[sdiy] MS-20 clone LEDs

[Scott Stites]

Hi Pat.

With low resonance, the LED's emit no light.  As resonance increases, they
get brighter and brighter.  If you have the filter tuned for a very low
frequency with high resonance, you can actually see the LED's alternate with
each half of the waveform.

Kewl filter, BTW.  I really like the high pass mode, too.  With that mode,
if you input a sawtooth from a single VCO and crank the resonance way up
with nothing modulating it (except the keyboard voltage), the resonance
tracks the keyboard and you actually get some really nice *sub* harmonics
out of it by carefully adjusting the freq control.  Makes it sound like you
have more than one oscillator synced to it.

Cheers,
Scott


----- Original Message -----
From: "Pat Kammerer" <spivkurl at wearerecords.com>
To: "sdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, December 14, 2004 6:22 PM
Subject: [sdiy] MS-20 clone LEDs


> Hi all,
>
> I'm finally getting around to building Rene and Jorge's MS-20 clone, and
> have a quick question.  Do the two green LED's which are used as diodes in
> this filter emit light, or not?  If they do, can anyone explain what they
> actually respond to/ indicate?  I'd like to put them on the panel, unless
> they are always off visually.
>
> This is my first etched module, so it's exciting to be stuffing the board!
>
> Thanks for your help!
> Pat
>