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Consumer Electronics by S. P. Bali

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ACTIVE TONE CONTROL

Figure 18.5 illustrates an active tone control circuit which employs a frequency-dependent feedback network between the collector and base of the transistor. For input voltages less than 250 mV the total distortion remains below 0.1%, rising to 0.85% for an output voltage of 2 V at 12,500 Hz. The input and output impedances at 1 kHz are 40 kΩ and 180 Ω respectively.

 

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Fig. 18.5 Active tone control circuit

 

The range of control extends from –22 to +19 dB at 30 Hz, and from –19 to +19.5 dB at 20 kHz. The flat frequency response is obtained when the variable resistors are in the physically central position. The voltage gain ...

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