[sdiy] GEM / GeneralMusic SX-3 service manual

[Rutger Vlek]

Hi Brian,

I know, beautiful thing, a switch matrix. This works differently though.
I've been able to identify the pinout of the plug and it carries two types
of grounds, one for shield and one for power. It carries a +5v supply line
and provides an Rx data input pin. So the original pedal for which this
input was designed must carry some active electronics. I haven't yet nailed
how they would gave done timing of the Rx channel. Anyone fancy a guess at
what would have been in there?

Rutger

Op zo 15 jul. 2018 20:34 schreef <rsdio at audiobanshee.com>:

> You only need 11 or 12 pins for a matrix to support a 30-note pedal board.
> How many lines on the DIN plug?
>
> Brian
>
>
> On Jul 14, 2018, at 1:25 AM, Rutger Vlek <rutgervlek at gmail.com> wrote:
> > Additionally, another question for GEM conaisseurs: there's a pedalboard
> input (looks like a DIN-variant plug) that seems intended to be used with
> bass pedals. Anyone know which type of pedals could connect to this? Or
> what the control protocol is? I'm suspecting it's either a straight
> diode-matrix-scan input (but don't think there's enough lines to make up
> the required notes), or communication line to some kind of multiplexer or
> shift-register internal to the pedals. I have pedals from another brand
> here, with straight switch-outputs and I'd love to modify it to work with
> the Gem.
>
>
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