Capacitor for partial coil split

[freefrog]

De gustibus et de coloribus non est disputandum.

andyg_prs : sorry to be unable to explain things in a clearer way. Let's just repeat that a cap at split junction can't do the same thing for both coils because of its location : it's on the HOT side of the first coil and acts therefore like a low-pass filter for it. It's on the GROUND side of the 2d coil and would behave like a high-pass filter for it without the 1st coil...

The most important is that 5spice sims and real life experiments show the same thing: splitting through a cap helps to keep a bit of fatness/output from the 1st coil in the bass/mid ranges. Just keep in mind that with a cap at split junction, the mid "dip" between the two resonant peaks is not due only to the value of the capacitor: it depends also on the specs of the pickup itself. That's why experimenting remains the best solution. If you want the mentioned mid dip to be lower in the spectrum or to be too low pitched to be noticeable, just increase the value of the capacitor used...

FWIW. Merry Xmas to you and to all other readers!

 

[SINGTONE]

So in effect isn't this dimarzio's dual resonance circuit?

 

[freefrog]

DiMarzio Dual-Resonance happens beyond main resonant frequency, in the high harmonics range. One could mimic the related effect with extremely low value capacitor (measuring a few picoFarad's to a few dozens of pF at best). In such a case, a low series resistor should also been added, in order to emulate the slight difference of output from coils wound with different AWG wires...

The Fat Tap trick reacts more like a VariTone wired in series and using one of the coils of an humbucker as an inductor, instead of relying on an external choke + selectable caps in parallel with the pickup(s)...

 

[andyg_prs]

De gustibus et de coloribus non est disputandum.

andyg_prs : sorry to be unable to explain things in a clearer way. Let's just repeat that a cap at split junction can't do the same thing for both coils because of its location : it's on the HOT side of the first coil and acts therefore like a low-pass filter for it. It's on the GROUND side of the 2d coil and would behave like a high-pass filter for it without the 1st coil...

The most important is that 5spice sims and real life experiments show the same thing: splitting through a cap helps to keep a bit of fatness/output from the 1st coil in the bass/mid ranges. Just keep in mind that with a cap at split junction, the mid "dip" between the two resonant peaks is not due only to the value of the capacitor: it depends also on the specs of the pickup itself. That's why experimenting remains the best solution. If you want the mentioned mid dip to be lower in the spectrum or to be too low pitched to be noticeable, just increase the value of the capacitor used...

FWIW. Merry Xmas to you and to all other readers!

There's absolutely nothing to apologize for....I really appreciate all of your time. With your technical knowledge, with you permission, I might PM you about an unusual 'mutli-volume' pedal I want to make......or if you prefer, I could create a post on here somewhere.....

 

[freefrog]

There's absolutely nothing to apologize for....I really appreciate all of your time. With your technical knowledge, with you permission, I might PM you about an unusual 'mutli-volume' pedal I want to make......or if you prefer, I could create a post on here somewhere.....

No problem, Andy. I dont't know if my answer(s) will be useful but I should be able to reply, in this topic or by PM. ;-)

 

[andyg_prs]

You know what, forget order, let's put it in here.....

Today I use a passive volume pedal in the loop of my Engl Ironball and it works great. It's a Classic Audio Effects - Passive Volume Roller G2. In rehearsals I can show ideas with all the gain that I need but at a much lower volume. And live I leave the volume roughly halfway, and I can tweak the volume where needed.

However, I mostly leave it alone as I find it too difficult to reliably change the volume.

So, in this first example, the idea is to be able to somehow have the switching set up so that only the volume pot associated with the footswitch used is in circuit. Perhaps some kind of relay system. But as you can see, too many footswitches that would need to be spaced far enough across to be usable with my size 12s.

So here we've got a switch that rocks in either direction for up/down, the image stolen from a Boss FS-7. Same concept, but far less crowded.



But I can't find anyone who can advise how to make it - the ability to switch to independent pots.

Other suggestions have included:

• Arduino or another microcontroller....but I simply don't have the skills
• A motorised pot....but again, you need a way to control the pot notching up and down....
• And most recently I've wondered about old fashioned radios where you could save channels and a push button memory switch would slide to a different position on the 'coil tuner'....and if a similar thing could be done except the movement would be along the length of a rehostat (although that's probably the wrong device) or some linear potentiometer.....I think this last one if probably a bit wacky!

Thanks,
Andy​

 

[freefrog]

It's certainly doable but...

*Arduino microcontrollers, motorized pots and/or relays are all potential sources of failures to me - and uselessly complicated for such a simple task IMHO.
*For decades, I play on stage with volume pedals that I set by ear... As long as they can remain mechanically in place, they are the easiest and most reliable way to control volume in different venues IME.
*If I had to use volume presets, I'd spontaneously consider to use something like a Roland/Boss MFX + 4 cables method and to tweak the "assign" functions to increase / decrease the volume thx to some Ctrl switch... but I would avoid having to press 6 times on a switch to go from min to max or conversely, TBH.
Instead of that, in fact, I'd probably use ONE single passive mean to go back and forth between TWO adjustable volume presets at best (possibly thanks to some mechanical way to limit the min to max / heel and toes positions of the simplest possible volume pedal).

Now, do what you want and be happy. See ya!