Version 4 SHEET 1 948 680 WIRE -128 -16 -256 -16 WIRE 16 -16 -128 -16 WIRE 144 -16 16 -16 WIRE 368 -16 144 -16 WIRE 400 -16 368 -16 WIRE 544 -16 480 -16 WIRE -256 0 -256 -16 WIRE 544 0 544 -16 WIRE -128 16 -128 -16 WIRE 144 48 144 -16 WIRE -256 96 -256 64 WIRE -128 96 -128 80 WIRE 544 112 544 80 WIRE 368 128 368 -16 WIRE -448 176 -496 176 WIRE -400 176 -448 176 WIRE -336 176 -400 176 WIRE -224 176 -272 176 WIRE -128 176 -224 176 WIRE -96 176 -128 176 WIRE -32 176 -96 176 WIRE 32 176 -32 176 WIRE 144 176 144 128 WIRE 144 176 96 176 WIRE 240 176 144 176 WIRE 272 176 240 176 WIRE 304 176 272 176 WIRE 240 192 240 176 WIRE 144 208 144 176 WIRE -496 240 -496 176 WIRE -400 240 -400 176 WIRE -224 240 -224 176 WIRE -128 240 -128 176 WIRE -32 240 -32 176 WIRE 240 272 240 256 WIRE 368 272 368 224 WIRE 368 272 240 272 WIRE 448 272 368 272 WIRE 240 288 240 272 WIRE 368 288 368 272 WIRE -496 384 -496 304 WIRE -400 384 -400 304 WIRE -400 384 -496 384 WIRE -224 384 -224 304 WIRE -224 384 -400 384 WIRE -128 384 -128 304 WIRE -128 384 -224 384 WIRE -32 384 -32 320 WIRE -32 384 -128 384 WIRE 144 384 144 288 WIRE 144 384 -32 384 WIRE 240 384 240 352 WIRE 240 384 144 384 WIRE 368 384 368 368 WIRE 368 384 240 384 WIRE -32 416 -32 384 FLAG -256 96 0 FLAG -128 96 0 FLAG -32 416 0 FLAG 544 112 0 FLAG 448 272 out IOPIN 448 272 Out FLAG 272 176 b FLAG -448 176 1 FLAG -96 176 2 FLAG 16 -16 6v8 FLAG 544 -16 batt SYMBOL Misc\\EuropeanResistor 128 32 R0 SYMATTR InstName R1 SYMATTR Value 22k SYMBOL Misc\\EuropeanResistor 128 192 R0 SYMATTR InstName R2 SYMATTR Value 27k SYMBOL cap 32 192 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C1 SYMATTR Value 390p SYMBOL ind -48 224 R0 SYMATTR InstName L1 SYMATTR Value 10µ SYMBOL cap -144 240 R0 SYMATTR InstName C2 SYMATTR Value 47p SYMBOL cap -240 240 R0 SYMATTR InstName C3 SYMATTR Value {CT1} SYMBOL cap -512 240 R0 SYMATTR InstName C5 SYMATTR Value 22p SYMBOL cap -272 0 R0 SYMATTR InstName C6 SYMATTR Value 10n SYMBOL zener -144 80 M180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D1 SYMATTR Value BZX84C6V8L SYMBOL npn 304 128 R0 SYMATTR InstName Q1 SYMATTR Value BC547B SYMBOL cap 224 192 R0 SYMATTR InstName C7 SYMATTR Value 680p SYMBOL cap 224 288 R0 SYMATTR InstName C8 SYMATTR Value 470p SYMBOL Misc\\EuropeanResistor 352 272 R0 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL cap -416 240 R0 SYMATTR InstName C4 SYMATTR Value {CT2} SYMBOL Misc\\EuropeanResistor 384 0 R270 WINDOW 0 27 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName R4 SYMATTR Value 270 SYMBOL voltage 544 -16 R0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL cap -336 192 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C9 SYMATTR Value 10p TEXT -344 480 Left 0 !.model BZX84C6V8L D(Is=1.5n Rs=.5 Cjo=170p nbv=3 bv=6.2 Ibv=1m) TEXT -528 -104 Left 0 !.param CT1=30p\n.param CT2=30p TEXT -528 -160 Left 0 !.tran 0 100u 0 10n TEXT -528 -136 Left 0 !.options plotwinsize=0 TEXT -144 -160 Left 0 ;Plot Settings -> View --> FFT