powering clock from 12 volt battery?
I have a little clock that's powered with a AA battery , How would I go about wiring it so that it is powered from a 12 volt car battery? Thanks
Forum Discussion
Yes, if you happen to have one laying around, then using a variable resistor as a voltage dropping resistor to establish a +1.5 Vdc clock voltage will work quite well.
Just a word of caution, though. Be absolutely certain that you have the variable resistance set towards the top of the range before you connect it. If the resistor is near-zero resistance when you hook it up, you will surely fry the clock innards because you will be applying the full 12 volts to the circuit.
Furthermore, unless you have an ongoing need for that variable resistor elsewhere, you could actually leave it in place after you have set the voltage.
Dale
Just a word of caution, though. Be absolutely certain that you have the variable resistance set towards the top of the range before you connect it. If the resistor is near-zero resistance when you hook it up, you will surely fry the clock innards because you will be applying the full 12 volts to the circuit.
Furthermore, unless you have an ongoing need for that variable resistor elsewhere, you could actually leave it in place after you have set the voltage.
Dale
