Version 4
SHEET 1 880 680
WIRE -160 -16 -416 -16
WIRE 224 -16 -160 -16
WIRE 224 16 224 -16
WIRE 224 128 224 96
WIRE 224 128 112 128
WIRE -160 144 -160 -16
WIRE -192 160 -224 160
WIRE -80 176 -128 176
WIRE -48 176 -80 176
WIRE 48 176 32 176
WIRE 224 176 224 128
WIRE -192 192 -304 192
WIRE -80 224 -80 176
WIRE 160 224 112 224
WIRE -224 320 -224 160
WIRE -80 320 -80 288
WIRE -80 320 -224 320
WIRE 32 320 -80 320
WIRE 224 320 224 272
WIRE 224 320 112 320
WIRE -416 352 -416 -16
WIRE -304 352 -304 192
WIRE 224 352 224 320
WIRE -416 464 -416 432
WIRE -304 464 -304 432
WIRE -160 464 -160 208
WIRE 224 464 224 432
FLAG -160 464 0
FLAG -416 464 0
FLAG -304 464 0
FLAG 224 464 0
SYMBOL npn 160 176 R0
SYMATTR InstName Q1
SYMATTR Value FZT849
SYMBOL npn 48 128 R0
SYMATTR InstName Q2
SYMATTR Value BC337-40
SYMBOL res 128 304 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 208 336 R0
SYMATTR InstName R2
SYMATTR Value 0.1
SYMBOL res 208 0 R0
SYMATTR InstName R3
SYMATTR Value 1
SYMBOL res 48 160 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 2k2
SYMBOL Opamps\\opamp2 -160 112 R0
SYMATTR InstName U1
SYMATTR Value LM324
SYMBOL voltage -304 336 R0
WINDOW 3 57 -125 VRight 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0.4 0.5 0 1n 1n 10u 20u)
SYMBOL voltage -416 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 10V
SYMBOL cap -96 224 R0
SYMATTR InstName C1
SYMATTR Value {C1}
TEXT -136 16 Left 2 !.tran 50u
TEXT -136 40 Left 2 !.inc lm324-ns.mod
TEXT -136 64 Left 2 !.step param C1 list 0 33p 100p 1n