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

motorcycle low voltage warning
Click here to download the full size of the above Circuit.

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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