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<p>Call me a high tech heretic, but I lean toward using a cross
point switch IC like the ADG2188, and having a matrix of
pushbuttons/LEDs for control. That way you can save and restore
configurations.</p>
<p>-TimR<br>
</p>
<br>
<div class="moz-cite-prefix">On 5/20/2016 8:09 PM, Oren Leavitt
wrote:<br>
</div>
<blockquote cite="mid:573FD14C.3080009@ix.netcom.com" type="cite">With
sources of ready-made patch matrix solutions being scarce, I have
been mulling over ideas for a DIY patch matrix.
<br>
<br>
I am thinking of using 2.5mm or 3.5mm stereo TRS mini phone jacks
arranged in a matrix. These can purchased in bulk for reasonable
prices. The tips would be wired as "columns" connecting to a
source. The rings wired as "rows" connecting to a summing node
input.
<br>
<br>
The plugs would house a standard 100K resistor wired from the tip
(source) to the ring (summing node input). Additional "special"
plugs can be fitted with smaller or larger resistors for added
gain or attenuation, or an AC coupling capacitor.
<br>
<br>
These jacks could even be used as "inserts" for an external signal
processor between source and input.
<br>
<br>
- Oren
<br>
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<br>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
--Tim Ressel
Circuit Abbey
<a class="moz-txt-link-abbreviated" href="mailto:timr@circuitabbey.com">timr@circuitabbey.com</a></pre>
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