[sdiy] DIY patch matrix idea

[Oren Leavitt]

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