Position: Index > Electrical Circuit >

FM_FOR_INSTRUMENTATION

2014-11-24 18:20  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.


FM_FOR_INSTRUMENTATION
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.