1_mA_S_METER

Published:2009/6/30 21:27:00 Author:May | From:SeekIC

Amplifier designed for 1-mA meter movement consists of two-stage voltage amplifier driving meter rectifier. FET input provides high impedance to detected audio and minimizes loading and distortion problems. Q2 is common-emitter voltage amplifier with simple positive-pulse rectifier for meter. GI filters rectified audio signal. AF input for S-9 reading is 25-30 mV P-P and for full scale is 50-60 mV P-P Frequency response is 500 Hz to 10 kHz.-M A. Chapman, Solid-State S-Meters, Ham Fladio, March 1975, p 20-23.



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