[sdiy] DIY patch matrix idea

Tim Ressel timr at circuitabbey.com
Sat May 21 09:20:32 CEST 2016

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.


On 5/20/2016 8:09 PM, Oren Leavitt wrote:
> With sources of ready-made patch matrix solutions being scarce, I have 
> been mulling over ideas for a DIY patch matrix.
> 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.
> 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.
> These jacks could even be used as "inserts" for an external signal 
> processor between source and input.
> - Oren
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--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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