Version 4 SHEET 1 880 680 WIRE 96 -192 -144 -192 WIRE 240 -192 96 -192 WIRE -144 -80 -144 -192 WIRE 96 -80 96 -112 WIRE 240 -48 240 -192 WIRE 96 0 96 -16 WIRE 176 0 96 0 WIRE -144 96 -144 0 WIRE -144 96 -176 96 WIRE 240 144 240 128 WIRE 528 144 240 144 WIRE 240 176 240 144 WIRE 528 176 528 144 WIRE 96 192 96 80 WIRE 96 192 0 192 WIRE 0 208 0 192 WIRE 96 224 96 192 WIRE 528 272 528 256 WIRE 176 304 96 304 WIRE -144 320 -144 96 WIRE 96 320 96 304 WIRE 96 400 96 384 WIRE -144 496 -144 400 WIRE 96 496 96 480 WIRE 96 496 -144 496 WIRE 240 496 240 352 WIRE 240 496 96 496 FLAG 0 288 0 FLAG 528 272 0 FLAG -176 96 0 SYMBOL res 80 -208 R0 SYMATTR InstName R1 SYMATTR Value 100 SYMBOL res 80 -16 R0 SYMATTR InstName R2 SYMATTR Value 560 SYMBOL res 80 208 R0 SYMATTR InstName R3 SYMATTR Value 560 SYMBOL res 80 384 R0 SYMATTR InstName R4 SYMATTR Value 100 SYMBOL npn 176 256 R0 SYMATTR InstName Q1 SYMATTR Value BD131 SYMBOL pnp 176 48 M180 SYMATTR InstName Q2 SYMATTR Value BD132 SYMBOL voltage 0 192 R0 WINDOW 3 -116 -32 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value SINE(0 1 1k) SYMATTR InstName V1 SYMBOL voltage -144 -96 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL voltage -144 304 R0 SYMATTR InstName V3 SYMATTR Value 5 SYMBOL res 224 32 R0 SYMATTR InstName R5 SYMATTR Value 0.1 SYMBOL res 224 160 R0 SYMATTR InstName R6 SYMATTR Value 0.1 SYMBOL res 512 160 R0 SYMATTR InstName R7 SYMATTR Value 10 SYMBOL diode 80 -80 R0 SYMATTR InstName D1 SYMATTR Value 1N914 SYMBOL diode 80 320 R0 SYMATTR InstName D2 SYMATTR Value 1N914 TEXT -304 -152 Left 2 !.tran 10m