Version 4 SHEET 1 888 680 WIRE -464 -320 -528 -320 WIRE -48 -320 -320 -320 WIRE 96 -320 -48 -320 WIRE 256 -320 96 -320 WIRE 464 -320 256 -320 WIRE -464 -288 -464 -320 WIRE -448 -288 -464 -288 WIRE 256 -288 256 -320 WIRE -48 -272 -48 -320 WIRE 96 -272 96 -320 WIRE -464 -240 -464 -288 WIRE -384 -192 -384 -208 WIRE -528 -176 -528 -320 WIRE 528 -176 384 -176 WIRE -48 -160 -48 -192 WIRE 96 -160 96 -192 WIRE 560 -160 512 -160 WIRE 720 -160 560 -160 WIRE 752 -160 720 -160 WIRE 384 -128 384 -176 WIRE 560 -128 560 -160 WIRE 720 -128 720 -160 WIRE -112 -112 -128 -112 WIRE 176 -112 160 -112 WIRE -384 -80 -384 -112 WIRE -368 -80 -384 -80 WIRE -528 -64 -528 -112 WIRE -464 -64 -464 -160 WIRE -464 -64 -528 -64 WIRE -432 -64 -464 -64 WIRE -368 -64 -368 -80 WIRE -208 -64 -208 -208 WIRE -128 -48 -128 -112 WIRE -48 -48 -48 -64 WIRE -48 -48 -128 -48 WIRE 176 -48 176 -112 WIRE 176 -48 -48 -48 WIRE -432 -32 -432 -64 WIRE -144 -32 -176 -32 WIRE 464 -32 464 -320 WIRE 528 -32 528 -176 WIRE 560 -32 560 -48 WIRE 560 -32 528 -32 WIRE 720 -32 720 -64 WIRE 96 -16 96 -64 WIRE 240 -16 96 -16 WIRE 272 -16 240 -16 WIRE 384 -16 384 -48 WIRE 384 -16 352 -16 WIRE 432 -16 384 -16 WIRE 560 -16 560 -32 WIRE -48 0 -48 -48 WIRE 96 0 96 -16 WIRE 512 0 512 -160 WIRE 512 0 496 0 WIRE 240 16 240 -16 WIRE 432 16 416 16 WIRE -464 32 -464 -64 WIRE -368 32 -368 16 WIRE -368 32 -464 32 WIRE -208 48 -208 0 WIRE -144 48 -144 -32 WIRE -144 48 -208 48 WIRE -112 48 -144 48 WIRE 176 48 160 48 WIRE -208 64 -208 48 WIRE 560 64 560 48 WIRE -464 96 -464 32 WIRE -144 112 -144 48 WIRE -320 128 -320 -320 WIRE 176 128 176 48 WIRE 240 128 240 96 WIRE 240 128 176 128 WIRE 416 128 416 16 WIRE 416 128 240 128 WIRE 640 128 608 128 WIRE 720 128 720 48 WIRE 720 128 640 128 WIRE -528 144 -528 -64 WIRE -48 144 -48 96 WIRE 96 144 96 96 WIRE -208 160 -208 144 WIRE -208 160 -288 160 WIRE 640 160 640 128 WIRE 240 176 240 128 WIRE 720 176 720 128 WIRE 320 192 288 192 WIRE 464 192 464 32 WIRE 464 192 400 192 WIRE -464 208 -464 176 WIRE -432 208 -464 208 WIRE 464 224 464 192 WIRE 560 224 560 160 WIRE 560 224 528 224 WIRE -320 240 -320 192 WIRE -144 240 -144 192 WIRE 176 240 176 128 WIRE 176 240 -144 240 WIRE 528 240 528 224 WIRE -528 272 -528 208 WIRE -464 272 -464 208 WIRE -464 272 -528 272 WIRE -48 272 -48 224 WIRE 96 272 96 224 WIRE 96 272 -48 272 WIRE 288 272 288 192 WIRE 288 272 96 272 WIRE 560 272 560 224 WIRE 640 272 640 240 WIRE 640 272 560 272 WIRE 720 272 720 240 WIRE 720 272 640 272 FLAG 240 176 0 FLAG -208 -208 Tri IOPIN -208 -208 In FLAG 752 -160 Sen IOPIN 752 -160 Out FLAG 464 224 V- IOPIN 464 224 In FLAG 256 -288 V+ IOPIN 256 -288 In FLAG -320 240 V- IOPIN -320 240 In FLAG 528 240 0 FLAG -384 -208 Tri IOPIN -384 -208 Out FLAG -432 208 V- IOPIN -432 208 Out FLAG -432 -32 0 FLAG -448 -288 V+ IOPIN -448 -288 Out SYMBOL npn2 -112 0 R0 WINDOW 0 0 4 Left 0 WINDOW 3 27 48 Left 0 SYMATTR InstName Q1 SYMATTR Value 2N5210 SYMBOL pnp2 160 -64 R180 WINDOW 0 -4 91 Left 0 WINDOW 3 21 48 Left 0 SYMATTR InstName Q2 SYMATTR Value BC560B SYMBOL pnp2 -112 -64 M180 WINDOW 0 -1 92 Left 0 WINDOW 3 21 48 Left 0 SYMATTR InstName Q3 SYMATTR Value BC560B SYMBOL npn2 160 0 M0 WINDOW 0 -3 2 Left 0 WINDOW 3 24 50 Left 0 SYMATTR InstName Q4 SYMATTR Value 2N5210 SYMBOL res -64 -288 R0 SYMATTR InstName R1 SYMATTR Value 4K7 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 80 -288 R0 SYMATTR InstName R2 SYMATTR Value 4K7 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res -64 128 R0 SYMATTR InstName R3 SYMATTR Value 47 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 80 128 R0 SYMATTR InstName R4 SYMATTR Value 47 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res -160 96 R0 SYMATTR InstName R5 SYMATTR Value 100 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 224 0 R0 WINDOW 0 -37 31 Left 0 WINDOW 3 -39 64 Left 0 SYMATTR InstName R6 SYMATTR Value 100 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 368 -32 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R7 SYMATTR Value 4K7 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL Robertugo\\OPAMP5 464 -64 R0 WINDOW 0 -24 62 Left 0 WINDOW 38 -71 17 Left 0 SYMATTR InstName U1 SYMATTR SpiceModel TL051 SYMBOL res 368 -144 R0 WINDOW 0 -37 34 Left 0 WINDOW 3 -38 63 Left 0 SYMATTR InstName R8 SYMATTR Value 10k SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL Robertugo\\pote -304 96 M0 WINDOW 0 26 11 Left 0 WINDOW 123 -52 92 Center 0 WINDOW 3 -59 122 Center 0 SYMATTR InstName Simet1 SYMATTR Value2 Set=.42 SYMATTR Value Rv=10k SYMBOL Robertugo\\pote -192 -96 M0 WINDOW 0 24 -12 Left 0 WINDOW 123 79 14 Center 0 WINDOW 3 80 38 Center 0 SYMATTR InstName Forma1 SYMATTR Value Rv=5k SYMBOL res -192 160 R180 WINDOW 0 45 102 Bottom 0 WINDOW 3 46 33 Top 0 SYMATTR InstName R9 SYMATTR Value 47K SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 416 176 R90 WINDOW 0 17 111 VBottom 0 WINDOW 3 -11 -4 VTop 0 SYMATTR InstName R10 SYMATTR Value 10K SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL njf 608 64 M0 WINDOW 0 57 22 Left 0 WINDOW 3 23 49 Left 0 SYMATTR InstName J1 SYMATTR Value BF245A SYMBOL res 544 -144 R0 WINDOW 0 25 47 Left 0 WINDOW 3 25 89 Left 0 SYMATTR InstName R11 SYMATTR Value 180K SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 624 144 R0 WINDOW 0 -51 33 Left 0 WINDOW 3 -47 68 Left 0 SYMATTR InstName R12 SYMATTR Value 1e6 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL cap 704 176 R0 WINDOW 0 -20 10 Left 0 WINDOW 3 -24 57 Left 0 SYMATTR InstName C1 SYMATTR Value 1n SYMATTR SpiceLine V=16 Irms=0 Rser=0.007 MTBF=0 Lser=0 mfg="TDK" pn="C3216X7RIC105K" type="X7R" ppPkg=1 SYMBOL diode 736 -64 R180 WINDOW 0 79 54 Left 0 WINDOW 3 40 30 Left 0 SYMATTR InstName D1 SYMATTR Value 1N914 SYMBOL res 704 -48 R0 WINDOW 0 -62 35 Left 0 WINDOW 3 -62 64 Left 0 SYMATTR InstName R13 SYMATTR Value 10K SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL voltage -464 -256 R0 WINDOW 0 -42 3 Left 0 WINDOW 3 -16 57 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 23 91 VRight 0 SYMATTR InstName V1 SYMATTR Value 7.5 SYMATTR SpiceLine Rser=1 SYMBOL voltage -464 192 M180 WINDOW 0 -39 112 Left 0 WINDOW 3 -16 57 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 24 93 VRight 0 SYMATTR InstName V2 SYMATTR Value -7.5 SYMATTR SpiceLine Rser=1 SYMBOL voltage -384 -208 R0 WINDOW 0 4 106 Left 0 WINDOW 3 -16 57 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 4 134 Left 0 SYMATTR InstName V3 SYMATTR Value PULSE(0 {Vt} 0 1u 1u 0 2u) SYMBOL cap -544 -176 R0 WINDOW 3 22 71 Left 0 SYMATTR Value 50n SYMATTR InstName C2 SYMBOL cap -544 144 R0 WINDOW 0 20 52 Left 0 WINDOW 3 16 91 Left 0 SYMATTR InstName C3 SYMATTR Value 50n SYMBOL cap 544 -16 R0 WINDOW 0 -20 10 Left 0 WINDOW 3 -24 57 Left 0 SYMATTR InstName C4 SYMATTR Value 1n SYMATTR SpiceLine V=16 Irms=0 Rser=0.007 MTBF=0 Lser=0 mfg="TDK" pn="C3216X7RIC105K" type="X7R" ppPkg=1 SYMBOL voltage -368 32 R180 WINDOW 0 -42 3 Left 0 WINDOW 3 -28 55 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 -26 202 VRight 0 SYMATTR InstName V4 SYMATTR Value {Vt/2} SYMATTR SpiceLine Rser=1 TEXT 486 -302 Left 0 !.tran 0 150u 140u TEXT 488 -272 Left 0 !.step param Vt List 1 2 TEXT 488 -232 Left 0 !.four 0.5meg V(Sen) TEXT 280 -296 Left 0 !.option noopiter