Version 4
SHEET 1 880 784
WIRE -336 288 -384 288
WIRE -192 288 -256 288
WIRE -144 288 -192 288
WIRE -48 288 -144 288
WIRE 112 288 -48 288
WIRE 112 304 112 288
WIRE -32 352 -64 352
WIRE 16 352 -32 352
WIRE 48 352 16 352
WIRE 144 352 112 352
WIRE -384 384 -384 288
WIRE -320 384 -384 384
WIRE -288 384 -320 384
WIRE -256 384 -288 384
WIRE 16 384 16 352
WIRE -64 400 -64 352
WIRE 176 400 160 400
WIRE 256 400 240 400
WIRE 272 400 256 400
WIRE 336 400 272 400
WIRE 432 400 400 400
WIRE 464 400 432 400
WIRE -320 416 -320 384
WIRE -384 432 -384 384
WIRE -256 432 -256 384
WIRE -192 432 -192 288
WIRE 112 432 112 400
WIRE 160 432 160 400
WIRE 160 432 112 432
WIRE -144 448 -144 288
WIRE -128 448 -144 448
WIRE -64 464 -64 448
WIRE 352 464 320 464
WIRE 464 464 464 400
WIRE 464 464 432 464
WIRE 16 480 16 464
WIRE 64 480 16 480
WIRE 112 480 112 432
WIRE 112 480 64 480
WIRE 256 480 256 400
WIRE 256 480 128 480
WIRE -64 512 -64 496
WIRE 224 512 160 512
WIRE 240 512 224 512
WIRE 320 512 320 464
WIRE 320 512 240 512
WIRE -384 528 -384 496
WIRE -320 528 -320 496
WIRE -320 528 -384 528
WIRE -256 528 -256 512
WIRE -256 528 -320 528
WIRE -192 528 -192 512
WIRE -192 528 -256 528
WIRE -64 528 -64 512
WIRE -64 528 -192 528
WIRE 0 528 -64 528
WIRE 128 528 128 480
WIRE 128 528 80 528
WIRE 464 528 464 464
WIRE 464 528 304 528
WIRE 160 560 160 512
WIRE 304 560 304 528
WIRE 464 576 464 528
WIRE -112 592 -112 576
WIRE 416 592 400 592
WIRE -64 608 -64 528
WIRE -32 608 -64 608
WIRE 64 608 48 608
WIRE 96 608 64 608
WIRE 224 608 224 512
WIRE 240 608 224 608
WIRE 352 608 304 608
WIRE 160 624 160 608
WIRE 352 640 352 608
WIRE 416 640 400 640
WIRE -112 672 -112 656
WIRE 64 688 64 608
WIRE 304 688 304 656
WIRE 304 688 64 688
WIRE 464 688 464 656
WIRE -64 704 -64 608
WIRE 160 704 160 656
WIRE 160 704 -64 704
WIRE 400 704 400 640
WIRE 400 704 160 704
WIRE 224 736 224 608
WIRE 304 736 224 736
WIRE 464 736 464 688
WIRE 464 736 384 736
FLAG -48 288 Vb1
FLAG -32 352 Vb1p
FLAG 64 480 Vd1
FLAG 144 352 0
FLAG -64 464 0
FLAG -64 512 4
FLAG -112 576 2
FLAG -112 672 1
FLAG -288 384 Ctrl1
FLAG 432 400 Vd2
FLAG 240 512 Vb2
FLAG 272 400 3
FLAG 64 608 Vb2p
FLAG 160 624 0
FLAG 464 688 N001
FLAG 400 592 Ctrl1
FLAG 352 640 0
SYMBOL Miscel\\npn4 -128 400 R0
WINDOW 0 -1 -1 Left 0
WINDOW 3 17 52 Left 0
SYMATTR InstName Q1
SYMATTR Value NP
SYMBOL Miscel\\pnp4 48 304 R0
WINDOW 0 -23 32 Left 0
WINDOW 3 19 49 Left 0
SYMATTR InstName Q2
SYMATTR Value PN
SYMBOL res -208 416 R0
WINDOW 0 31 47 Left 0
SYMATTR InstName R3
SYMATTR Value {RH2}
SYMBOL diode -96 656 R180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value DL
SYMBOL res -336 400 R0
WINDOW 0 23 47 Left 0
WINDOW 3 25 87 Left 0
SYMATTR InstName R1
SYMATTR Value 1
SYMBOL cap -400 432 R0
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL res -352 304 R270
WINDOW 0 15 4 VTop 0
WINDOW 3 43 124 VBottom 0
SYMATTR InstName R2
SYMATTR Value {RH1}
SYMBOL res 32 480 R180
WINDOW 0 -39 77 Left 0
WINDOW 3 -69 51 Left 0
SYMATTR InstName R4
SYMATTR Value {RH3}
SYMBOL bi -256 432 R0
WINDOW 3 -48 114 Left 0
SYMATTR InstName B1
SYMATTR Value I=-500*I(D1)*3m/Itrig
SYMBOL res 448 448 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R6
SYMATTR Value {RH2}
SYMBOL diode 400 384 R90
WINDOW 0 16 75 VBottom 0
WINDOW 3 21 74 VTop 0
SYMATTR InstName D3
SYMATTR Value Di
SYMBOL Miscel\\pnp4 96 560 R0
WINDOW 0 -3 100 Left 0
WINDOW 3 -1 -4 Left 0
SYMATTR InstName Q3
SYMATTR Value PN
SYMBOL Miscel\\npn4 240 656 M180
WINDOW 0 2 -8 Left 0
WINDOW 3 -3 96 Left 0
SYMATTR InstName Q4
SYMATTR Value NP
SYMBOL e 464 560 R0
SYMATTR InstName E1
SYMATTR Value -1
SYMBOL res 400 720 R90
WINDOW 0 14 110 VBottom 0
WINDOW 3 -14 6 VTop 0
SYMATTR InstName R5
SYMATTR Value {RH1}
SYMBOL res 64 592 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R7
SYMATTR Value {RH3}
SYMBOL diode 240 384 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName D2
SYMATTR Value Di
SYMBOL res 96 512 R90
WINDOW 0 16 120 VBottom 0
WINDOW 3 -10 2 VTop 0
SYMATTR InstName R34
SYMATTR Value 1e8
TEXT -384 160 Left 0 !.MODEL PN PNP(Is=1e-15 BF=10 Cjc=10p Cje=20p Tf=0.1u Ise=1e-12)\n.MODEL NP NPN(Is=1e-15 BF=10 Cjc=10p Cje=20p Tf=0.1u Ise=1e-12)\n.MODEL Di D(Is=0.1u Rs=2 Cj0=50p)\n.MODEL DL D(Is=1e-20 Rs=5)
TEXT -392 576 Left 0 !.PARAM Itrig=15m\n.PARAM RH1=20k\n.PARAM RH2=20k\n.PARAM RH3=16.7k