Version 4
SHEET 1 880 680
WIRE -224 272 -224 112
WIRE -192 112 -224 112
WIRE -192 128 -192 112
WIRE -192 224 -192 208
WIRE -192 288 -192 224
WIRE -192 400 -192 368
WIRE -176 224 -192 224
WIRE -160 112 -192 112
WIRE -160 272 -224 272
WIRE -160 304 -160 272
WIRE -112 176 -112 160
WIRE -112 288 -112 272
WIRE -112 304 -160 304
WIRE -112 400 -192 400
WIRE -112 400 -112 384
WIRE -96 288 -112 288
WIRE -48 160 -112 160
WIRE -48 160 -48 128
WIRE 0 160 -48 160
WIRE 0 288 -16 288
WIRE 0 304 0 288
WIRE 0 400 -112 400
WIRE 0 400 0 384
WIRE 0 448 0 400
WIRE 16 288 0 288
WIRE 112 160 80 160
WIRE 112 176 112 160
WIRE 112 288 96 288
WIRE 112 288 112 272
WIRE 144 160 112 160
WIRE 192 224 176 224
WIRE 192 288 192 224
WIRE 192 400 0 400
WIRE 192 400 192 368
WIRE 208 224 192 224
WIRE 320 224 288 224
WIRE 352 128 -48 128
WIRE 352 144 352 128
WIRE 352 192 352 144
WIRE 352 272 352 256
WIRE 384 112 -80 112
WIRE 384 208 384 112
WIRE 400 160 224 160
WIRE 400 240 400 160
WIRE 400 288 400 240
WIRE 400 400 192 400
WIRE 400 400 400 368
WIRE 416 208 384 208
WIRE 416 240 400 240
WIRE 432 112 384 112
WIRE 448 144 352 144
WIRE 448 192 448 144
WIRE 448 272 352 272
WIRE 448 272 448 256
WIRE 448 496 448 272
WIRE 464 160 464 144
WIRE 496 192 448 192
WIRE 496 288 496 192
WIRE 496 400 400 400
WIRE 496 400 496 368
WIRE 496 496 448 496
WIRE 496 496 496 480
WIRE 512 112 496 112
WIRE 512 160 464 160
WIRE 512 160 512 112
WIRE 512 224 480 224
WIRE 512 224 512 160
FLAG 0 448 0
SYMBOL Robertugo\\OPAMP5 448 160 R0
WINDOW 0 -25 64 Left 0
WINDOW 38 52 80 Left 0
SYMATTR InstName U1
SYMATTR SpiceModel TL082
SYMBOL npn2 -176 176 R0
WINDOW 0 55 20 Left 0
WINDOW 3 15 48 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N3391A
SYMBOL npn2 176 176 M0
WINDOW 0 55 20 Left 0
WINDOW 3 15 48 Left 0
SYMATTR InstName Q2
SYMATTR Value 2N3391A
SYMBOL res 0 272 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 39
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 112 272 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 39
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -16 288 R0
WINDOW 0 28 48 Left 0
WINDOW 3 27 81 Left 0
SYMATTR InstName R3
SYMATTR Value 3K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -208 272 R0
WINDOW 0 28 48 Left 0
WINDOW 3 27 81 Left 0
SYMATTR InstName R4
SYMATTR Value 680
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 176 272 R0
WINDOW 0 -48 29 Left 0
WINDOW 3 -48 64 Left 0
SYMATTR InstName R5
SYMATTR Value 4K7
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 96 144 R90
WINDOW 0 57 97 VBottom 0
WINDOW 3 31 51 VTop 0
SYMATTR InstName R6
SYMATTR Value 470
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 304 208 R90
WINDOW 0 60 91 VBottom 0
WINDOW 3 31 42 VTop 0
SYMATTR InstName R7
SYMATTR Value 15K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Robertugo\\Pote 336 160 R0
WINDOW 0 -50 48 Left 0
WINDOW 123 -20 120 Center 0
WINDOW 3 -33 18 Center 0
SYMATTR InstName U2
SYMATTR Value Rv=50K
SYMBOL res 240 144 R90
WINDOW 0 59 57 VBottom 0
WINDOW 3 31 14 VTop 0
SYMATTR InstName R8
SYMATTR Value 18K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -208 112 R0
WINDOW 0 37 47 Left 0
WINDOW 3 32 71 Left 0
SYMATTR InstName R9
SYMATTR Value 1K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Robertugo\\Pote 528 128 M270
WINDOW 0 -15 23 VRight 0
WINDOW 123 51 133 VCenter 0
WINDOW 3 51 29 VCenter 0
SYMATTR InstName U3
SYMATTR Value Rv=5K
SYMBOL res 384 272 R0
WINDOW 0 -38 34 Left 0
WINDOW 3 -36 63 Left 0
SYMATTR InstName R10
SYMATTR Value 22K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 496 384 R0
WINDOW 0 -42 98 Left 0
WINDOW 3 -16 57 Left 0
WINDOW 123 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 7.5
SYMATTR SpiceLine Rser=.1 Cpar=100n
SYMBOL voltage 496 272 R0
WINDOW 0 -35 102 Left 0
WINDOW 3 -16 57 Left 0
WINDOW 123 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 7.5
SYMATTR SpiceLine Rser=.1 Cpar=100n
SYMBOL voltage -112 288 R0
WINDOW 0 -15 60 Left 0
WINDOW 3 45 95 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 4 0 .5m .5m 0 1m)
SYMBOL res -64 96 R90
WINDOW 0 59 57 VBottom 0
WINDOW 3 31 14 VTop 0
SYMATTR InstName R11
SYMATTR Value 100
SYMATTR SpiceLine tol=1 pwr=0.1
TEXT 48 432 Left 0 !.tran 0 10m 5u