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 Low Voltage Alarm Circuit (DC voltage)		  New Topic  Reply to Topic
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Merv
New Member

USA
1 Posts
Posted - Mar 09 2012 :  10:59:09 AM  Show Profile  Reply with Quote
Hi all,

New to this forum. I hope I may be of some help to others when I can.

I need to build a circuit that will sound a buzzer when the voltage in a set of LiPo batteries hooked in series falls below 42vdc.

Anyone have any ideas for a circuit that will handle this high of voltage or know where there may be an existing circuit that can be modified to meet my needs?

I would really appreciate any information you can offer!!

Thanks,

Merv
mervrosenquist@yahoo.com
If it can Fly, I'll fly it! Real or RC

Aaron Cake
Administrator

Canada
6718 Posts
Posted - Mar 10 2012 :  10:17:39 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
The easiest way would be to use a zener diode to conduct to the base of a transistor, with another transistor connected as an inverter. That 2nd transistor triggers your buzzer, which has a dropping resistor in series to lower the supply voltage.
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