Help identifying coupling caps

[megatrav]

I have 2 Citrus Press (JHS Pulp n Peel) boards from Effects Layouts.
I am going to build one as stock but I would like to build the other as a the “Lime Aid” version.

Josh Scott mentioned on a Facebook post that the only difference is the coupling caps.

I know that increasing the value will allow more bass through.

So, I need some help identifying which are the coupling caps

 

[jwin615]

C1, C4 and a maybe C2
Increasing would let more bass pass
Decreasing C7 and C9 would restrict the bass.
Not sure what the Lime Aid is, more/less bass
You'll want to do the math on any filters these caps are part of as well.

 

[jwin615]

You could tweak the filter in the feedback loop of IC1B as well as I don't think it's doing anything.

 

[megatrav]

Not sure what the Lime Aid is, more/less bass

The Lime Aid is a modified Pulp N Peel. They use the same board.
According to Josh Scott, the main difference is the value of the coupling caps.

 

[megatrav]

bump

 

[benny_profane]

bump

https://forum.pedalpcb.com/threads/help-identifying-coupling-caps.26369/post-337481

 

[giovanni]

You could tweak the filter in the feedback loop of IC1B as well as I don't think it's doing anything.

Isn’t that network necessary for the compressor to work properly? I’m not familiar with compression circuits.

 

[jwin615]

Isn’t that network necessary for the compressor to work properly? I’m not familiar with compression circuits.

I just assumed it was tone shaping to restore highs. Didn't do the math on it.
Edit to add, was speaking of C6 in particular.
This is just a Armstrong Orange Squeezer with a buffered blend.
Decent write up here:

https://drybell.com/wp-content/uploads/2024/11/orange-squeezer-circuit-description-DM1044-written-by-drybell.pdf

 

[LukeFRC]

it's interesting - on a compressor you might want more bass in the signal, but less into the detection circuit so the thump of your E string doesn't over compress...

 

[LukeFRC]

or B string if you're that way inclined

 

[megatrav]

https://forum.pedalpcb.com/threads/help-identifying-coupling-caps.26369/post-337481

Just wanted confirmation.

I tried to research it on my own but wanted to be confident.

Guess I’ll be using sockets!

 

[jwin615]

What's the audible difference between the two JHS pedals?
We just don't know the objective...

 

[megatrav]

What's the audible difference between the two JHS pedals?
We just don't know the objective...

I haven’t played the Lime Aid but in my experience, the PulpnN Peel cut off is around 80-100hz
I’d like to get it lower for sure

 

[benny_profane]

With the stock values on the clean path, virtually nothing is being filtered. Adding more bass signal to the comp path would most likely negatively affect the performance of the comp (i.e., lower frequency guitar signals can have a higher amplitude, causing an imbalance in the detection circuit).

I’m inclined to think this is a hacky approach wherein a different topology would be better suited. I’ve found VCA comps to handle low tunings/bass much better than optical or JFET comps—the latter typically relying on clean blend to retain low end attack without overwhelming the frequency balance.