Version 4 SHEET 1 880 680 WIRE 128 -240 -320 -240 WIRE 400 -240 128 -240 WIRE 128 -208 128 -240 WIRE 128 -96 128 -128 WIRE 128 -96 -144 -96 WIRE 128 -48 128 -96 WIRE -320 -16 -320 -240 WIRE 400 32 400 -240 WIRE -144 48 -144 -96 WIRE -320 96 -320 64 WIRE -32 96 -32 64 WIRE -32 96 -80 96 WIRE 128 96 128 32 WIRE 128 96 -32 96 WIRE -32 128 -32 96 WIRE 128 128 128 96 WIRE -144 176 -144 144 WIRE 208 176 192 176 WIRE 288 176 272 176 WIRE 400 176 400 112 WIRE 400 176 288 176 WIRE 400 208 400 176 WIRE -32 224 -32 192 WIRE 288 256 288 176 WIRE 128 304 128 224 WIRE 224 304 128 304 WIRE 400 320 400 288 WIRE 288 384 288 352 FLAG 288 384 0 FLAG -32 224 0 FLAG -320 96 0 FLAG 400 320 0 FLAG -32 64 Out FLAG -144 176 0 SYMBOL pnp 192 224 R180 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL npn 224 256 R0 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL res 112 -224 R0 SYMATTR InstName R1 SYMATTR Value 56k SYMBOL cap -48 128 R0 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL voltage -320 -32 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL res 384 16 R0 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL res 384 192 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res 112 -64 R0 SYMATTR InstName R4 SYMATTR Value 56k SYMBOL pnp -80 144 R180 SYMATTR InstName Q3 SYMATTR Value 2N3906 SYMBOL diode 208 192 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value 1N4148 TEXT -256 408 Left 0 !.tran 0 250m 0 50u uic