[sdiy] Substitute for pin matrixes?

[David G. Dixon]

Here's a brainfart idea for a DEAD CHEAP matrix:

You know those double-row pin headers?  You know how they sometimes
short-circuit two adjacent pins with a little thingy?

There's your pin matrix.  Each row is a double pin connector of equal
length.  One of the two pin rows is connected together.  Each upper pin is
hardwired to the corresponding lower pin on the row above.  Row-column
connections are made simply by putting one of those short-circuiting doodads
on the row of interest at the column of interest.

Done.


> > Similar to what paul perry suggested£ The ting are, it has to
> > be repeatable (again), not just a on off as i mentioned earlier£
> 
> I think for typical synth signals, that is V rather than mV regime it
> would actually be pretty good.  Other than the odd looks I don't see
> much of a problem.
> 
> > IC holders wont last long enough as pointed out by some one
> > earlier, 100 times aint much£ You claim working for several
> > years?
> 
> I don't think they would fail hard just after 100 cycles, but that's
> something you can even try out.  Do you really care in this
> application if the contact resistance is 300mOhm vs. 25mOhm when new?
> Is it much of a problem that you occasionally may have to pull a pin
> and re-seat it?  Yes, I think I'd get several years of lifetime out of
> it, YMMV.  You could stack two sockets if you think this is going to
> be a big problem, that way the top socket can be exchanged when it
> wears out.  Likewise the resistors could be soldered onto pin strips
> so they are a bit easier on the socket, however they'd also get a bit
> bulkier.
> 
> 
> Achim.
> --
> +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+
> 
> SD adaptations for KORG EX-800 and Poly-800MkII V0.9:
> http://Synth.Stromeko.net/Downloads.html#KorgSDada
> 
> 
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