LED_BATTERY_MONITOR_FOR_12_V_STSTEMS

Published:2009/7/14 1:18:00 Author:May | From:SeekIC

This monitor is handy in cars and is particularly suitable for radio amateurs who power their equipment from a car battery. Bridge rectifier D9-D12 ensures that the battery cannot be connected with incorrect polarity. The zener voltage of diodes D5-D8 increases in standard steps, so the battery voltage needs to be higher to cause successive LEDs to light. In other words, the higher the battery voltage, the more LEDs will light. The component values are chosen so that at a battery voltage of 9 V-battery poor-only D1 lights; when it is about 11 V-battery doubtful-D1 and D2 light; when it is 13 V-battery fine-D1, D2, and D3 light. Diode D4 is a flashing LED. The value of zener diode D8 is such that the LED begins to flash when the battery voltage approaches 15 V-that is, an overvoltage situation.



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