Or more (volts that is).
Any quick & dirty circuits that'll do this? Something that self-limits in current would be nice, but not necessary. I want to test voltage regulators. Ideally it'd be battery powered, but that's not a necessity.
Just looking for a quickie one-off.
Thanks.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!
Ebay copier high voltage supply?
Or but a used HV bench supply, which is handy to have around.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
What, you didn't suggest your Cockcroft-Walton HV multiplier circuit and parts? With higher starting supply voltages it can easily do 2kV.
--
Thanks,
- Win
I posted one here in 2013.
It shows up - well down the page - here
The difficult bit is getting a decent oscillation frequency despite the relatively high interwinding capacitances you get in high turns-ratio transformers. Banked winding help, but it's hard to find multi-section formers these days.
-- Bill Sloman, Sydney
Yes, and automatically self-limiting current - after a fashion - as the chain grows.
This is pretty quick and dirty way to get ~1kV, could probably be adapted for 2:
Hope I got the dots right...
Steal the xfmr, cap and diode from a microwave oven; the maggie seems to get a regulated drive (but it also is the second diode in the DC scheme of things). Or, a flyback xfmr in a joule thief configuration?
-- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
How much voltage can you get out of a laptop backlight supply?
If you only need one of something, it's a lot easier to buy than build. Less fun, of course.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Probably, enough. eBay search for "CCFL transformer" pulls up some of the HV magnetics parts, but also complete DC/DC converters, for not much money.
I'm a fan of the HP 6110A. It's 0-3 kV, 6 mA, with thumbwheel switches to set the voltage.
Just the ticket for PMTs and such stuff.
Cheers
Phil Hobbs
That was my thought C-W from 120 or 240 AC? (Or do you need a faster frequency?) Not sure it would be dirty or quick though.
George H.
For a simple start, see LTC AN29 Fig. 49.
The flyback transformer has been discontinued; I'd suggest adapting the circuit for the Pulse PA-0367A (1:12 transformer) instead.
The Wurth 750 032 050 (1:10) is available from Mouser, too.
Another approach is to use one of the multi-winding inductors, like this:
Cheers, James Arthur
I have a nice Kepco 3KV supply. It has a kilovolt-step rotary switch and a 10-turn pot. There is one tube inside.
We also have a rackmount beast Bertan 10KV supply, which is rarely used. It is sometimes useful, like to see where a transformer or connector or PCB actually breaks down.
I was doing a breakdown test on a PCB and kept getting weird currents. It was corona on the test leads.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
OK, OK, here it is.
The transformer is 1:1, not much step-up, but the cute little MMBD5004 diodes (and PCB clearances) couldn't handle much more.
The PCB layout was a real challenge, maintaining the surface and internal voltage clearances without making it too ugly.
Here's a little one, 5-to-1200 volts as I recall. Hand-wound pot core step-up.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Right. (I'm scared of HV.) Could you make a C-W with just a function generator? ~10Vp-p at ~200mA (lots of stages...) Maybe a little transformer before the C-W?
That would be quick and dirty. (If you had the transformer.)
George H.
It's not exactly "battery powered", but a TEK 576 curve tracer will put out 1500V. Doesn't everybody have one of those somewhere in the lab?
I like the idea of something that's inherently low current. 500mA at
2000V seems a lot scarier than 100uA at same.-- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!
On 03/20/2017 11:11 AM, snipped-for-privacy@yahoo.com wrote:
What about this class C thing, it goes to ~1kV using a single BJT. Add a few multiplier stages for 2, should put out 100uA no problem.
OP could wind the xfmr by hand on a small ferrite toroid.
The BJT should probably be at least a 150V 3 amp type. Tank freq is around 100kHz
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Might need a catch diode on the base to avoid blowing the e-b junction too
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