20_dB_AUDIO_ROOSTER

Published:2009/7/5 23:32:00 Author:May | From:SeekIC

The amphrer's gain is nominally 20 dB.It 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. The low end's rotloff is primarily a function of capacitor C1, since R1's resistive value is fixed.If C1's value is changed to 0.1μF,the low end's corner frequency-the frequency at which the low end rolloff starts-is reduced to about 70 Hz. If you need an even deeper low end rolloff, change C1 to a 1.0-μF capacitor. If it's an electrolytic type, make certain that it's installed into the circuit with the correct polarity-with the positive terminal con-nected to Q1's base terminal.



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