ARP 3604p

[Tim Curtis]

Thanks Mike!

This is good news.  The keyboard is missing it's top, so I think I might
remove the handle and top-mounting hardware and re-tolex it.

I need to replace a few of the springs that contact the bus-bars.  Anyone know
a source?  (Phil?)

Also, anyone have schemos for this thing?  I figure I might as well go through
it and make sure it's working perfectly...  :-)

Thanks Everyone!


Tim

Mike Granger wrote:

> Tim,
>
> If you supply the 3604 with +/- 15 volts, it will generate keyboard cv,
> trigger pulses on key press (momentary +10vdc spike), and gate signal
> (+10vdc while any key is held down). The keyboard cv is 1 volt per octave
> (same as moog), but the gate signal on a moog is a connection to ground
> instead of a positive voltage. You can convert the ARP gate to moog sink
> trigger by using a simple circuit. Run the ARP gate through a 10K resistor
> to the base of a 2N4401 transistor, connect the emitter to ground, and the
> collector becomes a switch to ground whenever the ARP gate signal is
> present. Good luck with your project.
>
> Tim Curtis wrote:
>
> > I have an ARP 3604p keyboard that I picked up with the intent of talking
> > a friend into selling me his keyboardless 2600.  Well, he found a
> > keyboard as well, so I still have this 3604p here.
> >
> > The first thing I'm thinking of is that I'm starting to put together a
> > modular Moog system, which I don't have a keyboard for.  Would there be
> > any way to mod the ARP keyboard to work?
> >
> > Can anyone suggest any other possibilities?  I read that someone built
> > an interface to allow the 3620 to be used with any other CV/gate gear.
> > Would that be possible here?
> >
> > Thanks,
> >
> > Tim