Where to fuse wall wart supply?

Thread Starter

spinnaker

Joined Oct 29, 2009
7,830
I built a wall wart power supply using the LM317 regulator.

Actually it is not really a traditional wall wart but a old laptop supply.


Normally PSUs are fused at the mains. I really don't have access to the main so where should I fuse it? At the input to my supply or at it''s output?
 

t06afre

Joined May 11, 2009
5,934
The laptop power supply should be fused/have protection on both the main side and the low voltage output. And also be protected from say overheating. I would have placed fuses before all in pins on the voltage regulators. From the top of my head. I think the maximum current for your regulators are about 1.5 ampere. Remember that overheating may also be a problem regarding linear voltage regulators
 
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