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DIY High Voltage AC Power Supply

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  • Опубликовано: 15 авг 2024

Комментарии • 416

  • @Qwertyoneify
    @Qwertyoneify 8 лет назад +13

    I built one myself a while ago, with a capacitor from a microwave. Mine would throw out 30kv or so.
    Very dangerous, and amazing. Good video!

    • @ludicscience
      @ludicscience  8 лет назад

      +Nathan Boody Thanks!

    • @physicsandmathemathicssimp833
      @physicsandmathemathicssimp833 3 года назад +1

      i'd rather just use the microwave transformer then and add 2 capacitors in series to make it resonance . much better cuz high current and voltage . maybe even add a ballast

    • @ccmicro-ranchitoinsectnoti2482
      @ccmicro-ranchitoinsectnoti2482 2 года назад

      Diagram

    • @1islam1
      @1islam1 2 года назад

      @@physicsandmathemathicssimp833 ⚠️ God has said in the Quran:
      🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 )
      🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 )
      🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 )
      🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 )
      🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 )
      ⚠️ Quran

    • @eduardoedit787
      @eduardoedit787 Год назад

      how many volts needed in which it couldn't harm a person that holds the wire

  • @againstnationalismliarsand2615
    @againstnationalismliarsand2615 8 месяцев назад

    this is how it is explained so that everyone understands like a real professor..short and clear..well done.. it is dangerous without a transformer to separate 110 V from the electrical network ⚠️⚠️⚠️⚠️✍️

  • @ngok9063
    @ngok9063 3 месяца назад

    thank you so much much much ill recommend this channel to my friends and when ill win my science compitition i will give you 50 percent credit

  • @nigeladams8321
    @nigeladams8321 4 года назад +8

    You should really put a warning in the front of your video about devices like this being fatal instead of just at the bottom of the description

  • @skynjaydensdaddy
    @skynjaydensdaddy 5 лет назад +3

    I built one using multiple caps (about 150uf) & GM coil pack on a Jacobs ladder. The arc was approx the diameter of a pencil and
    a horse shoe size hoop at the top. It sounded like something from a Frankenstein movie

  • @tvtrompasdiegoyanto9550
    @tvtrompasdiegoyanto9550 5 лет назад +5

    For the voltage triplicate what value do you use on the capacitor and diode?

  • @stephencampbell1445
    @stephencampbell1445 6 лет назад +4

    cool, I built same thing about 25 years ago and connected to a voltage multiplier from old tv and got 3-inch sparks,easy way to get HV...

  • @joachimschreiber7835
    @joachimschreiber7835 2 года назад +1

    how would I build a really badass fence from one or more microwave transformers? they output 2kV AC anyway, dont they? and I dont need pulse. i want "touch & drop" perimeter defence style version...?

  • @kingyousef6117
    @kingyousef6117 6 лет назад +3

    Can I use 220v instead 110v to the ignition coil?

  • @GERCAS1128
    @GERCAS1128 5 лет назад +4

    Thanks bro! I've been looking for this informative video for too long, it's simple and easy to understand.

  • @leblancmeneses3650
    @leblancmeneses3650 4 года назад +2

    How about using a 120 volt to 12 volt transformer with just an on off switch? That would give me a 60 cycle pulse out of the ignition coil but is there something I am not considering I dont want to give my dogs a permanent smile. Should I use some kind of resistor to limit the current?

  • @EstjwabCom
    @EstjwabCom 7 лет назад +4

    this week I'll start doing one maybe with dual ignition coil, hope 1.5uf (630v) with 240vac mains will work.
    can't find 1uf or less around me.
    next week I'll get an oven.
    my goal comparing emp effect and distance from magnetron and high voltage.

    • @EstjwabCom
      @EstjwabCom 7 лет назад

      1kw magnetron showing distance over ignition coil in effecting calculator (reset) and light bulbs.
      did someone try it ? did i do something wrong ?

  • @BoiledKoolaid
    @BoiledKoolaid 4 года назад +2

    Just finished building this model and it works perfectly. Thank you for posting!

    • @adhesivemaser3469
      @adhesivemaser3469 2 года назад

      We’re did you get the light dimmer

    • @Sm0rezDev
      @Sm0rezDev Год назад +1

      add a higher capacitance and u will get far better arcs just dont exceed capacity of 25 uF or the coil will be smoked

    • @BoiledKoolaid
      @BoiledKoolaid Год назад

      @@adhesivemaser3469 Home Depot! But you could just order one online.

    • @iseeyou7622
      @iseeyou7622 Год назад

      @@BoiledKoolaid will any dimmer do?

    • @jakefriesenjake
      @jakefriesenjake Год назад

      @@BoiledKoolaid I got most of the stuff, did you do the triple voltage trick? What do you use?

  • @libertyrevolutionary1776
    @libertyrevolutionary1776 2 месяца назад

    I did this about 16 years ago... except i used a high voltage microwave capacitor. arcs were at least 8 inches long.

  • @Dubswitcher
    @Dubswitcher 8 лет назад +4

    Again you are very very welcome, enjoy the intro! I love helping out fellow RUclipsrs :D

  • @bataalexander9703
    @bataalexander9703 Год назад +3

    With a smaller capacitor, could this setup be used for a electric fence?

    • @Electronichub_05
      @Electronichub_05 5 месяцев назад

      It's not isolated from mains so it would probably be dangerous.

  • @risnusyuhada2237
    @risnusyuhada2237 6 лет назад +1

    can it be used to make ozone

  • @azadranya780
    @azadranya780 5 лет назад +2

    Please can I use a DC voltage only? Can I use Ac voltage for this
    ? I want an answer

    • @harms123
      @harms123 Год назад

      Don't experiment around this stuff if you don't know the basics.

  • @iblesbosuok
    @iblesbosuok 5 лет назад +1

    simple but useful idea. I can make ozone generator now.
    cheers from Indonesia

  • @aannttoniopereira
    @aannttoniopereira Месяц назад

    is it possible to generate low voltage wih high frequency? 1.2 volts above 3 mega hertz, is it possible for an inverter?

  • @eminusipi
    @eminusipi 8 лет назад +1

    Nice job. I think that your warning implies that it's only the high voltage that is dangerous. Any part of this circuit is capable of delivering a fatal shock with direct contact, primary or HV winding. At least 90ma on the primary and very close to that on the secondary on direct contact.

  • @snowballwhite3363
    @snowballwhite3363 6 месяцев назад

    from 3:40 towards the end can you pls provide listing of items and provide a schematic diagram. thank you bro

  • @vit8250
    @vit8250 Год назад +1

    What is the capacitor for?

    • @harms123
      @harms123 Год назад

      Limiting the current.

  • @claudeloi
    @claudeloi 4 года назад +1

    I know you are using 2 type of insulating media; one is .... ( please write it down because I did not understand) and the second one is paraffin. Why this mixture? Could you use melting glue? Thanks

    • @ElIsraelJijijiji
      @ElIsraelJijijiji 4 года назад

      50% Vaseline 50% Paraffin , i hope that helps you

    • @claudeloi
      @claudeloi 4 года назад

      @@ElIsraelJijijiji Thank you, sir.

    • @claudeloi
      @claudeloi 4 года назад

      @Isreal Gomez. Please give me some guidance to process the two compounds into that wonderful insulator. Again thanks

    • @ElIsraelJijijiji
      @ElIsraelJijijiji 4 года назад

      @@claudeloi just put a half of a regular soup spoon, and put it on a bottlr

    • @claudeloi
      @claudeloi 4 года назад

      @@ElIsraelJijijiji Paraffin is solid and vaseline is gel. How to melt and mix them at the time of use?

  • @geoffgeoff143
    @geoffgeoff143 Год назад

    How does flame rectification work?

  • @RFADICTOS
    @RFADICTOS 7 лет назад +3

    huy profe manuel achad no sabia que habla ingles que super,lo felicito good luck

  • @richievellalar3214
    @richievellalar3214 5 месяцев назад

    can i use this method to install on bike ?

  • @stevenwynne4041
    @stevenwynne4041 2 года назад

    I can only run mine for a few seconds before the coil gets too hot. Already had one coil blow up. Sprayed oil all over my shop. I'm using the exact same set-up. What am I doing wrong ?

  • @sospara
    @sospara 6 месяцев назад

    What can you actually use it for ?

  • @edgarnecaxa100
    @edgarnecaxa100 Год назад

    is the first voltage letal? i want to use it to electrify a storage room door, but i dont want to kill the thief

  • @Fleurlean4
    @Fleurlean4 8 лет назад +2

    New intro is great by the way!

    • @AYoutubeUser0
      @AYoutubeUser0 4 месяца назад

      wear headphone for better feelings... if you are alive.

  • @GaryMcKinnonUFO
    @GaryMcKinnonUFO Год назад

    I thought that the breakdown voltage for air is 30kV and that ignition coils are around 15-20kV, which would make sense with your 5mm arc length ?

  • @lopezstallon8449
    @lopezstallon8449 8 лет назад +1

    why do we need the dimmer?

    • @ludicscience
      @ludicscience  8 лет назад +1

      in order to chop the ac current and fed the coil with that kind of waveform

  • @vit8250
    @vit8250 Год назад

    I want to do this to a furnace that currently has a silicone nitride hot surface igniter. This should ignite the natural gas more reliably. What do you think?

  • @charlesmaverick-im8nd
    @charlesmaverick-im8nd 5 лет назад +1

    Bacana! Usar um dimmer pra pulsar, não tinha pensado nisso! Pena que você não explicou os valores dos diodos e capacitores de Alta Voltagem pra dobrar a tençâo AT

  • @kickcast7995
    @kickcast7995 3 года назад +1

    Hi Ludic Science, I am building a rat zapper that will utilizing your schematic and adding a PIR sensor switch at the 220V source plus an MCB as fuse. One question, If NEGATIVE coil terminal and the HIGH VOLTAGE terminal successfully zap a rat and the rat will stay there, do you thing the MCB fuse will trip down (due to shortage in the circuit)?
    I want the circuit to be automatically ON when PIR sensor catch a move, so it can zap multiple time per setup.
    Currently I am using mosquito zapper part to electrify the zapper, but I need to use 220v to 3.7V DC stepdown and currently it works great with small mouse. I want to build a little bigger zapper that will kill bigger rodent for continuous use. The circuit is use in our own property with enough security inside a barn.

  • @janfurstenberg4454
    @janfurstenberg4454 Год назад

    I think you can use this for an electric fence as well...I stead of using 12vDC you can use 12vAC

  • @paulrosario8572
    @paulrosario8572 Год назад

    What happens if you cut down the load from the house to try and get a lower voltage on output ,what is the amps

  • @rodylopez1795
    @rodylopez1795 5 лет назад

    Pregunta: pero la bobina de ignición la estás alimentando con la corriente de la casa? No debería de ser con una batería??? Osea con DC de entrada???

  • @waterfuel
    @waterfuel 7 лет назад

    Why not use vibrating relay with ignition coil , then add the multiplier for higher volts output DC? Primary turns on, then off .

  • @xNeuker
    @xNeuker 8 лет назад +2

    I need to ask: Does the dimmer need to be somewhat special, or can it be any dimmer? Thank you

    • @ludicscience
      @ludicscience  8 лет назад

      Normal dimmer for incandescente lights

  • @santiagoberon2789
    @santiagoberon2789 2 года назад

    Excelent, it's great!
    How to make, the same DIY High Voltage, but for 220v of ac Supply?

  • @robertblack4262
    @robertblack4262 4 года назад

    How is the current in a pulse start lighting ballast interrupted to create the high voltage pulses in the ignitor?

  • @xNeuker
    @xNeuker 8 лет назад

    JESUS man dat intro started playing when I didnt expect it.. And it scared the living shit out of me.. :D

    • @ludicscience
      @ludicscience  8 лет назад

      +Neuker nar Bohemia I´ll use a lower volume for the intro next video

    • @xNeuker
      @xNeuker 8 лет назад

      +Ludic Science Thank you..

  • @pj1
    @pj1 3 года назад +1

    this would be perfect for a bug zapper the rheostat can ajust the gap for the screens

  • @timtolar2115
    @timtolar2115 8 лет назад

    I am still learning I am 15 years old. So you are on good trac I am from slovenia

    • @ludicscience
      @ludicscience  8 лет назад

      +Tim Tolar I visited Ljubljana long time ago, very very beautiful city.

  • @mgamga
    @mgamga 3 года назад

    Mr. Ludic can we use the same circuit to power a flyback instead of the ignition coil?. Great video, Thumbs Up.

  • @DavidJordanGeek
    @DavidJordanGeek 8 лет назад +4

    Most cars run at 12V. Putting 120v @ 60Hz or 240v 13 amps @50 Hz as we have in Europe straight into an ignition coil sounds like a Bad Idea(tm) resulting in lots of magic smoke and possibly death. It would be much safer and efficient to drive this thing with a bench power supply or a car battery modulated to a few KHz. It only takes a few component which can be salvaged from scrap TVs

    • @problems-hf8ts
      @problems-hf8ts 8 лет назад +2

      +David Jordan He used a capacitor in series to limit the current. (i think)

  • @boonthipsuwansukho5891
    @boonthipsuwansukho5891 3 года назад

    🎉🎉🎉🙏..greeting ...before ending of your clip that ...what is it do you used to multiply to get the higher the voltage / current !!!
    Capacitor ??( the three white one !???).
    Thank you 🙏.

  • @user-sl5xw9wf1x
    @user-sl5xw9wf1x 9 месяцев назад

    Hi Ludic
    Would I get away with 20kv capacitors for the multiplier?.

  • @TechnoW1zard
    @TechnoW1zard 8 лет назад +1

    Is the output from the ignition coil the same 50 or 60 Hz as the AC power from the output? Or at a different frequency depending on the coil and capacitor, or dimmer?

    • @ludicscience
      @ludicscience  8 лет назад +1

      +TechnoWizard Same as line frequency

  • @lopezstallon8449
    @lopezstallon8449 8 лет назад +1

    i made with a motorcycle ignition coil and a ceiling fan regulator... but the Arc is small.... may i know why? ....i saw another video and the spark was a little bit bigger there

    • @ludicscience
      @ludicscience  8 лет назад

      ceiling fan regulator may be the culprit

    • @lopezstallon8449
      @lopezstallon8449 8 лет назад

      +Ludic Science may i know why?

    • @ludicscience
      @ludicscience  8 лет назад

      This circuit needs an SCR, that comes inside the dimmer, maybe your fan regulator uses other type of circuit.

  • @Zeemofree
    @Zeemofree 6 лет назад

    Ludic is it possible to power a slayer exciter with two electric motors? One spins the other to create an AC current that drives a primary coil?

  • @JavierGomez-yh6zb
    @JavierGomez-yh6zb 4 года назад

    Good video could explain to me what the operating principle is

  • @nirajdobariya9445
    @nirajdobariya9445 5 лет назад

    Last you connect voltage multi... But how can we make it. What's value of capacitor and diode

  • @flaplaya
    @flaplaya 3 года назад

    So simple I love it. Seems your circuit could be modified for way more output. I'm thinking spark gap and condenser could really make that baby zing

    • @eduardoedit787
      @eduardoedit787 Год назад

      yes it can be modify I think but using the flasher of cignal light of vehibles the current will not continues sparkling

    • @user-tl5xm3qj6x
      @user-tl5xm3qj6x 7 месяцев назад

      can i use 220 v instade of 110 v

  • @chithrag153
    @chithrag153 3 года назад

    can it use for fencing

  • @danburch9989
    @danburch9989 6 лет назад

    I'm going to try this with a 10 amp diode in series with the secondary of a 120vac to 12vac/10 amp transformer to turn the AC into 60 Hz pulsed DC. Polarity of the diode doesn't matter. At least try it to see if the diode blows. Coils like this are designed to operate with pulsing DC.

    • @jakefriesenjake
      @jakefriesenjake Год назад

      Depending on how long you use it probably. Just make a heavy duty ac to DC rectifier if you think it would be better

  • @melplishka5978
    @melplishka5978 Год назад

    Nice one. How hot did the coil get lol. Not really made for 120 acv mains.

  • @revscott58
    @revscott58 7 лет назад

    Doesn't the capacitor give the coil resonance at some high frequency, well above 50/60 hz.? Is anyone sure this circuit is still firing the coil secondary at 50 or 60hz.?

  • @mrinalthakur3459
    @mrinalthakur3459 8 лет назад +1

    Nice work as always

    • @ludicscience
      @ludicscience  8 лет назад

      +Mrinal Thakur Thanks

    • @mrinalthakur3459
      @mrinalthakur3459 8 лет назад

      +Ludic Science I have watched most of your videos if not all

  • @mohsenmousavi1364
    @mohsenmousavi1364 6 лет назад +1

    Hello
    Thanks you dear friend for your very nice videoes

  • @leopoldofernandezjr.508
    @leopoldofernandezjr.508 2 года назад

    Ur videos are very informative and we can make our own diy projects. But why you have no new uploaded videos ?? Who you'll upload soon 💐

  • @69iqtutorial
    @69iqtutorial 4 года назад

    Sir i made a hv transformer but when i plug it in the driver ... it makes nasty high frequency noises which decrease after i let the gap smaller andDlet arc

  • @carmelpule8493
    @carmelpule8493 2 года назад

    This is a capacitor discharge unit. It is an interesting system ho9w to operate the ignition coil.

  • @ubaidurrehman1027
    @ubaidurrehman1027 4 года назад

    Hello sir The motorbike can be used by ignition coil plz help mee

  • @niswanthskumar1608
    @niswanthskumar1608 4 года назад

    Can it be used for electric fence ??? Pls rply

  • @spartaeus
    @spartaeus 2 года назад

    Can that circuit be used as an electric fence charger to keep animals in ???

    • @ELFMEDIA
      @ELFMEDIA 2 года назад +1

      No, you need add transformer to isolate from mains

  • @zaidhussain5206
    @zaidhussain5206 8 лет назад +2

    Thank you so much , really inforamtive

  • @otiliorondon9275
    @otiliorondon9275 7 лет назад +1

    Excelente. Gracias desde Venezuela

  • @TechMastianaam
    @TechMastianaam 7 лет назад

    +ludic science..... can I use flyback transformer instead of ignition coil???

  • @owatthorne2538
    @owatthorne2538 7 лет назад

    hi, how voltage voltage and amps or watts consumed when at the lowest of the dimmer.

  • @mrgreenswelding2853
    @mrgreenswelding2853 6 лет назад

    Can you use this for a jacobs ladder?

  • @luisanchez1325
    @luisanchez1325 7 лет назад

    hola, el flujo de 10 a 12 KV genera estática a su alrededor?

  • @RoboticNerd
    @RoboticNerd 8 лет назад +1

    Cool new intro

    • @ludicscience
      @ludicscience  8 лет назад

      +YTPmaster thanks to +OBV10U3_NINJA

  • @danielhedbloom3741
    @danielhedbloom3741 7 лет назад

    What are the specifics of the ignition coul

  • @unknowunknown9096
    @unknowunknown9096 2 года назад

    Why don't adjust capacitor to resonance frequency of lc

  • @ShadowGPSDFX
    @ShadowGPSDFX 2 года назад

    Can you show how to make the voltage multiplier.

  • @anondusery1271
    @anondusery1271 6 дней назад

    Can this be used as a normal, continuous Ac power supply or is it just for creating spark pulses?

    • @mabvutomooya3555
      @mabvutomooya3555 9 часов назад

      My question too

    • @ludicscience
      @ludicscience  2 часа назад

      It is not continuous AC

    • @anondusery1271
      @anondusery1271 2 часа назад

      @@ludicscience So, it is a spark generator, not a power supply as the title states. Oh, well, thanks for the demonstration.

  • @chenelson185
    @chenelson185 6 лет назад

    what can you do with hight voltage after 220ac

  • @NOBOX7
    @NOBOX7 10 месяцев назад

    great work

  • @thebeststooge
    @thebeststooge 8 лет назад +3

    I wouldn't put 117Vac into something designed for low voltage DC for sure. wow.

    • @problems-hf8ts
      @problems-hf8ts 8 лет назад +2

      +Dark Alchemist He used a capacitor in series with the coil to limit the current. I once powered a small dc motor with 220vac using 0.5 amp ballast.

    • @vptech9861
      @vptech9861 4 года назад

      Anyway when the ignition coil operates in its normal conditions it operates in switched mode. So self induction generates about 100V at the primary. The problem here may be the heavy operating duty cycle (so the high average power) more than the voltage amplitude.

  • @tonystark3391
    @tonystark3391 6 лет назад

    can I use ignition coil of a motorcycle instead?

  • @falconhtv329
    @falconhtv329 4 года назад

    I only have 220v AC what can I do, with transformer 220v to 110v did not work, help

  • @patriotnour912
    @patriotnour912 4 года назад

    Good evening explanation is excellent but I want to lift the spark للسياراة to improve the performance what is the way, and thanks for

  • @revscott58
    @revscott58 7 лет назад +1

    Does the value of the capacitor affect the frequency to the coil, or does the frequency to the coil stay at line frequency of 60htz? Also some of the eBay dimmers have 4 connections, 2 incoming and 2 outgoing. can this type of dimmer still work? I am trying to make a plasma ball driver which I can vary the frequency and voltage. I had also thought of using a pwm with both frequency and pulse width adjustability. Might this work?

  • @easternanglers95
    @easternanglers95 6 лет назад

    hy friend... what type of light dimmer you chose?

  • @smartlife9113
    @smartlife9113 7 лет назад

    Hello, and good videos.
    1) You use AC input, but... is it AC in the input of the coil?
    I would like to use AC in the input of the ignition coil. Thanks.
    2) I have 250 AC in the wall socket, can I use 1000 Volts, 1uF Capacitor or it would be too much?

    • @ludicscience
      @ludicscience  7 лет назад

      at the input of the coil there is chopped AC. Yes 1 uf or less.

  • @CherryTree230e
    @CherryTree230e 3 года назад

    would a microwave capasitor work .

  • @commanderofficial6903
    @commanderofficial6903 8 лет назад +1

    plz give one clap switch circuit video

  • @tad2ik
    @tad2ik Год назад

    Is it safe?

  • @aldoramon6934
    @aldoramon6934 5 лет назад

    Te hago una consulta es solo alta tension o tiene amperaje la descarga. quiero saber si es aplicable a un electrificador de Cercas o es peligroso para uso humano por estar conectado directo a la red .

    • @WindowsDefender2
      @WindowsDefender2 5 месяцев назад

      eso hay que preguntárselo a el ladrón cuando intente entrar a tu casa a ver que dice xD

  • @mecanicailer134
    @mecanicailer134 5 лет назад +1

    Very nice.

  • @VanDerLaars
    @VanDerLaars 2 года назад

    Hi, you connected the ignition coil to 110v, right? Is the capacitor required because of that? Cause the coil is rated for 24v?!?!

    • @jakefriesenjake
      @jakefriesenjake Год назад +1

      It's too reduce the amps

    • @harms123
      @harms123 Год назад +1

      The capacitors capacitive reactance limits the current to an acceptable level at the mains frequency.

  • @faheemnasrullah3202
    @faheemnasrullah3202 3 года назад

    Is this work 220 also and tell me it work long work time

  • @b0dynsoul
    @b0dynsoul 4 года назад +1

    Ludic, can I use this as a fence charger? Thanks

    • @ELFMEDIA
      @ELFMEDIA 2 года назад

      No! It's not isolated from AC network, you need to add a transformer

  • @peetbronkhorst5473
    @peetbronkhorst5473 2 года назад

    Is this a capacitive dropper circuit not shure if anyone wil read this

  • @TheSpinninHead
    @TheSpinninHead 3 года назад

    Nice and simple. I want to make one AC spark generator with 20-50KV at 200kHz. Can u plz tell how to do it?

    • @jakefriesenjake
      @jakefriesenjake Год назад

      Yes please! I want to make an electric chair too! Please post.

  • @pavloskellerman2614
    @pavloskellerman2614 7 лет назад

    How many amps does this thing output/

  • @mac91077
    @mac91077 5 лет назад

    Capacitor values in voltage doubler circuit?