Version 4
SHEET 1 2184 692
WIRE 256 144 160 144
WIRE 384 144 256 144
WIRE 544 144 384 144
WIRE 672 144 544 144
WIRE 816 144 672 144
WIRE 976 144 816 144
WIRE 1296 144 976 144
WIRE 160 160 160 144
WIRE 160 160 128 160
WIRE 1296 160 1296 144
WIRE 544 192 544 144
WIRE 816 208 816 144
WIRE 672 224 672 144
WIRE 976 224 976 144
WIRE 1248 224 1200 224
WIRE 480 240 448 240
WIRE 1200 272 1200 224
WIRE 384 288 384 144
WIRE 576 288 544 288
WIRE 1344 336 1344 224
WIRE 576 352 576 288
WIRE 816 352 816 288
WIRE 1200 384 1200 352
WIRE 1280 384 1200 384
WIRE 976 400 976 304
WIRE 976 400 880 400
WIRE 160 416 160 160
WIRE 256 416 256 144
WIRE 448 432 448 336
WIRE 976 448 976 400
WIRE 1200 464 1200 384
WIRE 576 480 576 432
WIRE 672 480 672 304
WIRE 672 480 576 480
WIRE 1344 496 1344 432
WIRE 576 512 576 480
WIRE 160 624 160 480
WIRE 256 624 256 496
WIRE 256 624 160 624
WIRE 448 624 448 512
WIRE 448 624 256 624
WIRE 576 624 576 592
WIRE 576 624 448 624
WIRE 816 624 816 448
WIRE 816 624 576 624
WIRE 976 624 976 512
WIRE 976 624 816 624
WIRE 1200 624 1200 528
WIRE 1200 624 976 624
WIRE 1344 624 1344 576
WIRE 1344 624 1200 624
WIRE 256 656 256 624
FLAG 256 656 0
FLAG 128 160 inside_cell
IOPIN 128 160 Out
SYMBOL npn 880 352 M0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 384 240 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL pnp2 480 192 R0
SYMATTR InstName Q3
SYMATTR Value 2N3906
SYMBOL cap 960 448 R0
SYMATTR InstName C1
SYMATTR Value 1µf
SYMATTR SpiceLine V=10 Irms=0 Rser=0.009 Lser=0
SYMBOL polcap 144 416 R0
WINDOW 3 24 64 Left 0
SYMATTR Value 1µf
SYMATTR InstName C2
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=50 Irms=22m Rser=3.9 Lser=0
SYMBOL res 240 400 R0
SYMATTR InstName R1
SYMATTR Value 500k
SYMBOL res 432 416 R0
SYMATTR InstName R2
SYMATTR Value 200k
SYMBOL voltage 576 496 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL res 960 208 R0
SYMATTR InstName R5
SYMATTR Value 2e5
SYMBOL npn 1280 336 R0
SYMATTR InstName Q6
SYMATTR Value 2N3904
SYMBOL cap 1184 464 R0
SYMATTR InstName C4
SYMATTR Value 1µf
SYMBOL res 1184 256 R0
SYMATTR InstName R8
SYMATTR Value 5k
SYMBOL npn 1248 160 M90
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL res 656 208 R0
SYMATTR InstName R3
SYMATTR Value 2e6
SYMBOL res 1328 480 R0
SYMATTR InstName R4
SYMATTR Value 200
SYMBOL res 560 336 R0
SYMATTR InstName R6
SYMATTR Value 500
SYMBOL res 800 192 R0
SYMATTR InstName R7
SYMATTR Value 100
TEXT 424 648 Left 0 !.tran 0 0.5 .120 .0001
TEXT 480 112 Left 0 ;Fast inward
TEXT 832 112 Left 0 ;Slow outward
TEXT 104 112 Left 0 ;Passive membrane RC
TEXT 1160 112 Left 0 ;Fast outward