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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Opinions for CGS wave multiplier build
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numbernone



Joined: Aug 16, 2006
Posts: 477
Location: new york city

PostPosted: Mon Feb 05, 2007 9:18 pm    Post subject: Opinions for CGS wave multiplier build Reply with quote  Mark this post and the followings unread

OK, so the Wave multipler can be built in any manner of configurations, of which I have seen several. I would like to hear some opinions on what to include. It will be going into a mutated serge style panel with many other goodies, and economy of space is a must. What do the grinder and lockhart have to offer me?? I have heard lots of samples and most seem to neglect both. Also, it will be bananas, so the external offset and its switching jack may be a stinker. what delights am I missing if it is omitted??
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6079smith



Joined: Jan 18, 2007
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PostPosted: Tue Feb 06, 2007 9:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,
I made one of these not long ago (though it's still on a cardboard front panel). The three drone samples below should give an idea of the Lockhart folder and the Grinder. Both are swept manually. I had a bit of a space problem too, so I've put in a switch for AC or DC input for the Lockhart. Otherwise, everything else is there. If I had to make the choice, I'd lose the Lockhart, purely because the Grinder is more interesting to my ears. And who wouldn't want the word 'GRINDER' emblazoned on the front of their modular?
As for the switching jack for the external offset... you'd lose some modulation capabilities, to be sure. I'm kind of at a loss as to a solution, sorry...

That was a long first post.
Hi all.


triwavethrugrindermp3.mp3
 Description:
triangle wave through grinder...

Download
 Filename:  triwavethrugrindermp3.mp3
 Filesize:  394.19 KB
 Downloaded:  1100 Time(s)


sawwavethrulockharttri outmp3.mp3
 Description:
sawtooth wave through lockhart, triangle output

Download
 Filename:  sawwavethrulockharttri outmp3.mp3
 Filesize:  189.29 KB
 Downloaded:  988 Time(s)


triwavethrulockhartsqroutmp3.mp3
 Description:
triangle wave through lockhart, square out

Download
 Filename:  triwavethrulockhartsqroutmp3.mp3
 Filesize:  238.27 KB
 Downloaded:  893 Time(s)


metalshopsequencemp3.mp3
 Description:
silly sequence with lots of twiddling

Download
 Filename:  metalshopsequencemp3.mp3
 Filesize:  1.38 MB
 Downloaded:  889 Time(s)

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sneakthief



Joined: Jul 24, 2006
Posts: 569
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PostPosted: Tue Feb 06, 2007 12:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

I disagree! I think the Lockhart is as equally cool as the Grinder.

I used almost everything here except the AC Lockhart input and the three inputs that Ken labels as "optional". So almost everything seemed to fit in a reasonable amount of space:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Feb 06, 2007 2:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

sneakthief wrote:
I used almost everything here except the AC Lockhart input and the three inputs that Ken labels as "optional". So almost everything seemed to fit in a reasonable amount of space

i'm with sneakthief and here's my frontpanel:
wavemultiplier

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numbernone



Joined: Aug 16, 2006
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PostPosted: Thu Feb 08, 2007 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Got out my shoehorn and cardboard mock up panel, and fit the whole damn thing in! Even room for a switch to hopefully handle the function from the offset cv jack.

For those who have built this module already, I am pretty clear on what is happening with all the jacks and pots. BUT I am trying figure out whats going on with that offset jack. There must be a way to mimic it with a physical switch. I cant quite figure out what connection is being defeated when the jack is occupied. The schematic does not show anything to reflect the wiring diagram. PLEASE HELP!!!

Thanks.
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fonik



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PostPosted: Thu Feb 08, 2007 11:18 am    Post subject: Reply with quote  Mark this post and the followings unread

EOFS is the PCB connection for an jack socket providing nothing but an 2nd triangle input (external offset=2nd triange input).
OFS is the PCB connection where the offset pot is fed in... (BTW i added attenuators for both tri inputs).
hope i understood your question right!?

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numbernone



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PostPosted: Thu Feb 08, 2007 1:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

I will also be adding pots for all of the inputs. My concern lies on the wiring diagram, the offset input jack is a 3 circuit ( I am using bananas), with the switch connected to one of the +R pads. Apparently this is something witha 1k resistor to keep the +15 supply from going backwards out the jack to whatever is on the other end. I am just trying to figure out how to achieve this without the jack. I suppose I can dump the ext input and just use the manual offset, but I want as much VC modulation as possible. I will keep on racking the old brain.
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6079smith



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PostPosted: Thu Feb 08, 2007 2:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Okay...
The pot has two functions in Ken's wiring; to modulate the incoming 15 volts (when no jack is present) or to modulate the cv signal (when jack is present).
Take a single throw switch. Connect the middle pole to your pot (purple one on Ken's wiring diagram). This is where the signal is going to. Now one side of the switch is connected to +R (the 15 volts through the 1K resistor) and the opposite pole to your banana jack terminal. If you set it up like this, all you have to do is remember to flip the switch if you plug in a jack. I hope this is clear, otherwise say so...

Looks like I got outvoted on the Grinder/Lockhart question...
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numbernone



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PostPosted: Thu Feb 08, 2007 3:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great!!! That is pretty much where I was heading, but you cleared it up quick like. Thanks so very much.
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6079smith



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PostPosted: Thu Feb 08, 2007 4:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

No problem. Let us know how it works out.
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Scott Stites
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PostPosted: Thu Feb 08, 2007 6:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
EOFS is the PCB connection for an jack socket providing nothing but an 2nd triangle input (external offset=2nd triange input).
OFS is the PCB connection where the offset pot is fed in... (BTW i added attenuators for both tri inputs).


Exactly! For me, it's important to have both the capability of starting with an initial value and a means to control the amount of modulation applied to the initial value. IMO, the external offset input is indispensible.

I bought the board on the first run, so there was no Lockhart on it. I use the Grinder on occassion, it's handy for modifying noise signals and the output of the WM itself, but I'd love to have a Lockhart on it, too. A few years ago I rigged a Lockhart up with a simple Vactrol based VCA in front of it and an offset control and input - I was really impressed with it. I intend to work it into a module one of these days.

Cheers,
Scott
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Fernando



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PostPosted: Thu Feb 08, 2007 6:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Scott, did you try to mod the Grinder using a vactrol instead of the 1M pot?

yet, I mean =:)
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Scott Stites
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PostPosted: Thu Feb 08, 2007 6:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very Happy

No, but don't think it didn't occur to me Very Happy

Take care,
Scott
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Pehr



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PostPosted: Sun Jun 07, 2009 4:05 am    Post subject: Reply with quote  Mark this post and the followings unread

6079smith wrote:
Hi,
I made one of these not long ago (though it's still on a cardboard front panel). The three drone samples below should give an idea of the Lockhart folder and the Grinder. Both are swept manually. I had a bit of a space problem too, so I've put in a switch for AC or DC input for the Lockhart. Otherwise, everything else is there. If I had to make the choice, I'd lose the Lockhart, purely because the Grinder is more interesting to my ears. And who wouldn't want the word 'GRINDER' emblazoned on the front of their modular?
As for the switching jack for the external offset... you'd lose some modulation capabilities, to be sure. I'm kind of at a loss as to a solution, sorry...

That was a long first post.
Hi all.


Do you still have the samples? the attahcements seems korrupt.
Could you upload again?

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