Version 4 SHEET 1 1360 1528 WIRE -1776 0 -1808 0 WIRE -1184 0 -1776 0 WIRE -224 64 -224 32 WIRE -80 64 -224 64 WIRE -80 80 -80 64 WIRE -1776 128 -1776 0 WIRE -1728 128 -1776 128 WIRE -1616 128 -1664 128 WIRE -1296 128 -1360 128 WIRE -1184 128 -1296 128 WIRE -480 128 -512 128 WIRE -224 128 -224 64 WIRE -224 128 -256 128 WIRE -1296 176 -1296 128 WIRE -80 176 -80 160 WIRE -80 176 -160 176 WIRE -480 192 -688 192 WIRE -160 192 -160 176 WIRE -160 192 -256 192 WIRE -80 192 -80 176 WIRE -160 256 -256 256 WIRE -160 288 -160 256 WIRE -128 288 -160 288 WIRE -80 288 -80 272 WIRE -80 288 -128 288 WIRE -1488 304 -1488 224 WIRE -1296 304 -1296 240 WIRE -80 304 -80 288 WIRE -480 320 -512 320 WIRE -224 320 -256 320 WIRE -224 352 -224 320 WIRE -80 400 -80 368 WIRE -224 448 -224 416 WIRE -688 512 -688 192 WIRE -128 512 -128 288 WIRE -128 512 -688 512 WIRE -128 560 -272 560 WIRE -1488 592 -1488 512 WIRE -272 592 -272 560 WIRE -800 608 -800 576 WIRE -480 640 -480 608 WIRE -320 672 -352 672 WIRE -800 720 -800 688 WIRE -608 720 -608 688 WIRE -272 720 -272 688 WIRE -1488 736 -1488 672 WIRE -688 736 -688 512 WIRE -640 736 -688 736 WIRE -480 752 -480 720 WIRE -480 752 -576 752 WIRE -352 752 -352 672 WIRE -352 752 -480 752 WIRE -640 768 -768 768 WIRE -128 768 -272 768 WIRE -272 800 -272 768 WIRE -608 816 -608 784 WIRE -800 848 -800 816 WIRE -352 880 -352 752 WIRE -320 880 -352 880 WIRE -272 928 -272 896 WIRE -800 960 -800 928 FLAG -1488 736 0 FLAG -1488 512 V_IN_+ FLAG -1808 0 V_IN_+ FLAG -1488 304 0 FLAG -1184 0 V_OUT_+ FLAG -1184 128 VDD FLAG -1296 304 0 FLAG -800 960 0 FLAG -608 816 0 FLAG -80 400 0 FLAG -224 448 0 FLAG -272 720 0 FLAG -272 928 0 FLAG -128 560 V_OUT_- FLAG -128 768 V_OUT_- FLAG -800 576 VDD FLAG -608 688 VDD FLAG -480 608 VDD FLAG -512 128 0 FLAG -512 320 VDD FLAG -224 32 VDD SYMBOL voltage -1488 576 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 24 SYMBOL Vreg\\7805 -1488 128 R0 SYMATTR InstName U1 SYMBOL diode -1728 144 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMBOL Misc\\EuropeanPolcap -1312 176 R0 SYMATTR InstName C1 SYMATTR Value 100µF SYMBOL Misc\\EuropeanCap -240 352 R0 SYMATTR InstName C2 SYMATTR Value 100nF SYMBOL EXTRA\\ExtraOpamps\\LM358_NS -608 752 R0 SYMATTR InstName U2 SYMBOL EXTRA\\Misc\\pot -800 768 R180 SYMATTR InstName ADJ1 SYMBOL Misc\\EuropeanResistor -816 592 R0 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL Misc\\EuropeanResistor -816 832 R0 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL Misc\\EuropeanResistor -96 64 R0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL Misc\\EuropeanResistor -96 176 R0 SYMATTR InstName R5 SYMATTR Value 10k SYMBOL Misc\\EuropeanCap -96 304 R0 SYMATTR InstName C3 SYMATTR Value 100nF SYMBOL nmos -320 592 R0 SYMATTR InstName Q1 SYMBOL nmos -320 800 R0 SYMATTR InstName Q2 SYMBOL Misc\\EuropeanResistor -496 624 R0 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL Robertugo\\555_all -320 240 R0 SYMATTR InstName U4 TEXT -1520 824 Left 2 !.tran 10ms TEXT -8 224 Left 2 ;f ~ 0.6 kHz