Version 4 SHEET 1 3980 2984 WIRE 1344 1760 1056 1760 WIRE 2064 1760 1344 1760 WIRE 1056 1904 1056 1760 WIRE 1344 1904 1344 1760 WIRE 2064 1968 2064 1760 WIRE 1056 2000 1056 1904 WIRE 1344 2032 1344 1984 WIRE 1680 2032 1344 2032 WIRE 1792 2048 1744 2048 WIRE 1952 2048 1872 2048 WIRE 2016 2048 1952 2048 WIRE 1680 2064 1600 2064 WIRE 1952 2128 1952 2048 WIRE 1952 2128 1840 2128 WIRE 1344 2144 1344 2032 WIRE 1056 2160 1056 2080 WIRE 1840 2176 1840 2128 WIRE 1952 2192 1952 2128 WIRE 1840 2320 1840 2256 WIRE 1840 2320 1744 2320 WIRE 1952 2320 1952 2256 WIRE 1952 2320 1840 2320 WIRE 2064 2320 2064 2064 WIRE 2064 2320 1952 2320 WIRE 2128 2320 2064 2320 WIRE 1744 2400 1744 2320 WIRE 2128 2464 2128 2320 WIRE 1600 2512 1600 2064 WIRE 1744 2512 1744 2480 WIRE 1744 2512 1600 2512 WIRE 1744 2544 1744 2512 WIRE 880 2688 880 2656 WIRE 1056 2688 1056 2160 WIRE 1056 2688 880 2688 WIRE 1344 2688 1344 2224 WIRE 1344 2688 1056 2688 WIRE 1744 2688 1744 2624 WIRE 1744 2688 1344 2688 WIRE 2128 2688 2128 2544 WIRE 2128 2688 1744 2688 WIRE 2272 2688 2272 2528 WIRE 2272 2688 2128 2688 WIRE 880 2704 880 2688 WIRE 1056 2720 1056 2688 FLAG 1056 2720 0 FLAG 1056 1904 V0+ FLAG 1056 2160 V0- FLAG 880 2576 V1+ FLAG 1712 2016 V1+ FLAG 880 2704 V1- FLAG 1712 2080 V1- SYMBOL nmos 2016 1968 R0 SYMATTR InstName M3 SYMATTR Value Si7218DN SYMBOL voltage 1056 1984 R0 WINDOW 123 0 0 Left 2 WINDOW 39 -21 86 VRight 2 WINDOW 3 -53 -147 VRight 2 WINDOW 0 -21 -16 VRight 2 SYMATTR Value PULSE(-20 20 0 50u 50u 200u 500u) SYMATTR InstName V3 SYMBOL zener 1968 2256 R180 WINDOW 0 24 64 Left 2 WINDOW 3 -27 -34 VRight 2 SYMATTR InstName D4 SYMATTR Value BZX84C15L SYMBOL res 1728 2384 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res 1728 2528 R0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL res 1328 2128 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res 1776 2064 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL res 1824 2160 R0 SYMATTR InstName R5 SYMATTR Value 100k SYMBOL res 1360 2000 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL voltage 880 2560 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 15V SYMBOL Opamps\\LT1001 1712 1984 R0 SYMATTR InstName U1 SYMBOL res 2112 2448 R0 SYMATTR InstName R7 SYMATTR Value 200 SYMBOL cap 2256 2464 R0 SYMATTR InstName C1 SYMATTR Value 2200µ TEXT 688 2312 Left 2 !.tran 0 2m 0 1u