15 volt dc power supply reviews

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Darren asked Calculate how to size a resistor for following circuit?

Have a DC supply that varies from 48-54VDC that is supplying a relay that works between 12-48VDC. We have a 475 ohm resistor in series to drop the voltage but we continually keep blowing up the electronic relay. We are now looking at connecting a zener Diode (39V 1W) and keep the series resistor. Will we need to change the size of the resistor? Could someone show me how to calculate this?

And got the following answer:

Ohm's Law is a powerful tool that will solve this easily. First a comment - for a 475 ohm resistor to reduce 54 volts to 48 volts the relay would have to draw 12 milliamps minimum. Your relay may not have been that great of a load. Now for your proposed solution (which is a good one) the resistor will drop 15 volts max and you want the zener to not exceed 1 watt say 1/2 watt so the zener current will be limited to 33 milliamps.Now for Ohm's law R=E/I or R = 15/.033 R = 450 ohms. You could probably still use the 475 Ohm resistor as long as it can safely handle the power of about 1/2 watt. The 39 volt zener diode will keep the voltage on the relay within spec.


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