4_MHz_COUNTER

Published:2009/7/5 23:59:00 Author:May | From:SeekIC

Portable frequency counter using RCA CMOS logic draws only 300 mW (12 V at 25 mA) yet operates to well above 4 MHz.Supply voltage can be between 4 and 15 V, loosely regulated, without affecting accuracy.Display uses multiplexing with 10% duty cycle to minimize battery drain. One multiplexed output is for three least signmcint figures and other for four most significant figures. Article describes operation in detail. Applications in.dude setting RTTY mark and space tones, FM repeatertones, signal-generator frequencies for TV alignment, tuning musical instruments, and serving as tachometer or speedometer in car.-R. M. Mendelson, Milliwatt Portable Counter, Ham Fladio, Feb. 1977, p 22-25.



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