Version 4 SHEET 1 936 740 WIRE 416 -112 416 -128 WIRE 560 -112 560 -128 WIRE 720 -80 720 -128 WIRE 864 -80 720 -80 WIRE 720 -48 720 -80 WIRE 864 -48 864 -80 WIRE 416 0 416 -32 WIRE 560 0 560 -32 WIRE 720 64 720 32 WIRE 864 64 864 16 WIRE 864 64 720 64 WIRE 720 112 720 64 WIRE 352 128 352 112 WIRE 320 144 288 144 WIRE 464 160 384 160 WIRE 528 160 464 160 WIRE 656 160 608 160 WIRE -176 176 -192 176 WIRE 48 176 -176 176 WIRE 176 176 128 176 WIRE 320 176 176 176 WIRE 464 176 464 160 WIRE -192 208 -192 176 WIRE 176 208 176 176 WIRE 352 208 352 192 WIRE 288 272 288 144 WIRE 464 272 464 240 WIRE 464 272 288 272 WIRE 528 272 464 272 WIRE 720 272 720 208 WIRE 720 272 608 272 WIRE 720 288 720 272 WIRE -192 336 -192 288 WIRE 176 336 176 288 WIRE 720 400 720 368 WIRE 176 464 176 432 WIRE 432 480 256 480 WIRE 336 512 336 464 WIRE 256 528 256 480 WIRE 304 528 256 528 WIRE 432 544 432 480 WIRE 432 544 368 544 WIRE 496 544 432 544 WIRE 176 560 176 544 WIRE 176 560 64 560 WIRE 304 560 176 560 WIRE 64 576 64 560 WIRE 176 576 176 560 WIRE 336 592 336 576 WIRE 64 672 64 640 WIRE 176 672 176 656 FLAG 416 0 0 FLAG 560 0 0 FLAG 416 -128 +5V FLAG 560 -128 +12V FLAG 352 112 +5V FLAG -192 336 0 FLAG -176 176 in FLAG 720 400 0 FLAG 352 208 0 FLAG 720 -128 +12V FLAG 176 336 0 FLAG 336 464 +5V FLAG 336 592 0 FLAG 176 672 0 FLAG 176 432 +5V FLAG 64 672 0 FLAG 496 544 VREF SYMBOL xopamp_st2 352 96 R0 SYMATTR InstName U1 SYMATTR SpiceModel TS912 SYMBOL voltage 416 -128 R0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL voltage 560 -128 R0 SYMATTR InstName V2 SYMATTR Value 12 SYMBOL voltage -192 192 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value PWL(0 0 1 2.5) SYMBOL res 32 192 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 47k SYMBOL res 512 288 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R3 SYMATTR Value 4.7k SYMBOL res 704 272 R0 SYMATTR InstName RMESS SYMATTR Value 1 SYMBOL npn 656 112 R0 SYMATTR InstName Q1 SYMATTR Value BDX SYMBOL res 704 -64 R0 SYMATTR InstName RMOTOR SYMATTR Value 60 SYMBOL res 512 176 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R6 SYMATTR Value 220 SYMBOL cap 448 176 R0 SYMATTR InstName C1 SYMATTR Value 1n SYMBOL cap 848 -48 R0 SYMATTR InstName C2 SYMATTR Value 100µ SYMBOL res 160 192 R0 SYMATTR InstName R2 SYMATTR Value 4.7k SYMBOL xopamp_st2 336 480 R0 SYMATTR InstName U2 SYMATTR SpiceModel TS912 SYMBOL res 160 560 R0 SYMATTR InstName R4 SYMATTR Value 4.7k SYMBOL res 160 448 R0 SYMATTR InstName R5 SYMATTR Value 4.7k SYMBOL cap 48 576 R0 SYMATTR InstName C3 SYMATTR Value 0.1µ TEXT -256 -88 Left 2 !.tran 0 1 0 1m TEXT -256 -56 Left 2 !.options plotwinsize=0 TEXT -256 -120 Left 2 !.include ts912.txt TEXT -256 -16 Left 2 ;Use symbol xopamp_st2.asy TEXT -256 16 Left 2 !.model BDX NPN(BF=40) TEXT -208 104 Left 2 ;DAC 0...2.5V TEXT 472 504 Left 2 ;2.5V TEXT -256 -184 Left 4 ;Current Source 0 ... 273mA TEXT -136 456 Left 2 ;VREF LINE Normal -112 432 -112 384 2 RECTANGLE Normal 16 384 -256 80 2