> > > I am trying to put together an interface for a IC706 to use with TR. I
> > > would like to be able to use one serial port for both the
> frequency read
> > > out and keying. I am trying to use the serial port voltages
> to power the
> > > transistors in the frequency read out part of the interface.
> ------------
> I believe this has been discussed before, and the consensus is always
> use a separate
> power supply for accessories. Ports were never intended for use as
> PSs.
>
If you're running the IC706, then you have 12/13.8V feeding it. Power off
of it back through the PC-radio cable to the transistors/opamps. Why risk
the LPT/Serial ports?
73,
dale, kg5u
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