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AUDIO-FREQUENCY METER


LM2111

Covers 0-100 kHz in four ranges. Meter reading is indepen-dent of signal amplitude frorn 1.7 VRMS upward and independent of waveform over wide range.

Linear response means only one point need be calibrated in each frequency range. Circuit uses two overdriven FET amplifier stages in cascade.

Square-wave output of Iast stage is rectified by X1 and X2. Deflection of meter depends only on number of pulses per second passing through meter so is proportional to pulse frequency.

Battery drain is 1.4 mA.-R. P. Tumer, "FET Cir-cuits," Howard W. Sams, Indianapolis, IN, 1977, 2nd Ed., p 129-131.

               
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