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Makers and Making: 12v battery protector circuit.
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djbeauchamp
Nov 16th 2012 edited
I'm working on building a portable battery pack system that supplies 12 volts DC and would like to protect the battery with a voltage cutoff circuit.

I know there are some products out on the market that will do the job, but I'm really wanting to build it from parts to tune te cutoff point tolerances better.

What I have found via googling is this circuit on the MIT website. http://web.mit.edu/3.082/www/team5/pics/voltagecutoff.jpg

But, It's been approximatly 15 years since I used depot level electronics maintenance skills and I'm ashamed to say I can't remember enough to modify the circuit to handle both my base voltage and configure the cutoff point to 11.8 volts.

Thanks in advance for any assistance or advice!
alankilian
Nov 16th 2012
THe explanation of the circuit Here says that the battery gets cutoff when its voltage is less than the zener diode voltage.

So, replace the 1N4733A zener diode with a 1N4742A and the circuit will cut off at 12 Volts.

If you need it to cutoff at exactly 11.8 Volts, you can find an 11.8 Volt Zener
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