# 30kv .3mA DC power supply tips?

1. Nov 11, 2011

### Fungiwrangler

Hello, I interesting in making a high voltage power supply for capillary electrophoresis. Not much power is required and the DC does not need totally noise free so I figure this gives me a lot of flexibility. I would love the ability to adjust the voltage at 5kv increments in maybe a 5-30kv range. It would be great if the voltage could be adjusted/turned on+off using a microcontroller whether I need analog output or to add a relay/transistor it doesnt matter. Also I would prefer to power this supply using either 5 or 12V DC.

Can anyone point me in the right direction? I bet there are some exotic circuits that this would be perfect for.

You could check on ebay and you might find a power supply for $20.00. 4. Nov 14, 2011 ### Squid1775 I would suggest using an inverter. You can use your house socket (120 VAC), a transformer (probably a step-up or some other high voltage transformer), some transistors, and switches. **Safety Warning** Very high voltage!! It can kill you!! Using that stuff would be a hack job though for$20 or less. The specifics that you request (5KV increment) requires custom design which is going to cost more whether you do it yourself or you find a commerical product. Your SAFEST bet is go buy it commerically because then it will most likely be UL listed.

5. Nov 14, 2011

### cmb

This is TV line output flyback territory. You can usually pick one up for a couple of bucks, then build a switching circuit.

There are diy-level instructions at http://www.blazelabs.com/e-exp03.asp , where they are suggesting getting 2.2mA at 30kV from one.

If you can wait 8 months, then [if anyone is interested] I'll pin up here a patent of mine that is currently filed but not published that can also accomplish your requirement with much less effort. (I have a 1 to 20kV 5mA prototype I've been using for HV work for the last year, which I built from new commercial stock parts for a total BOM = 12 euros, and which you can stack in parallel or serial with the same again as it is a DC uncoupled output.)

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