The twin-T complementary amplifier circuit with filter selector

The filter circuit of this main circuit will sent to through to the signal that middle frequency. At the same time is attenuated the others frequency into input signal to R1 through the base of emitter circuit as complementary form (T1/T2). And the feedback from the emitter lead of T1 and T2 through twin-T to input of the complementary amplifier (T3/T4) at others frequency from feedback. Then, out to the collector lead of T3 and T4. By there are the phase opposite the input signal. Thus, at a moderate frequency of the twin-T has been reduced significantly.   Therefore, The…

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The twin-T complementary amplifier circuit with filter selector
The twin-T complementary amplifier circuit
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