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 20-DB AUDIO BOOSTER |
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| Circuit Description : |
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| 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 R1.
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. |
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Schematic of 20-DB Audio Booster
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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 0.1 mF, the low end's corner frequency-the frequency at which the low end rolloff starts--is reduced to about 70 Hz.
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| If you need an even deeper low end rolloff, change C1 to a 1.0-mF 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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