Cool. Thanks for explaining that. So, the reason you tap into the power supply is that to amp the signal or what is it's purpose? I seemed to have problems losing patches when I used the power supply hook in like you show.
Thanks,
Joseph
Atom Smasher <atom@...> wrote:
On Fri, 1 Apr 2005, Joseph Ralston wrote:
> Can you explain why? Thanks, Joseph
================
if you look at the ~official~ diagram
<http://synthmod.net/korg/moog_slayer/> you'll see that both knobs serve
as variable voltage dividers. that means that FTMP the actual values of
the knobs don't matter...
voltage divider:
let's say i have a pot with 10V across it. if the slider is 100% CCW it's
at 0V; at 100% CW it's at 10V; in the middle it's at 5V. that's the same
whether i'm using a 10 ohm pot or a 10M pot.
of course, if i where using a 10 ohm pot, it would draw 1A (regardless of
the arm's position). that would cause problems. so, we want to avoid using
a pot that's of too low resistance.
OTOH if we use a 100M pot then the [tiny] current drawn through the wiper
arm becomes relevant and interferes with the behavior of the circuit. so,
we want to avoid using a pot that's of too high resistance.
50K works fine. it seems that 100K also works fine. i suspect that even a
250K would be fine. but beyond 500K or 1M i suspect that it would cause
undesirable results, noticeable as an apparent nonliterary in the range of
the knob.
at the other extreme, i'm sure a 25K pot would work fine. but as the value
of the pot gets lower, the current drawn through it rises... that could
cause problems in the form of melted pots and smoked power supplies.
so, my official recommendation is 50K, but you'd also have my blessings if
you use 100K.
--
...atom
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RE: [korgpolyex] Re: Failed Moog Slayer MOD
2005-04-01 by Joseph Ralston