I've been playing around with a PCB design that uses a mosfet for reverse polarity protection.? Diodes burn a decent amount of power, this mosfet is significantly less.? It also has over volt protection, and esd/transient protection, and fused.?
I need to stare at the inside of the box to see if there's a way to work it into the box, but I think that's going to be a bit more involved than just making it a dongle/pig tail design.
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PS another diode the other way round feeding a small buzzer
gives an audible alarm if the power is upside down :-) !!!!!
On Sun, Sep 15, 2024 at 02:58 PM, Gareth Evans wrote:
> Another approach which I have not seen proposed is to
> switch the power to the radio with a relay with
> contacts of suitable current handling.
>
> The relay coil is fed by a diode so only comes in
> when the power is of the correct polarity.
>
> The advantage coming through the relay contacts
> is that there is no voltage drop save for the
> miniscule resistance of the relay contacts.
>
>
> On Sat, Sep 14, 2024 at 09:34 PM, Dean Souleles wrote:
> > Reverse diode and a fuse is all I use on any of my projects. Total cost
> about
> > $0.50. Voltage drop equal zero.
> >
>
