Re: #QCX+ D3 MOD - D3 replacement for LOW voltage drop

Arv Evans <arvid.evans@...>

That has already been suggested on this and on several related forums.
It is a good idea, but some seem to feel that using a relay is old-school.


On Mon, Jun 14, 2021 at 2:38 PM Jim Campbell <jecspasc@...> wrote:
Some 60 years ago I was a young engineer and ham. Semiconductors were in
a very basic form, diodes and NPN and PNP transistors. Our solutions
back then tended to be very simple.

This afternoon I gave some thought to to the problem of voltage drop due
to an inline diode. Why can't we get a small SPST relay and put a diode
in series with the coil. Then wire the +12 volts through the SPST
contacts. If the polarity of the input was correct the relay would pick
and the full 12 volts would be applied to the radio. What am I missing?


Jim Campbell
W4BQP since 1953

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