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Registered Member #938
Joined: Sat Aug 04 2007, 05:39AM
Location: Honokaa,HI,USA
Posts: 65
I built a small 7 stage half wave HV multiplier using 223K 22nf 600 volt capacitors, and some 1n4007 diodes. I plan on using a camera's transformer to power it, to get a few thousand volts. As a test I fed it 19 VAC(it's a 12VAC transformer but that's what it's putting out), I get around 30VDC for the first stage. The next stage it went up to 45 VDC. Then the voltage drops a few volts after that. Is it that my power source is relatively speaking low voltage, and the components I'm utilizing are somewhat lossy when they are being fed low voltage? The capacitors did come from China(they were rather cheap), could it be a defective capacitor?
Registered Member #938
Joined: Sat Aug 04 2007, 05:39AM
Location: Honokaa,HI,USA
Posts: 65
What if I go about utilizing a camera flash transformer? I'm not sure what frequency they are but it has to be higher then 60 hertz. However since from what I can understand I need ultrafast diodes And a higher input frequency. Will my current capacitors work if I utilize the correct diodes? What model # of diodes do you recommend?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
the best way is to make the camera flash circuit and start from there. a higher frequency will help. 1n4007's should work at least to some extent for you to get an idia of what is going on. What is your load?
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
I found diodes to be much more important than I had thought some time back. Their proper selection is critical. Check this link:
There are some very good deals on HV diodes also. You don't have to pay exorbitant prices; especially if you hunt down some of the HV parts sources. These guys have some decent doorknob caps too. I have bought from these guys and was pretty happy with the parts and cost:
I've used strings of 1n4007's and they functioned; but when I expanded my horizons the difference in components was substantial.
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
If he's using a camera flash transformer as the source, he doesn't need HV diodes, just high speed. You need the diodes to handle double the input voltage, which will be a few hundred volts max. Ordinary 1kV fast diodes ought to be just fine, UF4007 is probably suitable and can be found cheaply.
Registered Member #938
Joined: Sat Aug 04 2007, 05:39AM
Location: Honokaa,HI,USA
Posts: 65
Yes I plan on utilizing a camera charging circuit, however since I "had" to test it I used a low voltage PSU. I when I tested it with the low voltage source I had no load other then my multimeter(I went up the multiplier so I wouldn't fry my meter if it did(It didn't, no ozone, lit neon bulbs or the like) work). I will purchase the proper diodes and rebuild the multipleir. Thanks for input, I really appreciate it.
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HV Multiplier
