Version 4 SHEET 1 880 680 WIRE 320 -368 256 -368 WIRE 544 -368 400 -368 WIRE 256 -304 256 -368 WIRE 544 -304 544 -368 WIRE 544 -304 384 -304 WIRE 384 -256 384 -304 WIRE 544 -192 544 -304 WIRE 384 -144 384 -176 WIRE 480 -144 384 -144 WIRE 384 -128 384 -144 WIRE 544 -32 544 -96 WIRE 544 -32 288 -32 WIRE 640 -32 544 -32 WIRE 736 -32 704 -32 WIRE 384 -16 384 -64 WIRE 288 16 288 -32 WIRE 544 32 544 -32 WIRE 736 48 736 -32 WIRE 384 80 384 48 WIRE 480 80 384 80 WIRE 48 128 -96 128 WIRE 176 128 112 128 WIRE 288 128 288 96 WIRE 288 128 256 128 WIRE 320 128 288 128 WIRE 736 176 736 128 WIRE -96 192 -96 128 WIRE 384 240 384 176 WIRE 544 240 544 128 WIRE -96 336 -96 272 FLAG 384 240 0 FLAG 544 240 0 FLAG 256 -304 0 FLAG -96 336 0 FLAG -96 128 in FLAG 736 -32 out FLAG 736 176 0 SYMBOL voltage -96 176 R0 WINDOW 123 24 124 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value2 AC 1 0 SYMATTR InstName V1 SYMATTR Value SINE(0 0.5V 1k) SYMBOL cap 112 112 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 0.47µ SYMBOL res 272 112 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res 272 0 R0 SYMATTR InstName R2 SYMATTR Value 200k SYMBOL npn 320 80 R0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL diode 368 -16 R0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 368 -128 R0 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL res 368 -272 R0 SYMATTR InstName R3 SYMATTR Value 700 SYMBOL npn 480 -192 R0 SYMATTR InstName Q2 SYMATTR Value 2N4401 SYMBOL pnp 480 128 M180 SYMATTR InstName 2N4403 SYMBOL cap 704 -48 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 470µ SYMBOL voltage 416 -368 R90 WINDOW 0 -32 56 VBottom 2 WINDOW 3 32 56 VTop 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 12V SYMBOL res 720 32 R0 SYMATTR InstName R5 SYMATTR Value 30 TEXT -128 360 Left 2 !.tran 0 1m 0 1u