Version 4 SHEET 1 964 836 WIRE -80 48 -704 48 WIRE 32 48 -80 48 WIRE 144 48 32 48 WIRE -80 80 -80 48 WIRE 32 112 32 48 WIRE 144 160 144 48 WIRE -416 208 -560 208 WIRE -336 208 -416 208 WIRE -288 208 -336 208 WIRE -192 208 -208 208 WIRE -80 208 -80 160 WIRE -80 208 -128 208 WIRE 32 208 32 176 WIRE 32 208 -80 208 WIRE 80 208 32 208 WIRE -560 224 -560 208 WIRE -416 224 -416 208 WIRE 32 256 32 208 WIRE 144 288 144 256 WIRE -336 304 -336 208 WIRE -288 304 -336 304 WIRE -112 304 -208 304 WIRE -704 320 -704 48 WIRE -416 336 -416 304 WIRE -560 352 -560 304 WIRE 32 368 32 336 WIRE 144 400 144 368 WIRE 288 400 144 400 WIRE -112 416 -112 304 WIRE -32 416 -112 416 WIRE 144 416 144 400 WIRE -112 432 -112 416 WIRE -704 512 -704 400 WIRE -560 512 -560 432 WIRE -560 512 -704 512 WIRE -416 512 -416 416 WIRE -416 512 -560 512 WIRE -112 512 -112 496 WIRE -112 512 -416 512 WIRE 32 512 32 464 WIRE 32 512 -112 512 WIRE 144 512 144 496 WIRE 144 512 32 512 WIRE -704 544 -704 512 FLAG -704 544 0 SYMBOL voltage -704 304 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12V SYMBOL voltage -560 336 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -83 200 Left 0 SYMATTR InstName V2 SYMATTR Value PULSE(0 24 0 50u 50u 50u 5m 10) SYMBOL res -192 192 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 22k SYMBOL voltage -416 320 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -141 249 Left 0 SYMATTR InstName V3 SYMATTR Value PULSE(0 -24 500u 50u 50u 50u 5m 10) SYMBOL res -432 208 R0 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL res -576 208 R0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL pnp 80 256 M180 SYMATTR InstName Q1 SYMATTR Value BC557B SYMBOL cap -128 192 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 1µ SYMBOL res -96 64 R0 SYMATTR InstName R2 SYMATTR Value 22k SYMBOL res 128 272 R0 SYMATTR InstName R5 SYMATTR Value 1k5 SYMBOL res 128 400 R0 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL diode 48 176 R180 WINDOW 0 -28 87 Left 0 WINDOW 3 -76 61 Left 0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL npn -32 368 R0 SYMATTR InstName Q2 SYMATTR Value BC547B SYMBOL res -192 288 R90 WINDOW 0 6 56 VBottom 0 WINDOW 3 26 56 VTop 0 SYMATTR InstName R7 SYMATTR Value 22k SYMBOL res 16 240 R0 SYMATTR InstName R8 SYMATTR Value 10k SYMBOL diode -128 496 M180 WINDOW 0 -28 87 Left 0 WINDOW 3 -76 61 Left 0 SYMATTR InstName D2 SYMATTR Value 1N4148 TEXT -736 568 Left 0 !.tran 7m