Cgs synth

:)

It isn't often that an odd value cap like 5n6 or 6n8 is specified. If it is,
then you can bet there is a reason!

Ken

>Thanks for your help, Ken--I appreciate it. The capacitor was the problem. I
>foolishly substituted a 4n7 for the 5n6, thinking that it would be close
>enough. My bad! I put a 1n in parallel and the Grinder works much better
>now. It produces a much wider and more interesting range of timbres.
>
>Overall it's a very cool module, BTW. I set it up in a 3U panel in my
>mostly-MOTM system, with all three modules (multiplier, simple folder, and
>grinder) available on separate jacks.
>
>--Adam
>
>> -----Original Message-----
>> From: sasami@... [mailto:sasami@...]
>> Sent: Saturday, October 01, 2005 5:11 PM
>> To: cgs_synth@yahoogroups.com
>> Subject: RE: [cgs_synth] Finally! The Wave Multiplier is built.
>>
>> See the small "ringing" at the bottom of the lower "square" wave? You
>> should
>> be seeing that at about 5-10 times the amplitude on both the top and
>> bottom
>> excursions from a squarewave input. You are seeing ringing, but it appears
>> to be happening across the whole signal. Do you have the correct capacitor
>> in the feedback loop?
>>
>> Ken
>>
>> >I still don't fully understand what I should expect from this module. I
>> >listened to the sample file in the yahoo group archive, and since I don't
>> >know what the original signal was, I can't glean much insight.
>> >
>> >Since you said that an oscilloscope can help choosing an op-amp that does
>> >the right thing, here's a screen shot of a square wave run through my
>> >Grinder section, with both controls set to their middle position:
>> >http://studionebula.com/images/CGS-WM-graph.jpg
>> >
>> >Here's an audio file of its output, same square-wave input:
>> >http://studionebula.com/sounds/modular/CGS_WM_test.mp3
>> >In this file I start with both controls rotated fully CCW. I turn one all
>> >the way up and then all the way back down, then the other all the way up
>> and
>> >all the way back down, then one up to its middle position and leave it
>> >there, then turn the other up to its middle position. If you can't tell
>> >which knob is which, then you're understanding my point. :-)
>> >
>> >Thanks in advance to any other Wave Multiplier owners who can take a
>> >look/listen to these files and tell me whether or not mine seems to be
>> >operating properly.
>> >
>> >--Adam
>> >
>> >> -----Original Message-----
>> >> From: sasami@... [mailto:sasami@...]
>> >> Sent: Sunday, September 25, 2005 3:58 PM
>> >> To: cgs_synth@yahoogroups.com
>> >> Subject: RE: [cgs_synth] Finally! The Wave Multiplier is built.
>> >>
>> >> Basically the grinder is exploiting exactly what you DON'T want in a
>> >> typical
>> >> servo system (such as the feedback of an op-amp. It causes the op-amp
>> to
>> >> overcompensate, then overcompensate in the reverse direction etc,
>> >> effectively causing a high pitch ringing on the output wave. If you
>> have
>> >> an
>> >> oscilliscope, it can help choosing a chip.
>> >>
>> >> Ken
>> >>
>> >>
>> >> >I am also happy with my recently completed Wave Multiplier, although I
>> am
>> >> >somewhat non-plussed by the Grinder section. It seems that its two
>> >> controls
>> >> >have basically the same effect on the timbre, although with slightly
>> >> >different ranges of operation and some interdependence. It also sounds
>> >> more
>> >> >like a resonant filter than something I'd describe as a "grinder". Do
>> >> other
>> >> >Wave Multiplier owners observe similar behavior in their grinders, or
>> is
>> >> >there something wrong with mine?
>> >> >
>> >> >--Adam
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >> >
>> >> >Yahoo! Groups Links
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> _______________________________________________________________________
>> >> Ken Stone sasami@... or sasami@...
>> >> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>> >> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>> >>
>> >>
>> >>
>> >>
>> >> The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >>
>> >> Yahoo! Groups Links
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> >
>> >
>> >
>> >The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >
>> >Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> _______________________________________________________________________
>> Ken Stone sasami@... or sasami@...
>> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>>
>>
>>
>>
>> The CGS Modular Synth home page: http://www.cgs.synth.net/
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>

_______________________________________________________________________
Ken Stone sasami@... or sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>