Introduction: Variable Cheap High Voltage Power Supply
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:
-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)
-120VAC 16A SPST Switch
-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)
-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.
Values for 6 Capacitor/Diode Multipliers:
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)
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.
-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 :)