I have a 120v AC Class 2 Power Supply that is rated 12v 500mA DC output. On the voltmeter, its output is ~20.4 volts. What typically goes bad that causes such a high spike in the output voltage?
Wall Transformer Gone Bad?
Nov 04, 2005
8 Replies
I don't have a 24 ohm load, but I connected a 150 ohm load and the voltage across the leads dropped to 17.3 volts.
Lern 2 spel.
Right.
So the wallwart is fine.
Graham
How does the AC power supply have a DC current rating? You mean it is
120VAC input with 12VDC @ 500mA output. This power supply is unregulated, it's only function is line step-down, rectification, and some filtering. The output DC voltage will be a function of loading, settling to 12VDC with 500mA of current draw. If you need 12VDC at lesser current, you will have to add an external regulator, or buy one that has the word "regulated" on the label."VHarris"
** Connect a 24 ohm ( 6 watt rated ) load.See what happens.
............ Phil
** Learn how to post.
The learn ohm's law.
......... Phil
Or put an extra load resistor in parallel with the load you want to run, that will bring the voltage down.
"John Fields"
** Yawn.** A nice cover story.
........ Phil
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