motorcycle low voltage warning

Posted on Feb 6, 2014

This circuit is connected to your motorcycle. It`s tapped into a circuit thats only powered with the key `ON`. If you turn the bike off with the kill-switch and leave the key on, as you know, the headlight will stay on and quickly drain the battery. With this circuit, once system voltage is down a volt and a half or so, the first comparator turns

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on Q1. Q1 begins charging capacitor C1. After about 6-8 seconds, the voltage on C1 equals the reference zener voltage and the second comparator turns on the beeper. This way the low voltage condition must be sustained, i. e. won`t start chirping while cranking the starter, but still goes off soon enough to keep you from getting too far from your bike. Thanks R. P!

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