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12 Volt Battery Guardian Circuit
Don't get caught with a flat battery; this easy-to-build circuit can cut off the power to a 12V fridge or car stereo system if the battery voltages drops below critical level. Electric fridges in vans and 4WDs are a great idea but if you are not careful, they can severely discharge the battery and leave you stranded. Maybe the battery will end up with severe damage as well. The same problem applies if you have a big stereo system and you like to play it without the motor running.
- Cuts power to load (eg, fridge) when battery voltage drops below a preset level.
- 10A rating.
- Low power drain.
- Chirping sound during cut-out.
- Flashing LED indication during cut-out.
- Automatically reconnects power when battery recharged.
Source: Silicon Chip 6 May 2002