Version 4 SHEET 1 2492 744 WIRE 208 -208 -48 -208 WIRE 336 -208 208 -208 WIRE 464 -208 336 -208 WIRE 208 -192 208 -208 WIRE 464 -176 464 -208 WIRE -48 -160 -48 -208 WIRE 336 -144 336 -208 WIRE 208 -96 208 -112 WIRE 272 -96 208 -96 WIRE 208 -80 208 -96 WIRE 464 -64 464 -96 WIRE -48 -16 -48 -80 WIRE -48 -16 -240 -16 WIRE 32 -16 -48 -16 WIRE 112 -16 96 -16 WIRE 160 -16 112 -16 WIRE -240 16 -240 -16 WIRE -48 16 -48 -16 WIRE 112 16 112 -16 WIRE 208 32 208 16 WIRE 240 32 208 32 WIRE 336 32 336 -48 WIRE 336 32 304 32 WIRE 400 32 336 32 WIRE 512 32 464 32 WIRE 576 32 512 32 WIRE 336 48 336 32 WIRE 512 48 512 32 WIRE -240 112 -240 96 WIRE -48 112 -48 80 WIRE 112 112 112 96 WIRE 208 144 208 32 WIRE 336 144 336 128 WIRE 336 144 208 144 WIRE 512 144 512 128 WIRE 336 160 336 144 WIRE 208 176 208 144 WIRE 336 256 336 240 WIRE 208 272 208 256 WIRE 336 336 336 320 FLAG 464 -64 0 FLAG -240 112 0 FLAG 512 144 0 FLAG 576 32 OUT FLAG 112 112 0 FLAG 208 272 0 FLAG 336 336 0 FLAG -48 112 0 SYMBOL njf 160 -80 R0 WINDOW 0 62 19 Left 0 WINDOW 3 56 52 Left 0 SYMATTR InstName Q1 SYMATTR Value 2N5458 SYMBOL pnp 272 -48 M180 WINDOW 0 57 66 Left 0 WINDOW 3 39 39 Left 0 SYMATTR InstName Q2 SYMATTR Value 2N3906 SYMBOL cap 96 -32 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value .01µ SYMBOL cap 304 16 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value .0033µ SYMBOL cap 400 16 M90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C3 SYMATTR Value 22µ SYMBOL cap 320 256 R0 SYMATTR InstName C4 SYMATTR Value 22µ SYMBOL res -64 -176 R0 SYMATTR InstName R1 SYMATTR Value 10K SYMBOL res 192 -208 R0 SYMATTR InstName R2 SYMATTR Value 5K SYMBOL res 96 0 R0 SYMATTR InstName R3 SYMATTR Value 1Meg SYMBOL res 192 160 R0 SYMATTR InstName R4 SYMATTR Value 1.6K SYMBOL res 320 32 R0 SYMATTR InstName R5 SYMATTR Value 3.9K SYMBOL res 320 144 R0 SYMATTR InstName R6 SYMATTR Value 200 SYMBOL res 496 32 R0 SYMATTR InstName R7 SYMATTR Value 47K SYMBOL current -240 96 M180 WINDOW 0 22 85 Left 0 WINDOW 3 26 6 Left 0 WINDOW 123 4 40 VTop 0 WINDOW 39 0 0 Left 0 SYMATTR InstName I2 SYMATTR Value SINE(0 1u 1K) SYMBOL diode -64 16 R0 SYMATTR InstName D2 SYMATTR Value ElectretMic SYMBOL Misc\\battery 464 -192 R0 SYMATTR InstName V1 SYMATTR Value 9 TEXT 464 312 Left 0 !.tran 10m TEXT 424 200 Left 0 !.four 1K V(out)\n.options plotwinsize=0 TEXT -944 -200 Left 0 ;Specs:\n .05% THD @ 1KHz .4V p-p output\n 1.9mA current draw(~370 Hr 9V Alkaline life)\n 26.4dB gain 3dB BW: 38Hz to 12KHz\n Z-out= 387 Ohm @ 1KHz\n 1.2µV input referred noise from 10Hz to 20KHz(with voltage source input)\n 11 Parts: 4 C's, 2 Q's, 7 R's TEXT -800 128 Left 0 !.model ElectretMic D(Ron=1.15K Ilimit=400u)\n \n.model 2N5458 NJF(Beta=488.9u Betatce=-.5 Rd=1 Rs=1 Lambda=3.167m Vto=-2.882\n+ Vtotc=-2.5m Is=181.3f Isr=1.747p N=1 Nr=2 Xti=3 Alpha=2.543u Vk=152.2\n+ Cgd=4p M=.3114 Pb=.5 Fc=.5 Cgs=4.627p Kf=4.284E-18 Af=1)