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Forums
4hv.org :: Forums :: High Voltage
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very low power hv supply?

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alf
Tue Jul 19 2011, 06:06PM Print
alf Registered Member #3925 Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121
hey,

any ideas how to build a variable (not essential) 1-5kv supply, which can run from a 9v battery, and will use a very maximum of 10W? its for my tiny crt oscilloscope anode voltage.

thanks. Alf.
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Ash Small
Tue Jul 19 2011, 06:20PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
A DC flyback, maybe?

Maybe driven by a transistor?
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Proud Mary
Tue Jul 19 2011, 06:35PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Xenon flash transformers are often very compact - miniature - low powered, inexpensive, and easy to find.

I'd suggest you first get hold of the CRT data sheet, so you know exactly what your power supply requirements will be.
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Dr. Dark Current
Tue Jul 19 2011, 09:28PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
A 555+transistor, little mains transformer in reverse and a few stage cw multiplier.
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Proud Mary
Tue Jul 19 2011, 10:31PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Dr. Kilovolt wrote ...

A 555+transistor, little mains transformer in reverse and a few stage cw multiplier.

I don't think Alf's 9V battery would last very long with a setup like that - not an ordinary PP3 one, anyhow - and, in any case, PP3 and the 10W mentioned by Alf don't really hang together, do they?


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Forty
Tue Jul 19 2011, 11:35PM
Forty Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
555 driving a transistor driving a ccfl transformer might work.
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Juniortore1
Thu Jul 21 2011, 06:29PM
Juniortore1 Registered Member #4014 Joined: Wed Jul 20 2011, 05:31PM
Location: SE Michigan
Posts: 25
Maybe a ZVS ballasted by a 10W light bulb or something. Very cheap if using low power parts, and heat free.
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Forty
Thu Jul 21 2011, 06:47PM
Forty Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
does the zvs work fine with non-flyback transformers? like ferrite e-cores and pot cores. I imagine they do, but i haven't tried. you could probably make a little hv low power transformer with those. a ccfl inverter transformer would be the easiest premade transformer
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hboy007
Thu Jul 21 2011, 07:28PM
hboy007 Registered Member #1667 Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
CCFL inverter + villard cascade maybe?
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radiotech
Thu Jul 21 2011, 07:38PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
As Proud Mary said, get the CRT data sheet up front.

Also, what is going to light the heater of the CRT ?

It its mains, then a transformer/multiplier might be used.
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