No desire to step on toes.. I didn't read all the posts on this. Having an extensive background in electronics, there ARE Digital bar graph integrated circuits, which will drive a bar graph LED. They consume about 20 ma (almost non existent power wise), and the needed voltage to operate is only 5 volts. They can also be operated with a separate battery.. but why? If your A/C battery is down to 5.. then it really doesn't matter. They could also be made to illuminate an additional "front and center", brighter warning light.. or horn. The bar graph LED can be as small as 3/8" x 3/4".. so very little panel space is needed. And just as easily can be made to endure significant spikes or over-voltage conditions.
Jerry
--- In Sport_Aircraft@yahoogroups.com, "Bill" <wrhobson@...> wrote:
>
> What with our ever-increasing reliance on airborne electronic gear I'd like to install a simple (cheap) alternator warning light in my plane. Something that would maybe blink and/or produce an audible alarm when the battery discharged below a pre-set level would be ideal. Has anybody run across such an item? Thanks.
>
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