Version 4
SHEET 1 880 680
WIRE 288 16 176 16
WIRE 384 16 288 16
WIRE 528 16 384 16
WIRE 656 16 528 16
WIRE 176 32 176 16
WIRE 288 32 288 16
WIRE 528 32 528 16
WIRE 384 48 384 16
WIRE 80 128 16 128
WIRE 176 128 176 112
WIRE 176 128 144 128
WIRE 528 128 528 112
WIRE 560 128 528 128
WIRE 176 144 176 128
WIRE 528 144 528 128
WIRE 16 160 16 128
WIRE 288 192 288 112
WIRE 288 192 240 192
WIRE 384 192 384 112
WIRE 384 192 288 192
WIRE 464 192 448 192
WIRE 288 208 288 192
WIRE 384 224 384 192
WIRE 176 256 176 240
WIRE 240 256 176 256
WIRE 176 272 176 256
WIRE 656 272 656 16
WIRE 16 368 16 240
WIRE 176 368 176 352
WIRE 288 368 288 288
WIRE 384 368 384 288
WIRE 528 368 528 240
WIRE 656 368 656 352
WIRE 240 400 240 256
WIRE 448 400 448 192
WIRE 448 400 240 400
FLAG 16 368 0
FLAG 176 368 0
FLAG 288 368 0
FLAG 384 368 0
FLAG 528 368 0
FLAG 656 368 0
FLAG 560 128 Output
SYMBOL voltage 16 144 R0
WINDOW 3 -27 57 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value AC 1.
SYMBOL cap 80 144 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL pnp 240 240 R180
WINDOW 0 67 25 Left 2
WINDOW 3 54 48 Left 2
SYMATTR InstName Q1
SYMATTR Value 2N2907
SYMBOL pnp 464 240 M180
WINDOW 0 62 26 Left 2
WINDOW 3 38 54 Left 2
SYMATTR InstName Q2
SYMATTR Value 2N2907
SYMBOL res 160 16 R0
SYMATTR InstName R1
SYMATTR Value 2k
SYMBOL res 272 16 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 512 16 R0
SYMATTR InstName R3
SYMATTR Value 1.5k
SYMBOL res 272 192 R0
SYMATTR InstName R4
SYMATTR Value 7.5k
SYMBOL res 160 256 R0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL voltage 656 256 R0
WINDOW 0 -37 8 Left 2
WINDOW 3 -22 58 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12V
SYMBOL cap 368 224 R0
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL cap 368 48 R0
SYMATTR InstName C3
SYMATTR Value 100n
TEXT -18 406 Left 2 !.ac oct 1000 1k 100Meg