FM_FOR_INSTRUMENTATION

Published:2009/7/14 8:07:00 Author:May | From:SeekIC

Frequency modulator-demodulator circuit using IC and opamp converts ordinary low-cost tape recorder into instrumentation recorder. Signetics NE565 phase-locked loop serves for both modulation and demodulation. Frequency response of 0-800 Hz is suitable for recording VLF phenomena at tape speed of 9.1 cm/s (3.5 in/s). Carrier frequency is in midband, at 3 kHz. Article covers circuit operation in detail and gives de-sign equations.-B. D, Jordan. Simple F.M.Modulator/Demodulator for a Magnetic Tape Recorder, Wireless World, March 1974, p 29-30.



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