Paralizer / Panner for combine two BM

[Sophia2001]

Hi all,

Let me first explain what I am trying to achieve. I would like to combine 2 variants of the Big Muff. I want to use a potentiometer to dial in the effect BM1 vs BM2. Therefore, I use the JMK paralizer schematic. I also want to dial in the original guitar sound vs paralizer effect sound. Therefore, I use the JMK panner schematic.

So in summary:



JMK panner schematic: http://jmkpcbs.com/wp-content/uploads/2014/03/Panner.pdf
JMK paralizer schematic: http://jmkpcbs.com/wp-content/uploads/2014/10/Paralyzer.pdf

My question is: Can I just combine these schematics or do I need to adjust something to it? Both BM circuits starts with a diode (1n4001), a large capacitor and a R=1M. The Paralizer and Panner also have an 1n4001 and a capacitor in front. Are these still needed in the BM schematic?



Thanks!
Sofia 

[FiveseveN]

Both BM circuits starts with a diode (1n4001), a large capacitor

No, those are not in the signal path, they're for polarity protection and filtering, respectively.

I also want to dial in the original guitar sound vs paralizer effect sound. Therefore, I use the JMK panner schematic.

The JMK panner has a 100K input impedance, which is a significant load for passive pickups. I would use a non-inverting buffer as the first stage instead of the inverting one.

Big Muffs have volume pots so you can just use a passive mixer (two resistors) and set their balance by turning one up and the other down. Does the convenience of having a single blend pot justify building an active circuit? You could also get away with a passive blend.

[Sophia2001]

Thanks FiveseveN,

I realize that my questions are maybe a bit stupid...? My knowledge of schematics is limited. I do know how to read/breadboard them, but I do not really understand what is happening and what the function is of each component within the schematic.

Both JMK Panner and Paralizer start with this bit of schematic:


me

1) By using this schematic only for the panner (first in the row), it will be sufficient? I could remove this part of the Paralizer and the 1n4001/capacitor of the BM?
2) Could you explain what you mean with a non-inverting buffer instead of the 100K?
3) for the active vs passive blend: I would also like to experiment with an BM and OC2 combination. The OC2 does not have an volume pot so an active blend is needed, correct?

Sofia 

[FiveseveN]

1. That snippet is also for filtering, polarity protection, plus provides the mid-supply reference for op-amp biasing. If you're going to build the Panner and Paralizer in a single box then you don't need to replicate it, one can power both circuits. I don't get what the Muffs have to do with it though, are they also going in this same box?

2. Voltage follower (unity buffer amplifier). Compare with Inverting amplifier further up the page.

3. The OC2 doesn't have a volume pot, it has three: one for the dry signal, one for 1 octave down and one for 2 octaves down. Essentially the same approach to mixing as I suggested.