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Flashing battery monitor

2016-05-11 04:27  
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Flashing battery monitor
Here is asimple battery monitor circuitin which theLEDwillcontinueflashinguntil battery voltageis above thelevel. TransistorsQ1andQ2arewiredasan astable multivibratorcircuit. Thisflashingbatterymonitorcircuitcan operatefroma variety ofvoltagesfrom6Vto12V. Thevoltagelevelat whichanLEDstopsflashingcan be setby adjustingR4. When thea presetbatteryvoltagereachesthresholdflashingfrequencydecreasesandwhenthe voltagedrops belowthe threshold ofthe diodeD1LEDturnsOFF. This is usedtocompensate for changesinvoltage ofthe baseemitterQ1due the changes intemperature.