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Issues Converting Guitar Effects to Eurorack Modules.
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Issues Converting Guitar Effects to Eurorack Modules.
Raleigh
I posted this same post on the general Eurorack thread, but no replies so figured maybe this was a better place for it.

I have two guitar effects pedals I want converted into modules in my Eurorack setup. I'm just getting into modular, currently only have two modules. I understand basic electronics, I own a decent oscilloscope, and have etched PCBs myself, etc. However until now, I've never worked with a bipolar power supply, and I'm still wrapping my head around it actually. I get that its like two power supplies in one.

So I have a nice Tube Driver pedal that runs on 9 volts, and a Digitech Talker which is kind of like a vocoder that runs on 9.75 volts. Can I just add two voltage regulators (an LM317) between the power inputs of the pedals, and the Eurorack power-source, lowering the voltage to the proper 9v and 9.75v, from the positive 12 Volt rail and the ground rail and be done with it, so the -12v isn't attached to anything or, would I have to incorporate the -12 volt rail into it somehow? My guess is probably not? I hope I expained that well enough?

I bought the Talker in the 90s for under $100, now used it goes for over $300, rumors have it that Cher used this in her "Believe" hit and also supposedly Daft Punk used it quite a bit. I have for a long time wanted to change the set up, desoldering then rerouting the input and outputs, the knobs and leds of the Digitech Talker to one front panel. Its a great little effects box, and becomming somewhat rare to find, but I never used it much because its clunky and a pain to set up. Having everything on a single panel will free this effect and should work much better for me. I just don't want to fry it in the process.


Thanks in advance!
mskala
Yes, you can just regulate the +12V down to +9V and not connect the -12V. However, you'll also have to deal with the very different signal levels between the pedals and the modular - attenuate the modular signal down to instrument level to go into the pedal and then amplify it back on the other side - and that's likely to be more complicated than dealing with the power supply voltage.
Raleigh
Thanks Mskala... I wonder what goes into fixing that end? Some combination of resistors going to the inputs of the pedals, and an opamp going out maybe?
masterofstuff124
https://cgs.synth.net/modules/cgs60_sba.html
Raleigh
Hey, very cool! Thanks for the link, Masterofstuff! Looks like just what I needed! Noticed I'm not too far from you, I'm located in Naples. Did you survive Irma without any major issues? Power was out here for two weeks, longer for some. However I left the state for a few weeks.
Jay F.
ken's stomp box adapter is cool, but attenuation is fixed (about 26dB) and there is no mix between dry and effect signal.

The adaptation circuit I made include variable input and output gain as well as a dry-wet pot :
https://growyoursynth.blogspot.be/2017/09/guitar-effect-in-eurorack-mo dule.html
Raleigh
Ok, very good... I'll have to look over your circuit again here. Definitely would like to get it right. I like variable inputs and outputs as well as having wet/dry variation!
fuzzbass
Jay F. wrote:
ken's stomp box adapter is cool, but attenuation is fixed (about 26dB) and there is no mix between dry and effect signal.

The adaptation circuit I made include variable input and output gain as well as a dry-wet pot :
https://growyoursynth.blogspot.be/2017/09/guitar-effect-in-eurorack-mo dule.html


Clever little thingie and I have one. Allows you to use your pedals without modification.

The circuit description tells you which resistors you can change to potentiometers or switched networks. But there are three practical signal levels to deal with: 800mv (guitar pedal), 1.2v (final or line) and 10v (synth). There are three adapters on the board so you can fix them in this way. Also, ins and outs are not connected inside, so you can preset them, then mix and match attenuation and makeup stages depending on the situation.

How I did mine (I can't remember the actual resistor values I used, sorry)
1. A: attenuate 10V to 800mv B: make up 800mv to 10v
2. A: attenuate 10V to 800mv B: make up 800mv to 1.2v
3. Attenuate 10V to 1.2v B: unity gain (buffer)

The first one allows putting pedals in line in the signal flow. The second allows putting pedals as final stage. The third allows using a line level effect processor for final processing.
plushterry
Jay F. wrote:
ken's stomp box adapter is cool, but attenuation is fixed (about 26dB) and there is no mix between dry and effect signal.

The adaptation circuit I made include variable input and output gain as well as a dry-wet pot :
https://growyoursynth.blogspot.be/2017/09/guitar-effect-in-eurorack-mo dule.html



Thanks, this is great. I'm working on a multiband saturator and this will come in handy SlayerBadger!
mangros
I've never got round to trying this type of thing out:

http://www.muzique.com/lab/pickups.htm
https://www.diyrecordingequipment.com/products/ppe

They are supposedly 'better' for putting synths through guitar pedals than just dropping the levels via an opamp. Anyone tried anything like this?

I use pedals loads and I've never been disappointed with CGS60 or a mixer aux send, but I might be missing out...
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