12_V_MONITOR

Published:2009/7/14 20:52:00 Author:May | From:SeekIC

Voltage-limit sensor gives visual indication that voltage in auto or boat electric system is satisfactory for operation of critical electronic equipment. Combination of zener diodes D1 and D2 acting with base-emitter voltage drops of Q1 and Q3 makes any voltage less than 13.5 V turn on amber No. 330 pilot lamp (14 V at 80 mA), while voltage above 15.2 V turns on red pilot lamp of same type. Transistors are Motorola MPS 3704. D1is 1N5243B 13V zener, and D2 is 1N5245B 15-V zener.-M. J. Moss, Voltage Limit Sensor, 73Magazine, May 1973, p 53-54.



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