Gallery, Projects and General > How do I??

How to check a 5V phone charger for good DC?

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vtsteam:
Should be pointed out for anyone else reading and attempting this that the resistor has to be rated at least a couple of watts. Not sure I have anything like that, might have to get creative.....

vtsteam:
I found an old 120V 20W appliance bulb salvaged from a microwave oven, and it happened to test out at 57 ohms. Of course resistance changes when powered and heated up, but in this case the voltage is so low that it doesn't light. I checked the current at 5 volts and it was 250 ma. About half of full load.

I had a 2200ufd cap, so I used that, and my meter showed on AC about 11 mV and 4.9 V DC, so I'm thinking it's good to use.

Thanks Andrew.  :beer:

awemawson:
Glad to help

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