Version 4
SHEET 1 1144 1448
WIRE -2720 16 -3104 16
WIRE -2544 16 -2720 16
WIRE -3104 64 -3104 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 -2928 352 -2928 288
WIRE -2832 352 -2928 352
WIRE -2720 352 -2720 240
WIRE -2544 352 -2720 352
WIRE -3104 400 -3104 192
WIRE -2928 400 -2928 352
WIRE -2720 400 -2720 352
WIRE -2544 400 -2544 352
WIRE -2832 448 -2832 352
WIRE -2832 448 -2864 448
WIRE -2784 448 -2832 448
WIRE -2544 608 -2544 480
WIRE -3104 768 -3104 464
WIRE -2928 768 -2928 496
WIRE -2720 768 -2720 496
FLAG -2544 224 0
FLAG -2720 768 0
FLAG -3104 768 0
FLAG -2544 608 0
FLAG -2928 768 0
SYMBOL voltage -2544 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 2
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 3MEG
SYMBOL res -3120 48 R0
SYMATTR InstName R3
SYMATTR Value 2MEG
SYMBOL cap -3120 400 R0
SYMATTR InstName C1
SYMATTR Value 100pf
SYMBOL res -2560 384 R0
SYMATTR InstName R2
SYMATTR Value 3MEG
SYMBOL npn -2864 400 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
TEXT -3120 -232 Left 2 !.tran 0 1500m 0 50u
TEXT -3008 96 Left 2 ;David Pilling 2015