Stereo headphone frequency response tester circuit

Published:2011/4/29 0:49:00 Author:TaoXi | Keyword: Stereo headphone, frequency response tester | From:SeekIC

The stereo headphone frequency response tester circuit is as shown in the figure, IC1 is the general-purpose four op amp LM324, the Wien bridge sine wave generator is composed of the IC1-1 and IC1-2; amplifier IC1-3, IC1-4 are the voltage follower. The positive feedback circuit of Wien bridge sine wave generator is composed of the C2、R2 and C1, (R1+RP1), the negative feedback circuit is composed of the R3and R5. One of the greatest feature of this circuit is that the general Wien bridge sine wave oscillator (R1+RPl) is usually grounded, but this (R1+RPl) connects to the IC1-2 invert input port's virtual location. The stable-width circuit is composed of the VDl, VD2 and RP2, in the oscillation process, VDl, VD2 alternately turns on, when the amplitude increases, the negative feedback increases too. And it limits the amplitude continues to increase; and vice versa. Adjust the RPI can make the oscillation frequency between 100Hz～125kHz.



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