Version 4 SHEET 1 1144 1448 WIRE -2720 16 -3104 16 WIRE -2048 16 -2720 16 WIRE -1664 16 -2048 16 WIRE -3104 64 -3104 16 WIRE -2720 112 -2720 16 WIRE -1664 112 -1664 16 WIRE -3104 192 -3104 144 WIRE -2928 192 -3104 192 WIRE -1664 224 -1664 192 WIRE -2720 240 -2720 192 WIRE -2720 240 -2864 240 WIRE -2048 240 -2048 16 WIRE -2720 352 -2720 240 WIRE -2544 352 -2720 352 WIRE -2928 368 -2928 288 WIRE -2832 368 -2928 368 WIRE -3104 400 -3104 192 WIRE -2928 400 -2928 368 WIRE -2720 400 -2720 352 WIRE -2048 400 -2048 320 WIRE -1664 400 -2048 400 WIRE -2832 448 -2832 368 WIRE -2832 448 -2864 448 WIRE -2816 448 -2832 448 WIRE -2784 448 -2816 448 WIRE -2048 496 -2048 400 WIRE -2112 544 -2352 544 WIRE -2544 560 -2544 432 WIRE -2928 736 -2928 496 WIRE -2720 736 -2720 496 WIRE -2048 736 -2048 592 WIRE -3104 768 -3104 464 WIRE -2816 800 -2816 448 WIRE -2352 800 -2352 544 WIRE -2352 800 -2816 800 FLAG -1664 224 0 FLAG -3104 768 0 FLAG -2544 560 0 FLAG -2720 736 0 FLAG -2048 736 0 FLAG -2928 736 0 SYMBOL voltage -1664 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 -3120 48 R0 SYMATTR InstName R3 SYMATTR Value 22MEG SYMBOL cap -3120 400 R0 SYMATTR InstName C1 SYMATTR Value 220µF SYMBOL res -2560 336 R0 SYMATTR InstName R4 SYMATTR Value 22MEG SYMBOL res -2736 96 R0 SYMATTR InstName R1 SYMATTR Value 10MEG SYMBOL npn -2112 496 R0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL res -2064 224 R0 SYMATTR InstName R2 SYMATTR Value 22MEG SYMBOL npn -2864 400 M0 SYMATTR InstName Q4 SYMATTR Value 2N3904 TEXT -3096 -72 Left 2 !.tran 0 9500000m 0 5000u uic TEXT -2560 120 Left 2 ;David Pilling 2016 TEXT -1824 440 Left 2 ;ATMega pin 2