Signal to both tip and ring, via some series resistors so that if shorted
it doesn't upset the amp, and the sleeve to ground.
---
VK3XJM
0416039082
[email protected]
http://www.zindello.com.au/
On Sun, May 17, 2015 at 7:19 PM, David Rowe <[email protected]> wrote:
> Nice catch Michael and thanks for your feedback! Yes I tested with
> stereo 3.5mm connector. Any suggestions on how we should wire the
> socket to suit both stereo and mono connectors?
>
> I guess if we connect stereo powered speakers we would like both
> channels to be driven.
>
> Thanks,
>
> David
>
>
> On 17/05/15 16:43, Michael Carey wrote:
> > Hi Everybody,
> >
> > I am back from my short vacation/trip to Adelaide South Australia where
> > my SM1000 was hand delivered by David VK5DGR! It was good to finally
> > meet David after many email exchanges and telephone calls.
> >
> > Today I was playing around in the shack with the SM1000 and thought I
> > would hook up an external speaker to improve the received audio
> > "quality". However, when I plugged a handy test speaker into the
> > SM1000... the audio stopped.
> >
> > A quick look at the Rev:D schematic revealed what was happening. The
> > external speaker socket is a TRS (tip ring sleeve) socket with both tip
> > and ring connected to the internal audio amplifier. Most of my external
> > speakers are equipped with a mono (tip sleeve) 3.5mm socket... when you
> > plug one of these into the SM1000 it will short out the audio output.
> >
> > I quickly fitted a three pole 3.5mm plug and all was well. For those
> > with extension speakers lying around in the shack, you can't connect a
> > mono one into the SM1000... be careful! :-)
> >
> > 73
> >
> > Michael.
> > VK5ZEA
> >
> >
> >
> >
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