Version 4
SHEET 1 1168 680
WIRE -32 -144 -144 -144
WIRE 112 -144 -32 -144
WIRE 288 -144 112 -144
WIRE -144 -128 -144 -144
WIRE 112 -128 112 -144
WIRE -32 -80 -32 -144
WIRE -144 -32 -144 -48
WIRE -96 -32 -144 -32
WIRE -144 -16 -144 -32
WIRE -144 80 -144 64
WIRE -32 96 -32 16
WIRE 144 96 -32 96
WIRE -144 160 -144 144
WIRE -144 160 -416 160
WIRE -144 176 -144 160
WIRE 112 176 112 -48
WIRE 112 176 -32 176
WIRE 288 224 288 -144
WIRE -144 256 -144 240
WIRE 144 272 144 96
WIRE -32 304 -32 176
WIRE -416 320 -416 160
WIRE -144 352 -144 336
WIRE -96 352 -144 352
WIRE -144 368 -144 352
WIRE -416 464 -416 400
WIRE -144 464 -144 448
WIRE -144 464 -416 464
WIRE -32 464 -32 400
WIRE -32 464 -144 464
WIRE 144 464 144 352
WIRE 144 464 -32 464
WIRE 288 464 288 304
WIRE 288 464 144 464
WIRE 288 480 288 464
FLAG 288 480 0
SYMBOL pnp -96 16 M180
SYMATTR InstName Q3
SYMATTR Value BC327-40
SYMBOL npn -96 304 R0
SYMATTR InstName Q4
SYMATTR Value BC337-40
SYMBOL voltage 288 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -416 304 R0
WINDOW 3 -71 186 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value SINE(6 6 750)
SYMATTR InstName V2
SYMBOL zener -128 144 R180
WINDOW 0 -43 32 Left 2
WINDOW 3 55 43 Left 2
SYMATTR InstName D2
SYMATTR Value BZX84C8V2L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL zener -128 240 R180
WINDOW 0 -36 30 Left 2
WINDOW 3 45 21 Left 2
SYMATTR InstName D1
SYMATTR Value BZX84C8V2L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -160 -32 R0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL res -128 352 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res -160 -144 R0
SYMATTR InstName R7
SYMATTR Value 5k
SYMBOL res -160 352 R0
SYMATTR InstName R8
SYMATTR Value 5k
SYMBOL res 96 -144 R0
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL res 128 256 R0
SYMATTR InstName R4
SYMATTR Value 50
TEXT -392 440 Left 2 !.tran 3m