SCALER_FOR_CB

Published:2009/7/6 2:35:00 Author:May | From:SeekIC

Low-cost prescaler for low-range frequency counter permits accurate monitoring of 450-MHz CB transceiver. Fairchild 11C90 decade counter gives division by 10 for counters covering up to 45 MHz. For lower-range counter, add 74196 TTL decade counter as shown to give total division by 100 for conversion to 4.5-MHz output. D1 and D2 should be fast-switching diodes such as 1N914 or 1N4148.Keep input signal under 1 V to avoid damaging 11C90. Will operate from 5-V supply or four D cells.-P. A. Stark, 500 MHz Scaler, 73 Magazine, Oct. 1976, p 62-63.



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