Attaching standalone controls is not too difficult, although the
following details should be observed:
The KLM-368 has three logic lines to select effect mode. If all lines
are low (0V), then the effects are turned off. Each individual line
enables a particular effect mode: chorus, phase or ensemble when taken
high (+5V). I am unsure what response happens of more than one mode is
enabled at once. Chrous mode is CN03-2, phase mode is CN03-3 and ensemble
mode is CN03-4.
In addition, there are four control voltages. Effect Speed is achieved
by using a 50K linear potentiometer with CCW lug at -5V, CW lug at +5V and
the wiper lug to CN03-1 on the KLM-368.
There are ∗3∗ volume level inputs. One is to reduce the gain as the
filter resonance increases, one is the attenuator level as set by the VCA
attenuator switch and controlled by a 4-bit DAC. The last input is the
VCA modulation CV for things like tremolo. Of these, I would just use the
VCA mod input and wire the others (CN03-6, CN03-7) to +5V through 1K
resistors.
The VCA mod input (CN03-5) can be a potentiometer wired like the Effect
Speed line above.
The first thing I would do, however, is just try to get the Polysix
running again. If you need a new KLM-367 MCU, I have one I can send you
for cheap.
Crow
/∗∗/
On Fri, 17 Oct 2003, trekpilot wrote:
> problem I have is, what circuits are required to connect the effect
> select switch and level control to the board? I assume that the effects
> board needs some kind of signal from the programmer section, but I want
> to just connect the pots themselves to the 386A with a minimum of extra
> circuits. Is there a way to do this using the pins on CN-03? Please
> help, it would be greatly appreciated. As a side note, all of the other
> parts from my Polysix are available for sale or trade, I have been
> advised that the Programmer IC is possibly damaged, but all of the other
> boards, pwr supply and case are available. Please let me know if anyone
> is interested in these parts, and thanx for the tech advice. Would also
> love to get my hands on a similiar Korg analog machine. Regards,
>
> T. Cardinal