LED's that i assume are 3 parallel by 15 series. Bigclivedotcom is HIGHLY recommended as he is solely responsible for making the joule thief as well known as it is

[@Kostanj42]

@@guymcphee2518 i used about the same length of wire as bigclivedotcom, now i'm testing how long my 10 parallel leds will be lit. I slavaged wire, core and transistor from dead fluorescent lamp circuit.

[@guymcphee2518]

@@Kostanj42 top marks for the re-use of otherwise disposable electronics(guess who is about to venture head-first into my bins).

[@Kostanj42]

@@guymcphee2518 from 1,04V to 0,31V leds were lit for around 81 hours

[@lukasmayrwoeger1450]

Your videos are just the best

[@joshuahuman1]

You should start using fusion 360 its free and is much better that 123d design

[@England91]

Yeah but is subscription based so no fixed price

[@Nicksperiments]

Paul Banks unless you’re a student then it’s free

[@zanpekosak2383]

Its free only for students.

[@BaldurNorddahl]

@@zanpekosak2383 fusion 360 is free for hobby and start ups as well. Basically free for everyone until you make money.

[@MC-el5hp]

I think is's free up to $100k/year revenue

[@mindovermatter3988]

If you want to see what capillary action looks like with solder when it's wetting to a surface go to 6:35 and watch him solder the diode in place. It's very visible because it is going up the leg of the diode, Against Gravity. I've never been able to catch it until now.

[@venkateshg5186]

Explain how a li-ion battery charge in fast charge (Qualcomm quick charge) ... Now a days latest mobile phones are charging in 20-30 minutes.... How does it work...?

[@yosyp5905]

Basically a rush of current.

[@venkateshg5186]

Qualcomm 2.0 has three stages 5v,9v,12v At what percentage of battery which voltage is applied...?

[@yosyp5905]

@@venkateshg5186 I can't ask specifically, but when in low charge the battery accept a higher voltage, progressively turning it down while the battery takes the juice, up to a level when it becomes a normal charging. Batteries wear a lot when they reach full capacity while charging. I don't think I helped at all but it's all I know.

[@83hjf]

li-ion batteries are capable of charging very fast. you are only limited by the thin wire in your USB charger. at 5V 1A you get 5W of power, at 12V 1A you get 12V. in both cases you are passing only 1A (it's the "amps" that heat up the wires). the same as high voltage lines that power our houses. you get 120 or 220V but the power lines have 500kV or more.

[@venkateshg5186]

@@83hjf I understood the voltage thing , but I don't understand the current thing... If there is 5v for 3.7v battery i= (5-3.7)/resistance of wire, circuit take 1ohm. =(5-3.7)/1=1.3A At 12v i=(12-3.7)/1=8.3A But on charger it says 12v,1.66A How..!!....

[@farisdelic5493]

1M soon 🙏🙏

[@sharadkumarsingh8972]

Sir can you please make a video on UT6264 ram chip I love your channel

[@Redh0und]

what

[@Redh0und]

@@storage100 what do you expect him to do with that chip

[@England91]

@@Redh0und Eevblog is the best one to do one instead of this guy

[@picklerick814]

lets say it as it is. you love those XT60 female connectors

[@mupschiplayz1802]

Guess what im going to say.... hmmmm OUR GERMAN ENGINEER IS BACK WITH ANOTHER AWSEOME VIDEO!

[@pcpatel01]

You could add a voltage doubler, a buck converter and few capacitors, it hold the charge and needs less rpms to reach desired volts,

[@chrisp4671]

7:32 *Laughs in German*

[@thengspjo4716]

Lol

[@yetanotherdan]

I saw a prototype once that I'd like to see plans for: Basically, take a flywheel with spring loaded arms that maintain a constant rpm and wrap a string around a hub you mount to it. Wind up a string and attach a weight to the end such as a bucket with water, or similar weight and hang the contraption to your ceiling. As the weight lowers you harvest energy.

[@james10739]

I would have thought a gear box would have been the first thing you would do with the brushless motor before rewinding

[@raykent3211]

Yeah, as he explained, rewinding with more turns of thinner wire will inevitably reduce efficiency by way of increased resistance. Of course, adding a gear box also reduces efficiency, but he doesn't attempt to establish the trade off point. So the dismissal of bldc is wrong.

[@james10739]

Ya but the motor he used had a gear box built in so it is basically the same as adding a gearbox for a suitable rpm

[@vitsirucka6385]

Please make a bluetooth card as credit card but with arduino and bluetooth module. So it will fit inside a wallet and will turn it into an smart wallet. When the wallet goes out of range of the bluetooth signal, your phone will remind you that you forgot it or you are going to lose the wallet. Thanks :) Your videos are really good. :)

[@jonny11bonk]

I have an idea for the next project! I wanna tutorial for 3d printed vacuum cleaner that will be powerful with brushless motor. And with speed regulator. And INSANE TESTs what can suck and what can't suck.

[@greatscottlab]

Sounds....interesting. I put it on my to do list.

[@jonny11bonk]

@@greatscottlab Okay, Thank You! I found video where someone created a prototype of it: kzbin.info/www/bejne/oHezgIJ5bqiGrLs (not 3d printed) or kzbin.info/www/bejne/gInamqJolNeDmtk

[@Toxic_Temmie]

@@greatscottlab i think will be time consuming, but could compare with shitty usb powered ones or other mini vacuum cleaners

[@jonny11bonk]

@@Toxic_Temmie Yeah

[@zanpekosak2383]

Those cheap USB vacuum cleaners.... They attacc They protecc But most importantly... They succ

[@nikoladd]

You need gearing for the brushless motor too. I have a commercial flashlight/crank generator with brushless motor and 3 phase rectifier. It has gearing though. Cheapo build, but works.

[@KallulShivam]

Please make a wireless charger for phones

[@wazileiyjh]

The true free energy 😄

[@kinga.d9791]

Your phone need to smoke first

[@deeareus9886]

big hug from Spain, from infomario reus team :D. Nice work

[@horacewonghy]

If there’s is japan,my answer is ac plug in train

[@engelbert42]

Most long-range / high-speed / Intercity trains offer AC ports under the seat. Although I see more short range / regional trains equipped with AC and even USB ports on special seats beginning fielded were I live.

[@horacewonghy]

Allwyn S turn and pulg in

[@Alaakso]

If you are in nature and need to push more charge into the battery longer time, you could maybe connect that shaft into some kind of imperrel and use river flow as a force to turn the shaft.

[@adityar981]

*What if you use a Super-Capacitor in place of the Lithium battery*

[@Willy_Tepes]

Those old dynamos we used to have on our bicycles to power the lights, would be great to charge a phone while out riding.

[@EasyOne]

nice

[@Kostanj42]

nice

[@kaspey337]

You can also use an Stepper Motor e.g. like from the 3D Printer

[@gabesennheiser]

Winter is here, I am already having some trouble starting my car again. I have a bunch of batteries left over from when I used to vape they are all LG HG2's. Could you do a video on a DIY Lithium car battery, that can also be charged off the car? I love the detail orentated videos you make, and this kind of video cold be super helpful to people.

[@Zebra_Paw]

i made a 14000mAh powerbank, and this capacity has been calculated on the 5V USB output. in reality it is 14.8V 5.5Ah... i think your emergency charger is more a gadget than a really useful device...

[@lsudan2670]

scott...U NEVER FAIL TO IMPRESS US 😉😎👏 u're amazin' 🙌

[@OblivionTechYT]

This is what I was looking for so many days!!!

[@dickspider8393]

Cdda players loved this video

[@alexoja2918]

Please do a video on ideal diodes! Cheap modules, I'd love to see an analysis of their losses.

[@gilbertjose3467]

1M soon

[@fizzicist7678]

So he basically made his smartphone into an old school crank-phone, WELL DONE :D

[@greatscottlab]

Thanks

[@ThiasRussell]

Love the video :) What about taking it one step further and make it spring loaded so you can crank it up and it would rund for a few seconds maybe minutes charging slowly. Just an idea. Love you vids. Keep em coming. Thx for sharing. Regards. :)

[@userou-ig1ze]

you should convert the crank into a small water wheel. Put it in a creek over night, get fully charged battery!

[@PhermondRaj]

Nice description you are really a great scott I can clearly understand your problem and your solution

[@FizykaTV]

I thought that Graetz bridge is needed for that engine... I will try your solution 1n4002 diode + capacitor