70_dB_GAIN_WITH_15_V

Published:2009/6/28 23:24:00 Author:May | From:SeekIC

Operates from sihgle penlight qell at current drain of 0.5 mA. ldeal as self-contained unit inserted in microphone cable. Q2-Q4 form 70-dB voltage amplifier. Q5 is detector, and Q6 is emitter-follower driving AGC transistor Q1.3-dB bandwidth is about 100 Hz to 8 kHz. Full output is about 200 mVRMS, while low output terminal is 1 mVRMS.-C.Hall, Low-Voltage Audio AGO Amplifier, Ham Radio, Dec. 1973, p 32-34.



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