Version 4
SHEET 1 928 680
WIRE 32 32 0 32
WIRE 208 64 192 64
WIRE 32 96 16 96
WIRE 96 176 32 176
WIRE 208 176 208 64
WIRE 208 176 176 176
WIRE 16 208 16 96
WIRE 64 208 16 208
WIRE 208 240 208 176
WIRE 208 240 192 240
WIRE 224 240 208 240
WIRE 304 240 288 240
WIRE 368 240 304 240
WIRE 0 256 0 32
WIRE 32 256 32 176
WIRE 32 256 0 256
WIRE 304 256 304 240
WIRE -96 272 -128 272
WIRE 64 272 -32 272
WIRE 32 288 32 256
WIRE -128 336 -128 272
WIRE 32 448 32 432
FLAG 32 448 0
FLAG 112 128 0
FLAG 304 336 0
FLAG -128 416 0
FLAG 368 240 out
SYMBOL R_GF_3-Tr-Opamp_HB 112 240 R0
SYMATTR InstName X1
SYMBOL res 192 160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 48 384 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 510R
SYMBOL Misc\\EuropeanPolcap 16 368 R0
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL Misc\\EuropeanPolcap -32 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 2µ2
SYMBOL cap 288 224 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 10µ
SYMBOL voltage -128 320 R0
WINDOW 3 -96 -102 Left 2
WINDOW 123 -55 11 Left 2
WINDOW 39 0 0 Left 0
SYMATTR Value SINE(0 300mV {gfreq})
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMBOL res 288 240 R0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL GF-bass 112 64 R0
WINDOW 39 -20 17 Left 0
SYMATTR SpiceLine wpf=.4 wpbc=.5
SYMATTR InstName X2
TEXT 264 64 Left 2 !.ac oct 100 20Hz 20kHz
TEXT 96 368 Left 2 !.meas vmax MAX mag(v(out))
TEXT 104 392 Left 2 !.meas c_freq TRIG mag(v(out))=vmax CROSS=1 TARG mag(v(out))=vmax CROSS=1
TEXT 112 424 Left 2 ;.meas fmax FIND freq WHEN v(out)=vmax
TEXT 280 136 Left 2 !.options meascplxfmt=polar
TEXT 296 176 Left 2 ;.tran 0 30m 0 20u
TEXT 576 136 Left 2 !.param gfreq=1kHz
TEXT 584 168 Left 2 !.four {gfreq} v(out)