Fuse for radio

Fuse resistance and voltage drop - Yep, each fuse size has a different resistance and thus a voltage drop. Who knew??

Small values of fuses (and breakers) have a bigger/worse voltage drop. For the widely used Bussman brand fuses here are some examples (at a 1A load)*;

1A 0.190Vdc drop
2A 0.078Vdc drop
3A 0.045Vdc drop
5A 0.024Vdc drop

So bigger is certainly better and 3A and higher is recommended.

Thanks, John

*Reference: http://www.cooperindustries.com/cont...AGC_Series.pdf