[sdiy] DIY patch matrix idea

Jim Patchell patchell at cox.net
Sat May 21 18:35:55 CEST 2016


Struck a nerve with me.  However, so far, I have not been able to locate 
PCB mount Vertical 3.5mm stereo phone jacks.  Is this what you were 
planning to use?  And if so, could you clue me in to who sells them?  
Mouser, Digikey, Tayda and Small Bear all have come up short.


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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