Posted on Dec 19, 2012

The amplifier`s gain is nominally 20 dB. Its frequency response is determined primarily by the value of just a few components-primarily C1 and Rl. The values in the schematic diagram provide a response of ±3.0 dB from about 120 to over 20,000 Hz. Actually, the frequency response is flat from about 170 to well over 20,000 Hz. it`s the low end.that deviates from a flat frequency response. The low end`s rolloff is primarily a function of capacitor C1, since R1`s resistive value is fixed. If C1`s value is changed to 0.1uF, the low end`s comer frequency-the frequency at which the low end rolloff starts-is reduced to about 70 Hz.

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Ifyou need an even deeper low end rolloff, change C1 to a 1.0uF capacitor. If it"s an electrolytic type, make certain that it"s installed into the circuit with the correct polarity-with the positive terminal connected to Q1"s base terminal.

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