Version 4
SHEET 1 896 680
WIRE -224 0 -224 -16
WIRE -448 48 -448 32
WIRE -320 48 -320 32
WIRE -224 96 -224 80
WIRE -64 96 -224 96
WIRE 64 96 0 96
WIRE 160 96 144 96
WIRE 176 96 160 96
WIRE 288 96 256 96
WIRE -224 112 -224 96
WIRE -448 144 -448 128
WIRE -320 144 -320 128
WIRE -224 192 -224 176
WIRE 224 208 224 192
WIRE 160 224 160 96
WIRE 192 224 160 224
WIRE 288 240 288 96
WIRE 288 240 256 240
WIRE 336 240 288 240
WIRE 192 256 160 256
WIRE 224 288 224 272
FLAG -320 144 0
FLAG 224 192 +V
FLAG -320 32 +V
FLAG 224 288 -V
FLAG -448 144 0
FLAG -448 32 -V
FLAG 160 256 0
FLAG -224 192 0
FLAG -224 -16 +V
FLAG 336 240 OUT
SYMBOL voltage -320 32 R0
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL voltage -448 32 R0
SYMATTR InstName V2
SYMATTR Value -1.5
SYMBOL res 272 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res 160 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL opamps\\LT1677 224 176 R0
SYMATTR InstName U1
SYMBOL cap -240 112 R0
SYMATTR InstName C1
SYMATTR Value Q=100p*sin(2*pi*2K*time)
SYMBOL res -240 96 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R3
SYMATTR Value 10K
SYMBOL cap 0 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value .68µ
TEXT 392 280 Left 2 !.tran 3m
TEXT 8 -56 Bottom 2 ;3V Electret Microphone Amplifier