Make 2000V at 100uA

I think it's easier to just build a simple 1 transistor power oscillator on perfboard with a couple stages of multiplication and hand-wind a little inductor than try to futz around with an "eBay Special" tazer circuit designed to make over 60kV into doing what I wanted. Could probably have finished it in the time we spent talking about it; certainly long before a package from China arrived.

YMMV

Actually, this is a better scheme: just throw more hardware at the problem:

The basic Cockcroft-Walton rectifier is halfwave, so you use two to make a fullwave variant, but you can share half the capacitors (on the 'center leg') instead of duplicating them.

well dont touch 'em, then. whut r u some sort of perv lolz?

Not at all. If you want a really close-coupled centre-tapped pair, you wind it "bifilar" - work out how long a bit of wire you need, cut off two bits a bit long than that, twist them, and wind on the twisted pair.

National Bureau of Standards precision freaks assure us that the two halves of the pair are identical to one part in a billion. You probably need the two bits of wire to come off the same reel for that - reel to reel toleranc e on wire resistance is usually +/-2% (which implies +/-1% on diameter).

On Tuesday, March 21, 2017 at 4:50:01 PM UTC-4, bitrex wrote:

Oh that's right, I forgot -- simulated transformers don't saturate.

Here, I tweaked it into a blocking version. It gets 1.4kV from +24V instead of yours making 900V from +48V, and is a bit easier on the base drive.

Version 4 SHEET 1 1380 680 WIRE 64 32 -80 32 WIRE 208 32 208 -16 WIRE 208 32 64 32 WIRE 480 64 304 64 WIRE 656 64 544 64 WIRE 912 64 656 64 WIRE 992 64 912 64 WIRE 1152 64 1056 64 WIRE 1360 64 1152 64 WIRE 208 112 208 32 WIRE 304 112 304 64 WIRE -272 128 -272 96 WIRE -80 128 -80 32 WIRE 64 128 64 32 WIRE 656 128 656 64 WIRE 912 128 912 64 WIRE 1152 128 1152 64 WIRE 1360 128 1360 64 WIRE -272 240 -272 208 WIRE 304 240 304 192 WIRE 656 240 656 192 WIRE 656 240 304 240 WIRE 720 240 656 240 WIRE 752 240 720 240 WIRE 912 240 912 192 WIRE 912 240 816 240 WIRE 1152 240 1152 192 WIRE 1152 240 912 240 WIRE 1232 240 1152 240 WIRE 1360 240 1360 192 WIRE 1360 240 1296 240 WIRE 64 256 64 192 WIRE 208 256 208 192 WIRE 208 256 64 256 WIRE 464 288 320 288 WIRE -80 320 -80 208 WIRE -16 320 -80 320 WIRE 96 320 48 320 WIRE 464 336 464 288 WIRE 1360 336 1360 240 WIRE 720 352 720 240 WIRE 208 368 208 256 WIRE 400 368 320 368 WIRE 656 384 656 240 WIRE -80 416 -80 320 WIRE -32 416 -80 416 WIRE 96 416 96 320 WIRE 96 416 48 416 WIRE 144 416 96 416 WIRE 96 448 96 416 WIRE 720 464 720 432 WIRE -80 480 -80 416 WIRE 96 544 96 512 WIRE 208 560 208 464 WIRE -80 640 -80 544 WIRE 400 640 400 368 WIRE 400 640 -80 640 FLAG 208 -16 Vcc FLAG 208 560 0 FLAG 464 336 0 FLAG -272 240 0 FLAG -272 96 Vcc FLAG 1360 336 0 FLAG 656 384 HV_OUT IOPIN 656 384 Out FLAG 96 544 0 FLAG 720 464 0 SYMBOL ind2 192 96 R0 WINDOW 3 34 74 Left 2

SYMATTR InstName L1 SYMATTR SpiceLine Rser=.1 SYMBOL ind2 288 96 R0 SYMATTR InstName L2 SYMATTR Value 1mH SYMBOL npn 144 368 R0 SYMATTR InstName Q1 SYMATTR Value 2SCR375P SYMBOL ind2 336 384 R180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L3

SYMBOL cap 48 128 R0 SYMATTR InstName C1 SYMATTR Value 50p SYMBOL res -96 112 R0 SYMATTR InstName R2 SYMATTR Value 47k SYMBOL res 64 400 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 220 SYMBOL cap 48 304 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 1n SYMBOL voltage -272 112 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 24 SYMBOL cap -96 480 R0 SYMATTR InstName C3 SYMATTR Value 22n SYMBOL cap 544 48 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 100nF SYMBOL diode 640 128 R0 WINDOW 3 -114 32 Left 2 SYMATTR Value RFN1L7S SYMATTR InstName D1 SYMBOL cap 816 224 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 100nF SYMBOL cap 1056 48 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value 100nF SYMBOL cap 1296 224 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C7 SYMATTR Value 100nF SYMBOL diode 928 192 R180 WINDOW 0 24 64 Left 2 WINDOW 3 52 27 Left 2 SYMATTR InstName D2 SYMATTR Value RFN1L7S SYMBOL diode 1136 128 R0 WINDOW 3 -118 31 Left 2 SYMATTR Value RFN1L7S SYMATTR InstName D3 SYMBOL diode 1376 192 R180 WINDOW 0 24 64 Left 2 WINDOW 3 58 33 Left 2 SYMATTR InstName D4 SYMATTR Value RFN1L7S SYMBOL diode 112 512 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D5 SYMBOL res 704 336 R0 SYMATTR InstName R1 SYMATTR Value 10meg TEXT -392 344 Left 2 !K1 L1 L2 L3 1 TEXT -392 296 Left 2 !.tran 1 startup uic

I'm actually not sure what's flat-topping the flyback voltage--I'd think it would go higher.

Why doesn't yours have a higher resonance peak?

Cheers, James Arthur

How about this?