[sdiy] dumb question about transformers

[Seb Francis]

What I should have said is put a 1A fuse on the output of *each* of your 
2 transformer taps (I assume you have a 12-0-12 transfomer, so connect 
the centre tap to GND and the 2 outside taps via 1A fuses to your bridge 
rectifier inputs)


Seb Francis wrote:

> 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
>>  
>>  
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