Version 4
SHEET 1 2020 904
WIRE 496 -400 -48 -400
WIRE 784 -400 496 -400
WIRE 944 -400 784 -400
WIRE 1072 -400 944 -400
WIRE 1296 -400 1072 -400
WIRE 784 -368 784 -400
WIRE 944 -352 944 -400
WIRE 1072 -352 1072 -400
WIRE 496 -288 496 -400
WIRE 1296 -272 1296 -400
WIRE 784 -240 784 -288
WIRE 784 -240 560 -240
WIRE 944 -224 944 -272
WIRE 1232 -224 944 -224
WIRE 944 -176 944 -224
WIRE 496 -160 496 -192
WIRE 784 -128 784 -240
WIRE 1072 -128 1072 -272
WIRE 1072 -128 1008 -128
WIRE 1168 -128 1072 -128
WIRE 432 -112 176 -112
WIRE 1296 -96 1296 -176
WIRE 1392 -96 1296 -96
WIRE 1296 -32 1296 -96
WIRE 496 -16 496 -64
WIRE 640 -16 496 -16
WIRE 1168 0 1168 -128
WIRE 640 16 640 -16
WIRE 784 16 784 -64
WIRE 832 16 784 16
WIRE 944 16 944 -80
WIRE 944 16 912 16
WIRE 496 80 496 -16
WIRE 784 80 784 16
WIRE 640 128 640 96
WIRE 640 128 560 128
WIRE 720 128 640 128
WIRE 1072 128 1072 -128
WIRE -48 304 -48 -400
WIRE 176 320 176 -112
WIRE 640 320 640 128
WIRE 496 368 496 176
WIRE 576 368 496 368
WIRE -48 480 -48 384
WIRE -48 480 -144 480
WIRE 176 480 176 400
WIRE 176 480 -48 480
WIRE 1072 480 1072 192
WIRE 1072 480 176 480
WIRE 1168 480 1168 64
WIRE 1168 480 1072 480
WIRE 1296 480 1296 48
WIRE 1296 480 1168 480
WIRE -144 512 -144 480
WIRE 496 544 496 368
WIRE -48 560 -48 480
WIRE -48 688 -48 640
WIRE 496 688 496 624
WIRE 496 688 -48 688
WIRE 640 688 640 416
WIRE 640 688 496 688
WIRE 784 688 784 176
WIRE 784 688 640 688
WIRE 1296 688 784 688
FLAG -144 512 0
FLAG 1392 -96 Out
SYMBOL voltage -48 288 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage -48 544 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL voltage 176 304 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 100m 1e7)
SYMATTR Value2 AC 1.
SYMBOL pnp 560 176 R180
SYMATTR InstName Q1
SYMATTR Value BC557C
SYMBOL pnp 576 416 M180
SYMATTR InstName Q2
SYMATTR Value BC557C
SYMBOL res 480 528 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 624 0 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL npn 432 -160 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL pnp 720 176 M180
SYMATTR InstName Q4
SYMATTR Value BC557C
SYMBOL npn 560 -288 M0
SYMATTR InstName Q5
SYMATTR Value 2N3904
SYMBOL res 768 -384 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL zener 800 -64 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N750
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 928 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 33
SYMBOL npn 1008 -176 M0
SYMATTR InstName Q7
SYMATTR Value 2N3904
SYMBOL res 928 -368 R0
SYMATTR InstName R5
SYMATTR Value 330
SYMBOL diode 1056 128 R0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res 1056 -368 R0
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL cap 1152 0 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL npn 1232 -272 R0
SYMATTR InstName Q6
SYMATTR Value 2N3904
SYMBOL res 1280 -48 R0
SYMATTR InstName R7
SYMATTR Value 1k
TEXT 88 616 Left 2 !.tran 5µ
TEXT 88 568 Left 2 !;ac dec 1k 100k 1e8