Version 4 SHEET 1 896 688 WIRE -320 -112 -320 -128 WIRE -320 -16 -320 -32 WIRE -96 -16 -320 -16 WIRE -320 0 -320 -16 WIRE -96 0 -96 -16 WIRE 240 0 128 0 WIRE 432 0 320 0 WIRE -320 80 -320 64 WIRE -96 96 -96 64 WIRE 128 96 128 0 WIRE 128 96 -96 96 WIRE 256 96 128 96 WIRE 432 96 432 0 WIRE 432 96 320 96 WIRE -96 128 -96 96 WIRE -320 160 -320 144 WIRE 480 160 304 160 WIRE 192 208 192 192 WIRE -272 224 -496 224 WIRE -96 224 -96 192 WIRE -96 224 -192 224 WIRE 96 224 96 208 WIRE 96 224 -96 224 WIRE 160 224 96 224 WIRE -496 240 -496 224 WIRE 304 240 304 160 WIRE 304 240 224 240 WIRE 336 240 304 240 WIRE 432 240 432 96 WIRE 432 240 416 240 WIRE 656 240 432 240 WIRE 160 256 128 256 WIRE 432 272 432 240 WIRE 656 272 656 240 WIRE 192 288 192 272 WIRE -496 336 -496 320 WIRE 32 352 16 352 WIRE 128 352 128 256 WIRE 128 352 112 352 WIRE 176 352 128 352 WIRE 304 352 304 240 WIRE 304 352 240 352 WIRE 304 368 304 352 WIRE 432 368 432 336 WIRE 544 368 432 368 WIRE 656 368 656 336 WIRE 656 368 608 368 WIRE 432 400 432 368 WIRE 656 400 656 368 WIRE -96 416 -96 224 WIRE 16 464 -32 464 WIRE 304 464 304 448 WIRE 304 464 16 464 WIRE 16 480 16 464 WIRE 304 480 304 464 WIRE 432 480 432 464 WIRE 656 480 656 464 WIRE -416 512 -416 480 WIRE -288 512 -288 480 WIRE -96 528 -96 512 WIRE 16 560 16 544 WIRE 304 560 304 544 WIRE -416 624 -416 592 WIRE -288 624 -288 592 FLAG -288 624 0 FLAG 192 192 +V FLAG -288 480 +V FLAG 192 288 -V FLAG -416 624 0 FLAG -416 480 -V FLAG 432 480 0 FLAG 656 480 0 FLAG 96 144 0 FLAG -320 160 0 FLAG -320 -128 +V FLAG 16 352 0 FLAG -496 336 0 FLAG 16 560 0 FLAG 304 560 0 FLAG -96 528 -V FLAG 480 160 OUT FLAG -496 224 IN SYMBOL voltage -288 496 R0 SYMATTR InstName V1 SYMATTR Value 15 SYMBOL voltage -416 496 R0 SYMATTR InstName V2 SYMATTR Value -15 SYMBOL opamps\\LT1055 192 176 R0 SYMATTR InstName U2 SYMBOL cap 240 336 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 33p SYMBOL res 320 256 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R3 SYMATTR Value 1.5K SYMBOL diode 416 336 M180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 416 400 R0 WINDOW 3 28 63 Left 0 SYMATTR Value 1N4148 SYMATTR InstName D2 SYMBOL diode 640 272 R0 SYMATTR InstName D3 SYMATTR Value 1N4148 SYMBOL diode 640 464 M180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D4 SYMATTR Value 1N4148 SYMBOL zener 544 384 R270 WINDOW 0 36 32 VTop 0 WINDOW 3 -4 32 VBottom 0 SYMATTR InstName D5 SYMATTR Value LM329 SYMBOL cap 320 80 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value .001µ SYMBOL res 336 -16 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 3Meg SYMBOL cap 80 208 M180 WINDOW 0 36 49 Left 0 WINDOW 3 24 8 Left 0 SYMATTR InstName C3 SYMATTR Value .1µ SYMBOL diode -112 192 M180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D6 SYMATTR Value 1N4148 SYMBOL diode -112 64 M180 WINDOW 0 30 62 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D7 SYMATTR Value 1N4148 SYMBOL diode -336 80 R0 WINDOW 0 36 16 Left 0 WINDOW 3 23 61 Left 0 SYMATTR InstName D9 SYMATTR Value 1N4148 SYMBOL res -336 -128 R0 SYMATTR InstName R2 SYMATTR Value 4.7K SYMBOL res 128 336 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 22K SYMBOL diode -336 0 R0 WINDOW 0 36 16 Left 0 WINDOW 3 23 61 Left 0 SYMATTR InstName D8 SYMATTR Value 1N4148 SYMBOL res -176 208 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R5 SYMATTR Value 75K SYMBOL pnp -32 512 R180 WINDOW 0 51 110 Right 0 WINDOW 3 40 46 Left 0 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL diode 0 480 R0 WINDOW 0 36 16 Left 0 WINDOW 3 23 61 Left 0 SYMATTR InstName D10 SYMATTR Value 1N4148 SYMBOL cap 288 480 R0 WINDOW 3 33 50 Left 0 SYMATTR Value .1µ SYMATTR InstName C4 SYMBOL res 288 352 R0 SYMATTR InstName R6 SYMATTR Value 3.3Meg SYMBOL voltage -496 224 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value PULSE(1 9 0 50m 50m 0 100m) TEXT 112 616 Left 0 !.model LM329 D(Ron=1 Vrev=6.95) TEXT 480 544 Left 0 !.tran 50m TEXT 104 -72 Bottom 0 ;1Hz to 10KHz Voltage-to-Frequency Converter