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The need to step down a dc voltage to power a clock

dimitri123

I have 5.7volts dc from my power supply. I need to get that voltage down to 1.5volts dc to power a clock. The output should be regulated to ensure the clock will work correctly. How can I do this? Voltage divider? Zener diode?

thanks,

Dimitri

  • 0

    I would use a voltage regulator to convert the voltage from 5.7 volts to 1.5V.  To find the correct part you would need to know how much current your clock draws.  If the current level is low (a couple of mA or so), a simple linear regulator should work fine.  If the current is higher, then a something more like a switching regulator might be needed to avoid heat buildup in the regulator.

    If you are looking for a assembly that you can buy, try searching for "battery eliminator", which might yield some results.

    If you want to build a circuit, there are lots of examples on the web (or even here).  Look for voltage regulator 1.5V.

    Good luck!

  • 0

    You could use an LM317.

    You could use a Ni-Cd battery and add a trickle charger powered off your 5.7V supply (a diode and ballast resistor selected for a few mA off trickle current). Bonus, the clock still runs with the power disconnected.

  • 0

    How much current do you need for the clock ?

    Is it normally powered by a battery ?

    How about a picture if you don't know the actual current ?

    Do you care how much current is drawn from your power supply ?

    MK