Variable Cheap High Voltage Power Supply

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Introduction: Variable Cheap High Voltage Power Supply

About: I make stuff sometimes. Now that I have a job and family less than I could, but i love spending time with them so it's ok.

Build a regulated high voltage power supply for capacitor charging or another high voltage application. This project can cost less than $15 and you will be able to obtain upwards of 1000V and be able to adjust the output from 0-1000V+.

This instructable is for those with excellent electronic safety knowledge.



This device can easily KILL you as well as explode. BE VERY RESPONSIBLE AND BE VERY VERY CAREFUL NOT TO DIE, it is usually a bad thing.



This device is notsafe, if you think it is safe you're wrong :)
PLEASE, PLEASE BUY AND WEAR ELECTRICIAN GLOVES RATED MUCH GREATER THAN THE VOLTAGES YOU PLAN TO USE. THE COST IS WORTH YOUR LIFE.
(I got mine off Ebay for a good deal) Thank you




ANY TIME YOU WORK WITH MAINS VOLTAGE YOU NEED TO ALWAYS HAVE AN ISOLATION TRANSFORMER OR VARIAC.




General Voltage Multiplier:

-Stranded Wire(18-22gauge)
-Disposable cameras(for free capacitors, which you can obtain by asking a local photo store, such as in Walmart,6 for 1000V output)(You can also buy capacitors online)(>330V, >120uF the more capacitance the capacitors have the more efficient your supply will be)
-1000V 6A Diodes(6 for 1000V output)(you can use diodes rated at 400V 6A and up if disired)
-Wall Plug
-120VAC 16A SPST Switch

Regulator Parts:

-9-14VDC 1A plug in Transformer (you can just use a 9V Battery if a transformer is not on hand)
-Two small protoboards (One is optional for the voltage multiplier)
-LM7805 Voltage Regulator
-LM393 Comparator(or LM1393 for better performance)
-12VDC 30A Relay
-8 pin DIP IC Socket
-Transistor(3904 or upwards)
-1 diode (100V 1A)(IN4001)
-2 small capacitors (.01-.1uF)(can be obtained from disposale cameras)(optional)
-2 LED Indicator lights(optional, can be obtained from disposale cameras)
-Resistors
-See step 2 for resistor details

-Most of the parts listed can be obtained at Digikey.com or Mouser.com.
-I got my protoboards at www.mpja.com
-The Relay at www.goldmine-elec.com for only $1.25, works great
-I got the transformer for cheap at harbor freight.

These places are just where the cheapest parts are that I've found so far. It may be more economical to buy the parts at one place due to shipping costs.

WEAR ELECTRICIAN GLOVES, BUY THEM, WEAR THEM!!!

_____________________________________________________________

VISIT MY WEBSITE FOR MORE PROJECTS: FUTURE EXPERIMENTAL SYSTEMS

Step 1: Voltage Multiplier

The Voltage Multiplier can be made separately without the regulator if necessary. The first step is to put the capacitors together. Use larger capacitance to maximize the voltage reached and regulator functioning. If you want to mount yours on a protoboard just slide in and solder you capacitors in place. If a protoboard is not desired, simply tape or glue them together. Solder your diodes on according to the schematic below.

It is important that you test your voltage multiplier before you hook it up to your regulator.

Step 2: Voltage Regulator

The Voltage Regulator will take a bit more time than the multiplier but once done it will be well worth it. Test the basic schematic on a breadboard before you make a permanent arrangement if you find it necessary. After you have tested it just solder all of the components in place following the schematic and picture.

Resistor values:

Values for 6 Capacitor/Diode Multipliers:
R1-1K
R2-100-500
RL2-RL3-1K
RA-3M(3x1M)
RB-11K
VR1-10K Variable Resistor

If you wish to have a higher or lower output voltage the resistances will need to be different. Or if you have different valued resistors for RA or RB.
Use the following equations to figure out your values.

Min resistance=(HV*HV)/(total resistor power rating in Watts)

RA/RB=.2*(HV-5)

Where HV is the output voltage of the multiplier
Resistors need to be rated for HV

Step 3: Putting It All Together

Put it in a container or box and just finish it all up.

WARNING
-NEVER TOUCH THE OUTPUT LEADS(the capacitors can still be charged even after shut-off, and yes it can and Will kill you)
-NEVER SHORT THE MULTIPLIER OUTPUT LEADS(The capacitors will explode!!)
-THIS PROJECT IS VERY DANGEROUS, BE SAFE AND LABEL YOUR SUPPLY, WARN PEOPLE IN YOUR HOUSE.

I take no responsibility for you shocking, hurting, or otherwise acting stupid around this device. BE SMART!!

Oh, and have fun :)

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    95 Comments

    This has to be the funniest thing I ever read :
    "AND BE VERY VERY CAREFUL NOT TO DIE, it is usually a bad thing."
    :-)))
    But yes, very good info in this instructable!

    1 reply

    Yeah hold my beer and watch this.

    I need it to do at least 12 amps. How do I do it?

    Hi, does we need fast diodes for this? I saw you use transistor that usually do in the kHz range so ..

    i want to do a variable power suppy ranging 0-50v using the mains and also a transformer.... plz help me about my work !!

    this is certainly not dangerous. this is quite a good design. but i don't think that voltage multipliers are as efficient as switch mode power supplies or flyback drivers which are capable of giving out more power.

    would i be able to change the power from instead of a wall outlet a 70 volt generator, to make at least 500v. i want to make a hand crank tesla coil and i need a high voltage power supply, is there any way to size this down for less power input?

    Nice job. I like the 'lets look inside' idea with the clear plastic. An improvement to consider would be to use the high voltage feedthru from a microwave oven magnetron tube as your output terminal. It is rated at 5Kv and would dress up the box a bit. Could you use an external 12VDC 1.5Amp power supply and eliminate the internal 9-14 Volt supply? raving apache

    3 replies

    Yes any external supply within the 9-14V range would work, you could even use a 9V battery if you want.

    so what you saying is that this will work with any voltage , even form batteries?
    so technicaly this means that if i made this, but only in 2 stages, this would then multiply the voltage twice correct? say from 8 v dc to 16v dc
    or would i need to make more stages but use weaker capasitors r the same, im relay in a pickle right now i cant sem to find any voltage multiplier instructions on the web for doubling voltage from 4 to 12 or 6 to 12

    you build a filp cover for the capacitor leads so no one will accidently touch it

    We do not care about commenting negatively. This is a serious safety concern. This is a bad design and if someone were foolish enough to make this, something bad could happen.

    i see you use 6A diodes  but your circuit if feeded whit 1A max (depend on the transfo)  i imagin that 1A diode should be on the limit ???

    the rating you said is what you use   but is it the minimum requirement?

    This looks like a dangerous circuit. The HV is somehow couple to the variable resistor. This is potentially dangerously. This is certainly not a good way to create a HV supply.

    1 reply

    I agree this design should not be allowed to be published on this site its highly dangerous and is a safety hazard, i bet the designer is not even HV qualified,l it breaches a multitude of electrical regulations both in the EU and USA/Canada im sure the IET and IEEE would not be happy..

    Where's your isolation transformer on the hv input side.