Version 4 SHEET 1 880 680 WIRE 592 -64 368 -64 WIRE -768 -48 -768 -64 WIRE 592 -48 592 -64 WIRE 48 -16 -432 -16 WIRE 368 0 368 -64 WIRE 368 0 -64 0 WIRE 432 0 368 0 WIRE -544 16 -672 16 WIRE 384 16 96 16 WIRE -672 32 -672 16 WIRE 368 32 368 0 WIRE 368 32 -32 32 WIRE -272 48 -288 48 WIRE -160 48 -192 48 WIRE 592 48 592 32 WIRE 128 80 32 80 WIRE 368 80 368 32 WIRE 368 80 352 80 WIRE 432 80 432 64 WIRE 32 96 32 80 WIRE -544 112 -544 96 WIRE -384 112 -544 112 WIRE -288 112 -288 48 WIRE -288 112 -304 112 WIRE -544 128 -544 112 WIRE -32 128 -32 32 WIRE -288 144 -288 112 WIRE -256 144 -288 144 WIRE 48 144 48 -16 WIRE 96 144 96 16 WIRE 96 144 48 144 WIRE 128 144 96 144 WIRE 416 144 352 144 WIRE 528 144 416 144 WIRE -160 160 -160 48 WIRE -160 160 -192 160 WIRE 48 160 48 144 WIRE -256 176 -288 176 WIRE 128 208 -32 208 WIRE 384 208 384 16 WIRE 384 208 352 208 WIRE -672 224 -672 112 WIRE -544 224 -544 208 WIRE -544 224 -672 224 WIRE -432 224 -432 -16 WIRE -384 224 -432 224 WIRE -288 224 -288 176 WIRE -288 224 -304 224 WIRE -256 224 -288 224 WIRE 384 224 384 208 WIRE 416 224 384 224 WIRE 48 240 48 224 WIRE 128 272 96 272 WIRE 384 272 352 272 WIRE -64 320 -64 0 WIRE 96 320 96 272 WIRE 96 320 -64 320 WIRE 528 320 528 224 WIRE 528 320 96 320 WIRE 384 336 384 272 WIRE -256 368 -256 304 WIRE 384 416 384 400 FLAG 48 240 0 FLAG 432 80 0 FLAG 32 96 0 FLAG 384 416 0 FLAG 592 48 0 FLAG 48 144 d_scie FLAG -256 368 0 FLAG -224 192 0 FLAG -768 -48 0 FLAG -768 -144 Vcc FLAG -224 128 Vcc FLAG -544 224 0 SYMBOL Misc\\NE555 240 176 R0 SYMATTR InstName U1 SYMBOL res 544 240 R180 WINDOW 0 36 76 Left 2 WINDOW 3 -36 34 Left 2 SYMATTR InstName RA SYMATTR Value 11k SYMBOL cap 32 160 R0 SYMATTR InstName C SYMATTR Value 0.002µ SYMATTR SpiceLine V=50 Irms=0 Rser=0 Lser=0 mfg="Murata" pn="GCM1885C1H202JA16" type="C0G" SYMBOL res 400 128 R0 SYMATTR InstName RB SYMATTR Value 10 SYMBOL res -48 112 R0 WINDOW 0 34 52 Left 2 WINDOW 3 35 84 Left 2 SYMATTR InstName RL SYMATTR Value 1k SYMBOL cap 416 0 R0 SYMATTR InstName C2 SYMATTR Value 0.01µ SYMATTR SpiceLine V=16 Irms=0 Rser=0.0158 Lser=350p mfg="Würth Elektronik" pn="885012008017 WCAP-CSGP 1206" type="NP0" SYMBOL voltage 592 -64 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL cap 368 336 R0 SYMATTR InstName C3 SYMATTR Value 0.001µ SYMATTR SpiceLine V=16 Irms=0 Rser=0.044 Lser=420p mfg="Würth Elektronik" pn="885012006029 WCAP-CSGP 0603" type="NP0" SYMBOL Comparators\\LT1720 -224 96 R0 SYMATTR InstName U2 SYMBOL res -288 96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res -176 32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL res -288 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res -240 320 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL voltage -768 -160 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL res -560 112 R0 SYMATTR InstName R5 SYMATTR Value 212 SYMBOL res -560 0 R0 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL voltage -672 16 R0 SYMATTR InstName V4 SYMATTR Value 12 TEXT -64 360 Left 2 !.tran 20m startup