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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
CGS29. Attempting to test. Need some help..
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mubase



Joined: Mar 24, 2011
Posts: 110
Location: London UK
Audio files: 5

PostPosted: Sun Sep 01, 2013 11:49 am    Post subject:  CGS29. Attempting to test. Need some help.. Reply with quote  Mark this post and the followings unread

Hi Everyone again.
In the process of building my first modular (CGS) I have assembled the CGS29 Wave multiplier. I have read through the Description of how to use it but I am a bit baffled about testing it.

Could someone please explain to me which I/Os to connect to..

If I plug a tri-wave into the lockhart in, sure enough I get a tri or square out of the Lockhart outs... But plugging an LFO into triangle in doesn't do anything nor do the fold pots...
Connecting the F-out to my mixer/amp setup produces a very quiet output..
Also, where do I plug the grinder out...
Basically I would like to ask if someone can help me to set up the board properly..i.e tell me what ins and outs go to which I/Os on the board . I have read Ken's description but I am a bit lost...
Please help!! scratch

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sneakthief



Joined: Jul 24, 2006
Posts: 529
Location: Berlin

PostPosted: Sun Sep 01, 2013 12:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

My Wave Multiplier is setup to have 3 discrete sections:

Wave Multiplier:

- Triangle in/out
- Square in/out

- Folds CV in
- PWM CV in
- Offset CV in (the offset CV pot will also have an effect without anything plugged into it)

(Note: the Folds, PWM and Offset only pots affect this section)


Lockhart:

- Input
- Triangle out
- Square out

(Note: the Lockhart pot only affects this section)


Grinder:

- Input (preferably a sine)
- Output

(Note: the Drive and Lag pots only affect this section)

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mubase



Joined: Mar 24, 2011
Posts: 110
Location: London UK
Audio files: 5

PostPosted: Mon Sep 02, 2013 4:54 am    Post subject: RE: CGS29 wave multiplier Reply with quote  Mark this post and the followings unread

Hi Sneakthief. Thx for giving me the lowdown. So they ARE seperate sections...

My control layout will be as in the picture:

I've managed to get the lockhart folder working, feeding in first a triangle wave to the ac and dc inputs via a 100K pot. Sounds good!
I've tried going out of the lockhart into the grinder and out of the grinder into the mixer/amp...some effect but the grinder pot doesn't do anything.

I have tried putting in a triangle wave to the multiplier/folder section's triangle input and connecting f-out to the mixer/amp but
The triangle and pulse inputs of the wave multiplier/folder section seem to be faulty/ no detected I/O. So I'll go back to the schematics and do some testing!


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The Bad Producer



Joined: Mar 08, 2009
Posts: 255
Location: The Manhole

PostPosted: Mon Sep 02, 2013 2:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey µbase,

This may sound silly, but your post kind of reminded me about when I built this some years ago... It was one of the first things I built, and I'd had it in the rack since I built it, but never really thought it was that great, seemed ok but not as amazing as i thought it should be... Anyway, at some point it ended up in a box and just recently I picked it up and thought 'what the hell was that about'... Turns out I hadn't put any of the wire links in place on the PCB... 5 minutes later and "oooohhh, right... that's how it should sound!"

Not really suggesting that is the problem, just an aside really, but you did put them in?! hahaha! (I say all that but the latest version is double-sided, so ignore me!)

And yeah, consider it as three modules really... Which PCB version do you have?

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mubase



Joined: Mar 24, 2011
Posts: 110
Location: London UK
Audio files: 5

PostPosted: Fri Sep 06, 2013 12:39 pm    Post subject:  RE: CGS29 wave multiplier Reply with quote  Mark this post and the followings unread

Hi! Well heres an update. I have version 2.
Since I posted I've done a bit of fault finding and found that there was a dead solder joint between the triangle wave input resistor and the lm324 pin 2. I fixed this and after found out that the CA3080 was dead. Luckily I have some more CA3080s so I inserted a new one and proceeded to be blown away by how bloody amazing this module is!!! Shocked
Putting an audio range triangle wave into the tri input and a slow square wave into the sqr input with a triangle LFO produced some blinding results and this is just one trillithird of the possibilities of the board!!!
I filmed a demo of it but its a little distorted due to the phone mic being a bit overwhelmed:
http://www.youtube.com/watch?v=edy-2SAbzsw

Smile

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