[sdiy] dumb question about transformers

[Seb Francis]

Put a 1A fuse on the transformer output.  Use a heatsink for your 
regulators if you are to deliver 600mA.  The regulators are internally 
protected against thermal overload/shortcircuit, so you probably won't 
ever blow the 1A fuse by overloading your PSU - it's more a safety 
feature in case something in the PSU circuit itself goes wrong / is 
wired wrong - then you won't melt the transformer.

Seb


Danjel van Tijn wrote:

> So I am build a PSU that can't really deliver more than 600mA (uses 
> LM7912's and LM7812 regulators).
>  
> I have a 24 VCT transformer hooked up to it that is rated at 1A. 
> Should I be putting a 1A fuse at the XFRM input or should I put a 
> smaller value?
> Just worried about safety...
>  
> thanks,
>       Danjel
>  
>