Version 4 SHEET 1 936 680 WIRE -160 -16 -272 -16 WIRE -64 -16 -160 -16 WIRE 720 -16 -64 -16 WIRE 608 16 256 16 WIRE 720 16 720 -16 WIRE 720 16 688 16 WIRE -64 32 -64 -16 WIRE -272 48 -272 -16 WIRE -160 64 -160 -16 WIRE 256 112 256 96 WIRE 256 112 160 112 WIRE 608 112 608 16 WIRE 608 112 464 112 WIRE 720 128 720 16 WIRE 608 144 608 112 WIRE -64 176 -64 112 WIRE -64 176 -128 176 WIRE 16 176 -64 176 WIRE -272 192 -272 128 WIRE -160 192 -160 128 WIRE -160 192 -272 192 WIRE 336 192 256 192 WIRE -272 224 -272 192 WIRE -64 224 -64 176 WIRE 256 224 256 192 WIRE 464 224 464 192 WIRE 528 224 464 224 WIRE -128 272 -128 176 WIRE -128 272 -208 272 WIRE 16 272 16 256 WIRE 16 272 0 272 WIRE 96 272 16 272 WIRE 160 272 160 112 WIRE 336 272 320 272 WIRE 400 272 336 272 WIRE 464 272 464 224 WIRE -272 352 -272 320 WIRE -64 352 -64 320 WIRE -64 352 -272 352 WIRE 16 352 16 336 WIRE 16 352 -64 352 WIRE 128 352 16 352 WIRE 256 352 256 320 WIRE 256 352 128 352 WIRE 528 352 528 304 WIRE 528 352 256 352 WIRE 608 352 608 208 WIRE 608 352 528 352 WIRE 720 352 720 208 WIRE 720 352 608 352 WIRE 128 384 128 352 FLAG 128 384 0 SYMBOL Misc\\battery 720 112 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 1.5 SYMBOL npn 320 224 M0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL npn 0 224 M0 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL res -80 16 R0 SYMATTR InstName R6 SYMATTR Value 4.7k SYMBOL npn -208 224 M0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL res 0 160 R0 SYMATTR InstName R7 SYMATTR Value 200k SYMBOL cap 0 272 R0 SYMATTR InstName C4 SYMATTR Value 5n SYMBOL res 240 0 R0 SYMATTR InstName VR1 SYMATTR Value 5k SYMBOL res 240 96 R0 SYMATTR InstName VR2 SYMATTR Value 5k SYMBOL res 704 0 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 220 SYMBOL cap 592 144 R0 SYMATTR InstName BigC SYMATTR Value 10µ SYMBOL res 320 176 R0 SYMATTR InstName R8 SYMATTR Value 200k SYMBOL cap 464 256 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value .1µ SYMBOL res 448 96 R0 SYMATTR InstName R1 SYMATTR Value 3.3k SYMBOL cap 160 256 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value .1µ SYMBOL voltage 528 208 R0 WINDOW 123 24 132 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value2 AC .1u SYMATTR InstName Microphone SYMATTR Value SFFM(0 1u 2000 100 100) SYMBOL res -288 32 R0 SYMATTR InstName Earphone SYMATTR Value 75 SYMBOL cap -176 64 R0 SYMATTR InstName C3 SYMATTR Value .1µ TEXT -360 504 Left 0 !.tran 0 100ms 0 1ms