Uni-Vibe Wet Dry Dial MOD!

nznat

nznat

Member
Hello.
I have this uni-vibe i built from, the diagram attached. Its pretty good. What i want to do is put a wet / dry dial on the pedal.
The reason is, the pedal schematic has a really nice pre-amp in it, and also the vibe is pretty good, yet a lot of pre-amp tone comes through, and i want to be able to dial more vibe effect into the mix and remove some of the pre-amp effect. I'm sure ill get a much better vibe effect that way.
Any ideas anyone, or who can i talk to about this adjustment / where on the circuit could this wet / dry be added. i.e. both pre-amp and unvibe effect are seperate parts in the circuit, so i want to be able to shift percentages of each = like having 30 percent pre-amp and 70% univibe effect. Yes i know, the preamp is essential for the tone, but even a 10% shift would create a big vibe effect taking place without the pre-amp getting lost, because the pre-amp goes above unity, so should be fine.
thanks
 

Attachments

Big Monk said:
View attachment 47907

That’s where you’d put it but I’m unsure what you are trying to accomplish.

Why not just turn the volume down?
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turning down the volume, lol, that would do anything other than turn down the entire pedal, vibe volume included. And that picture of , "this is where you would puty it"??? Put what? got a diagram of the circuit to add? im trying to bring forward the vibe effect to over shadow the pre-amp, as if the vibe effect itself has its own volume. No the pre-amp and vibe effect are NOT the same thing, they are two different circuits, but im not sure exactly where or how to add what im after
 
Big Monk said:
Yes. It’s what you say to someone when you wish them the best in their endeavors but are no longer interested in helping.
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your not interested in helping, or you dont know what to do? its fine either way, but can you point me to someone who would know?
 
Big Monk said:
I know quite a bit about the UniVibe circuit.

You don’t though. So good luck.
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whats going on, you know quite a bit, and you say i dont, and you wont help? i thought this was a forum where people got help with electronics / pedals? is everything ok with you? did i say something wrong. i looked back, i was just asking about a circuit
 
nznat said:
whats going on, you know quite a bit, and you say i dont, and you wont help? i thought this was a forum where people got help with electronics / pedals? is everything ok with you? did i say something wrong. i looked back, i was just asking about a circuit
Click to expand...
Dude, if there was a local Univibe expert....it IS most certainly mr Big Monk FYI
 
Big Monk said:
If you want less Preamp, you turn the volume down.

Typically, blend controls are about getting LESS effect.

It sounds like you might want a cleaner Preamp at unity gain.

Other than that I’m not sure what you are asking.
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On stock vibes, preamp controls entire pedal, effect and volume increases or decreases when volume / gain is adjusted. they are linked.
A blend control is about either having vibe or volume / preamp tone being higher or lower than other.
No cleaner preamp needed.
The vibe has an effect section (vibe section) and a separate preamp drive volume section.
I'm wanting to blend these with one knob. Turn clockwise and the gain drops and the vibe effect increases, or turn anticlockwise and vibe decreaees and gain increases. I understand your line drawing you showed me, yet its not very clear, and what circuit goes in that line?
 
this sort of gives an idea that it can be separated?
 

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  • Screenshot 2023-05-06 135203.png
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Big Monk said:
The issue is the input goes through the Preamp. The Preamp and Phase sections are mixed prior to the volume.

The gain of the Preamp is not tied to the Intensity of the phasing in a way that can be separated.
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or this area of a vibe circuit? the output mix mod
 

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  • Screenshot 2023-05-06 134910.png
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you mean change both 100k resisters to 91K, and add a 20K trimmer pot. how will that increase throb? just trying to get my head around that part. sort of seeing it
 
Big Monk is killing it. I was about to say something similar, but with 47k/100k pot/47k. That would be more range, but big monks method of more fine tuning might work better. So play around with it. You could also try 75k/50k pot/75k. The idea is that at the center of the pot, it comes out to 100k/100k.
 
phi1 said:
Big Monk is killing it. I was about to say something similar, but with 47k/100k pot/47k. That would be more range, but big monks method of more fine tuning might work better. So play around with it. You could also try 75k/50k pot/75k. The idea is that at the center of the pot, it comes out to 100k/100k.
Click to expand...
so this is not a type of bias mod for bulb, completely different area eh. As i have a bias mod and it made a huge difference at getting a better throb. Yet here, my only goal is to have the entire vibe circuit and effect come forward more wet and sort of over shadow the output, slightly. just jump up more, will bring out more vibe effect?
 
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