Version 4
SHEET 1 1144 1448
WIRE -2720 -80 -3104 -80
WIRE -2544 -80 -2720 -80
WIRE -3104 -32 -3104 -80
WIRE -3104 64 -3104 48
WIRE -3104 64 -3264 64
WIRE -3104 96 -3104 64
WIRE -2720 112 -2720 -80
WIRE -2544 112 -2544 -80
WIRE -3104 192 -3104 160
WIRE -2928 192 -3104 192
WIRE -2544 224 -2544 192
WIRE -2720 240 -2720 192
WIRE -2720 240 -2864 240
WIRE -2720 352 -2720 240
WIRE -2544 352 -2720 352
WIRE -3104 400 -3104 192
WIRE -2720 400 -2720 352
WIRE -2928 448 -2928 288
WIRE -2784 448 -2928 448
WIRE -3264 512 -3264 64
WIRE -2928 512 -3264 512
WIRE -2928 544 -2928 512
WIRE -2544 560 -2544 432
WIRE -2800 592 -2864 592
WIRE -2720 592 -2720 496
WIRE -2720 592 -2800 592
WIRE -2800 624 -2800 592
WIRE -3104 768 -3104 464
WIRE -2928 768 -2928 640
WIRE -2800 768 -2800 704
FLAG -2544 224 0
FLAG -2928 768 0
FLAG -3104 768 0
FLAG -2544 560 0
FLAG -2800 768 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 20µF
SYMBOL res -2560 336 R0
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL npn -2864 544 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL schottky -3088 96 M0
SYMATTR InstName D2
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -2816 608 R0
SYMATTR InstName R4
SYMATTR Value 10MEG
TEXT -3000 8 Left 2 !.tran 0 15s 0 50u uic
TEXT -2984 -48 Left 2 ;David Pilling 2016