Lucky wrote:
I heard switching supplies are not the best choice for radios. But I don't
know enough about them to really know. So you're putting fuses on the hot
wire {+}coming off the PSU to the radio??

I put a fuse on the hot wire, with amps based on the carrying capacity of the wire
(not the capacity of the power supply!).

The wire goes upstairs from the basement, and at the upstairs end I run it into
many fuse blocks, each with tiny fuses (1/4 to 2a) for each of the devices I
power with it, depending on its needs. The wires that typically run into coaxial
power plugs have very little capacity before overheating, and you want its fuse
to blow before it (the particular wire) heats up.

So no short anywhere heats up any wire.

A normally functioning power supply is quite capable of burning down the house
if run into typical hookup wire without some fusing.

It's unintuitive because the same wire works fine at 120v, but it's amps that
causes heating, not power, and there's ten times more amps (=100 times more heating)
at 12v than 120v.

--
Ron Hardin


On the internet, nobody knows you're a jerk.