ARP 3604p

[Mike Granger]

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