Version 4
SHEET 1 880 680
WIRE 368 -144 176 -144
WIRE 464 -144 368 -144
WIRE 368 -128 368 -144
WIRE 176 -112 176 -144
WIRE 464 -64 464 -144
WIRE 176 -16 176 -32
WIRE 368 -16 368 -48
WIRE 384 -16 368 -16
WIRE 400 -16 384 -16
WIRE 368 32 368 -16
WIRE 464 80 464 32
WIRE 496 80 464 80
WIRE 208 96 176 96
WIRE 256 96 208 96
WIRE 320 96 256 96
WIRE 176 128 176 96
WIRE 368 128 352 128
WIRE 256 144 256 96
WIRE 368 144 368 128
WIRE 464 144 464 80
WIRE 176 256 176 208
WIRE 256 256 256 224
WIRE 256 256 176 256
WIRE 368 256 368 224
WIRE 368 256 256 256
WIRE 464 256 464 224
WIRE 464 256 368 256
WIRE 176 272 176 256
FLAG 176 272 0
FLAG 496 80 out
FLAG 208 96 G
FLAG 384 -16 B
FLAG 352 128 S
FLAG 176 -16 0
SYMBOL current 176 208 R180
WINDOW 0 24 80 Left 2
WINDOW 3 11 -91 Right 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName I1
SYMATTR Value PULSE(0 50u 1u 10n 10n 3u 20u)
SYMBOL res 240 128 R0
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL voltage 176 -128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 352 128 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL njf 320 32 R0
SYMATTR InstName J1
SYMATTR Value Jmmbf4391
SYMBOL pnp 400 32 M180
SYMATTR InstName Q1
SYMATTR Value BC557C
SYMBOL res 448 128 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res 352 -144 R0
SYMATTR InstName R3
SYMATTR Value 1k
TEXT 128 -168 Left 2 !.tran 6u
TEXT 128 -192 Left 2 !.lib MMBF4391.LIB
TEXT 128 -216 Left 2 ;.lib http://www.onsemi.com/pub/Collateral/MMBF4391.LIB
TEXT 128 -232 Left 2 ;.ferret http://www.onsemi.com/pub/Collateral/MMBF4391LT1-D.PDF