Ms-20 filter is alive!!
1999-03-30 by Paul Schreiber
Great news!
The MS-20 filter "section" is working on the hand-wired breadboard. All 3
modes (HP/LP/Notch)
work great. Reso can be adjusted to kill squirrels at 50 paces.
I need to snarf my buddy's MS-20 this weekend and give it the A/B ear thing.
By then I will have
2 VCOs built up so finally a real "synth" emerges from the quagmire.
Kit difficulty will be about like a '120. 2 trims, but these are all by ear
(cutoff @ 0CV and reso madness).
I suppose for people building poly syths, you need to trim the cutoff with a
scope (to match sections the same).
We now have an official price: MOTM-420 is $159 kit, $219 assembled. The
price is slightly high due
to the number of jacks/pots and the 1V/octave tracking (tempco resistor +
PNP matched pair). Save some heat goop!
The panel (attn: Dave!) is looking like:
CUTOFF RESO
MOD 1 AUDIO 1
MOD 2 AUDIO 2
MODE AUDIO 3
1V/O CV1 CV2
IN1 IN2 IN3 OUT
Hopefully Dave B. will find 3 audio ins and 3 CV ins sufficient <grin>. Has
anyone picked up that
this means no audio mixer module is needed immediately ? <hee hee>. And as a
bonus MOD 1 can
be set for - to + sweeps over s 3 octave/v range. Yeee Haaaaa!!
Lastly, may add a "we are clipping you moron" LED but I am seeing too much
part-to-part variation
for my liking.
Now I can breath a little easier and get those VCOs out the door! Spent 5
hours de-glitching the sine wave,
and I think I got it at a minimum.
Feel free to send in your '420 orders early!! Subscribers will get 1
automatically, as usual. Estimated ship
date is 1st week of May or perhaps sooner if the VCO mailing goes smooth.
Paul Schreiber
PS: the website in the month of March has transferred over 2GB of data! A
new record! Thanks, Keyboard!
The MS-20 filter "section" is working on the hand-wired breadboard. All 3
modes (HP/LP/Notch)
work great. Reso can be adjusted to kill squirrels at 50 paces.
I need to snarf my buddy's MS-20 this weekend and give it the A/B ear thing.
By then I will have
2 VCOs built up so finally a real "synth" emerges from the quagmire.
Kit difficulty will be about like a '120. 2 trims, but these are all by ear
(cutoff @ 0CV and reso madness).
I suppose for people building poly syths, you need to trim the cutoff with a
scope (to match sections the same).
We now have an official price: MOTM-420 is $159 kit, $219 assembled. The
price is slightly high due
to the number of jacks/pots and the 1V/octave tracking (tempco resistor +
PNP matched pair). Save some heat goop!
The panel (attn: Dave!) is looking like:
CUTOFF RESO
MOD 1 AUDIO 1
MOD 2 AUDIO 2
MODE AUDIO 3
1V/O CV1 CV2
IN1 IN2 IN3 OUT
Hopefully Dave B. will find 3 audio ins and 3 CV ins sufficient <grin>. Has
anyone picked up that
this means no audio mixer module is needed immediately ? <hee hee>. And as a
bonus MOD 1 can
be set for - to + sweeps over s 3 octave/v range. Yeee Haaaaa!!
Lastly, may add a "we are clipping you moron" LED but I am seeing too much
part-to-part variation
for my liking.
Now I can breath a little easier and get those VCOs out the door! Spent 5
hours de-glitching the sine wave,
and I think I got it at a minimum.
Feel free to send in your '420 orders early!! Subscribers will get 1
automatically, as usual. Estimated ship
date is 1st week of May or perhaps sooner if the VCO mailing goes smooth.
Paul Schreiber
PS: the website in the month of March has transferred over 2GB of data! A
new record! Thanks, Keyboard!