Emergency 12 volt charger

382

04:49:47

If you are stuck with a dead battery and there is a outlet near by, you could carry match box with a diode bridge and a few resistors too slow the charge.
Most cars have a voltage meter on the dashboard to monitor the charge with. You can build this inside a plug outlet, with such low power supplies to the battery it will take some time to get a charge enough to start the car. This is only a emergency supply of D.C. not advised to use make or sell, just a example of how to get there from here. Remember that working with line voltage is dangerous. Test everything twice before applying any current to a circuit.

published 10 years ago

wyoelk

10 years ago

This could be real dangerous with no safety fuse or relay to open or a zener diode to control voltage if the battery is shorted. Not many 1khz 207 v mains out there. Sorry if sounds harsh but safety first

bilben08

10 years ago

A car battery takes 14v to charge and i wouldnt try it off a 207v 1khz supply if such exists maybe a 120v 60hz and ide change your layout like @wyoelk said this looks pretty dangerous with no regulation or fuse to it

yra

10 years ago

120 Volt's RMS normal u.s. outlet power, RMS = .707 of peak too peak. 120v * 1.707 RMS= 204.84 volts P2P or working voltage of 120.

wyoelk

10 years ago

Still no safety. Ever seen a car battery explode. Especially one with no vent caps removed. Call it a car-b-que in fire depts. Just a zener is better than nothing

yra

10 years ago

Joyous to get help from a clumsom. Show me you can do better.

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