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 Forum index » DIY Hardware and Software
Using a guitar pedal for my modular
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elmegil



Joined: Mar 20, 2012
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PostPosted: Sun Jun 09, 2013 6:14 pm    Post subject: Using a guitar pedal for my modular Reply with quote  Mark this post and the followings unread

I have come into ownership of a Rebote 2.5 Delay PCB from Tonepad.com (bought at a sort of a garage sale).

I don't have a lot of interest in using it with a guitar, but I would like to use it in my modular. I happen to already have the PT2399 delay chip for it, so it should be an easy build.

The question I have is what should I do about signal voltage levels?

I've read through Ken Stone's pages about going the other way, using his stomp box adapter to use modules as guitar pedals, but I only see a brief mention of using an attenuator for the output, but don't even see the attenuators in the circuit.

I'm not having any great luck finding anything about going pedal to modular anywhere else either.

Any advice?

Thanks....
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-minus-



Joined: Oct 26, 2008
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PostPosted: Sun Jun 09, 2013 11:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have built several of the CGS stomp box adapters to use in my logic synth. All I know is that without them I was hammering the inputs of the pedals with close to 12V and the pedals were not dealing with this at all. I breadboarded the CGS adapter and hey presto- it worked. It's a simple circuit. I made three of them on a piece of stripboard. Give it a try on breadboard and see what you think.
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-minus-



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PostPosted: Sun Jun 09, 2013 11:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's the layout I did for stripboard. Sorry it's so rough. If you only wanted one adapter, just use the top third of the layout.


CGS 60 Stompbox adapter copy.jpg
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CGS 60 Stompbox adapter copy.jpg


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LFLab



Joined: Dec 17, 2009
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Location: Rosmalen, Netherlands

PostPosted: Mon Jun 10, 2013 2:15 am    Post subject: Reply with quote  Mark this post and the followings unread

+1 For the Ken Stone circuit.
I did a layout and etched some boards for it, works fine. IIRC I did change the attenuator and gain to further reduce and amplify signals, because I still had pretty large signal swing going into the pedals when I built it stock.
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mph



Joined: Aug 25, 2007
Posts: 67
Location: France

PostPosted: Mon Jun 10, 2013 2:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes the Ken Stone adapter is a must have for anyone who's got pedals!
I also use it to feed my pedalboard with high levels signals (anything like line outputs from a mixer works fine too).
The schematinc is really simple so it's easy to build a custom version from scratch on perfboard too.
Really it changed my life Cool
edit: try to send some drums in a Tech21 Sansamp with this circuit Wink
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elmegil



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PostPosted: Mon Jun 10, 2013 5:04 am    Post subject: Reply with quote  Mark this post and the followings unread

I guess I didn't read his page right because I thought it was for using a module as a stomp box, not the other way around.

Thanks for the strip board layout, minus. I'll spend more time understanding that.

Thanks!

Edit: DUR that's what I get for letting google take me straight into his site. It's pretty obvious when you look at the list of modules Embarassed
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fluxmonkey



Joined: Jun 24, 2005
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Location: cleve

PostPosted: Mon Jun 10, 2013 6:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

cgs46 = use a module as an effect pedal
cgs60 use effect pedal as a module

elmegil wrote:
I guess I didn't read his page right because I thought it was for using a module as a stomp box, not the other way around.

Thanks for the strip board layout, minus. I'll spend more time understanding that.

Thanks!

Edit: DUR that's what I get for letting google take me straight into his site. It's pretty obvious when you look at the list of modules Embarassed

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elmegil



Joined: Mar 20, 2012
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PostPosted: Mon Jun 10, 2013 7:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeps, saw that this morning and so the edit. Felt like a maroon.

Stripboard still very helpful though Smile
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synthcube



Joined: Dec 21, 2011
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Location: boston

PostPosted: Tue Jun 11, 2013 10:42 am    Post subject: Reply with quote  Mark this post and the followings unread

More 'blush' or ' rose' than 'maroon' but we take your point Smile
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elmegil



Joined: Mar 20, 2012
Posts: 1472
Location: Chicago
Audio files: 14

PostPosted: Tue Jun 11, 2013 10:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks pretty straightforward to build one stage of the stripboard, piggyback the tonepad board at the other end of the stripboard, and just wire it as a simple module.

If I want to get really crazy, maybe I'll try using a vactrol for CV of the delay time Very Happy
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