NICAD_MONITOR

Published:2009/6/29 22:40:00 Author:May | From:SeekIC

Uses two comparators, flip-flop, and power stage all in single NE555 IC. When battery voltage drops below 12-V threshold set by R1 and R2 for 15-V transceiver battery, one comparator sets flip-flop and makes output at pin 3 go high. IC then supplies up to 200 mA to LED or other indicator. For other battery voltage value, set firing point to about three-fourths of fully charged voltage. Sinqe battery voltage will show biggest drop when transmitting, connect monitor across transmit supply only so as to minimize battery drain.-A. Woemer, Ni-Cad Lifesaver, 73 Magazine, Nov. 1973, p 35-36.



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