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Sounds strange, but I was thinking of using a Lemax or similar accy, that is originally 3v battery powered(like a light/street sign) and convert it for use on a variable voltage post. There must be some kind of resistor to fend off the higher voltage. Is this possible? If I just connect it to the variable voltage post it would be too much(?) and blow it out. Or would You recommend an LED type, if I can fit the LED into the lamp(but I don't think it would fit). This 3v item would also be used, in series, with other 12-14v lamps. thanks

Last edited by Super'O' man
Original Post

If you are hooking up a battery powered accessory like a light bulb, then a transformer can be used. A DC motor driven accessory would burn out on AC transformer power, unless a full wave bridge rectifier is installed across the power input of the accessory, and the power output of the transformer. Getting a transformer down to 3 volts would be difficult, but can be done with voltage regulating circuits or resistors. A simpler solution would be to get a wall-wart type of converter that outputs the DC voltage you need.

Hooking lamps in series makes it more difficult to find a bad bulb, think series Christmas tree light strings.

 

Larry

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