5 mA S METER


Posted on Feb 6, 2014

Circuit designed for 5-mA meter movement uses two-stage voltage ampilfer Q1-Q2 with emitter-follower output Q3 serving as impedance-matching stage AF input for S-9 reading is 25-30mV P-P and forfull scale is 50-60mV P-P Frequency response is 500 Hz to 10 kHz-M A Chapma, Solid-State S-Me-ters, Ham Radio March 1975 p 20-23


5 mA S METER
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