Version 4
SHEET 1 1144 1448
WIRE -3104 16 -3248 16
WIRE -2720 16 -3104 16
WIRE -2528 16 -2720 16
WIRE -3248 48 -3248 16
WIRE -3104 64 -3104 16
WIRE -2720 112 -2720 16
WIRE -2528 112 -2528 16
WIRE -3248 192 -3248 128
WIRE -2928 192 -3248 192
WIRE -2528 224 -2528 192
WIRE -3248 240 -3248 192
WIRE -2720 240 -2720 192
WIRE -2720 240 -2864 240
WIRE -2720 352 -2720 240
WIRE -2544 352 -2720 352
WIRE -3248 400 -3248 320
WIRE -3104 400 -3104 128
WIRE -3104 400 -3248 400
WIRE -2720 400 -2720 352
WIRE -2928 448 -2928 288
WIRE -2784 448 -2928 448
WIRE -2544 560 -2544 432
WIRE -2720 768 -2720 496
FLAG -2528 224 0
FLAG -2720 768 0
FLAG -2544 560 0
SYMBOL voltage -2528 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 3
SYMBOL npn -2784 400 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL pnp -2864 288 R180
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL res -2736 96 R0
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL cap -3120 64 R0
SYMATTR InstName C1
SYMATTR Value 1000pf
SYMBOL res -2560 336 R0
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res -3264 32 R0
SYMATTR InstName R2
SYMATTR Value 3MEG
SYMBOL res -3264 224 R0
SYMATTR InstName R3
SYMATTR Value 900K
TEXT -3024 616 Left 2 !.tran 0 1500m 0 50u
TEXT -3008 568 Left 2 ;David Pilling 2017