Version 4 SHEET 1 1144 1448 WIRE -2720 16 -3104 16 WIRE -2544 16 -2720 16 WIRE -2352 16 -2544 16 WIRE -2208 16 -2352 16 WIRE -3104 64 -3104 16 WIRE -2208 96 -2208 16 WIRE -2720 112 -2720 16 WIRE -2544 112 -2544 16 WIRE -3104 192 -3104 144 WIRE -2928 192 -3104 192 WIRE -2544 224 -2544 192 WIRE -2720 240 -2720 192 WIRE -2720 240 -2864 240 WIRE -2352 240 -2352 16 WIRE -2208 288 -2208 176 WIRE -2208 288 -2288 288 WIRE -2352 336 -2576 336 WIRE -2720 352 -2720 240 WIRE -2576 352 -2576 336 WIRE -2576 352 -2720 352 WIRE -2544 352 -2576 352 WIRE -2208 352 -2208 288 WIRE -3104 400 -3104 192 WIRE -2720 400 -2720 352 WIRE -2928 448 -2928 288 WIRE -2784 448 -2928 448 WIRE -2208 496 -2208 432 WIRE -2544 560 -2544 432 WIRE -3104 768 -3104 464 WIRE -2720 768 -2720 496 FLAG -2544 224 0 FLAG -2720 768 0 FLAG -3104 768 0 FLAG -2544 560 0 FLAG -2208 496 0 SYMBOL voltage -2544 96 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 5 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 100K SYMBOL res -3120 48 R0 SYMATTR InstName R3 SYMATTR Value 10K SYMBOL cap -3120 400 R0 SYMATTR InstName C1 SYMATTR Value 100nF SYMBOL res -2560 336 R0 SYMATTR InstName R2 SYMATTR Value 100K SYMBOL npn -2288 240 M0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL res -2224 80 R0 SYMATTR InstName R8 SYMATTR Value 3K SYMBOL res -2224 336 R0 SYMATTR InstName R9 SYMATTR Value 1K TEXT -3000 56 Left 2 !.tran 0 150s 0 50u uic TEXT -3000 112 Left 2 ;David Pilling 2016