Adding a bass cut cap on a push/pull pot?

[Dave Locher]

The volume pot died on my single-pickup partscaster recently and I replaced it with a push/pull because that was what I had. I don't care for the split sound and I am wondering if there is a simple way to add a capacitor inline to cut lows instead?

It is one of these CTS pots.
I figure I will experiment with caps until I find one I like and then solder it in, but I have no idea how to make it work with the pot? I want the cap to engage when the pot is pulled up, so down is regular series humbucker and up is regular series humbucker with the low-cut capacitor engaged.

[AlexR]

Re: Adding a bass cut cap on a push/pull pot?

Look at bass cut wiring diagrams......I think you have to run the hot signal through it for it to work (unlike a treble cut where it is a separate line to ground).

If my memory is accurate, you would have c1 and 2 being the in and out, with the bass cut circuitry between 1 and 3, with 2 and 4 joined as bypass.

[VinceT]

Re: Adding a bass cut cap on a push/pull pot?

I would try:

Signal in on 2

Signal out on C2

Cap bridges from 2 to C2

Basically, the signal is bypassed in up position, except for that portion going through the cap (treble).

In terms of cap values, for the pot based bass contour I’ve been looking at, it’s a 0.0015 uF cap - that might be too much to have as an on-off, so try a few higher values (alligator clip a couple of wires makes testing with various caps easier).



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[Dave Locher]

Re: Adding a bass cut cap on a push/pull pot?

I would try:

Signal in on 2

Signal out on C2

Cap bridges from 2 to C2

Basically, the signal is bypassed in up position, except for that portion going through the cap (treble).

In terms of cap values, for the pot based bass contour I’ve been looking at, it’s a 0.0015 uF cap - that might be too much to have as an on-off, so try a few higher values (alligator clip a couple of wires makes testing with various caps easier).



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So am I understanding you correctly (no guarantees, I'm no tech whiz!):
-Pickup hot to regular pot tab and to 2
-C2 to pot out
-Cap soldered to 2 and C2?

Is that correct?
Normal operation when switch is down, bass cut when knob is pulled up?

[freefrog]

Re: Adding a bass cut cap on a push/pull pot?

What Alex Said.
Below is my take with the pic.



Pickup(s)> C1
C2> right outer lug (while left outer lug goes to ground).
Jumper between 2 & 4.
Cap between 1 & 3.
Center lug to output.

NOTES:
-For bass cut, Rickenbacker mounted 4.7nF caps (0.0047µF).
-IF you mount a tone pot, DON'T wire it AFTER the volume: this tone pot must be BEFORE the "bass cut" (connected to the pickup before it reaches the volume control, IOW).

FWIW.

[ItsaBass]

Re: Adding a bass cut cap on a push/pull pot?

Yes. It is very easy.

You just have the main hot output wire pass through the switch on its way to the jack. Switch down is normal, hot wire to jack. Switch up inserts the cap in line. You can even make it tweakable with the right trim pot added.

I have the opposite in one or two of my Strats. It's a master "Eldred" (cocked wah) switch on the bottom tone pot. When switched on, it dumps high end to ground through a relatively low-valued cap (like .0022 uF, or something like that – I forgot exactly what values I used, but I normally use .0022 or .0033 for Eldred wiring).

[VinceT]

Adding a bass cut cap on a push/pull pot?

What Alex Said.
Below is my take with the pic.

[ATTACH=CONFIG]98870[/ATTACH]

Pickup(s)> C1
C2> right outer lug (while left outer lug goes to ground).
Jumper between 2 & 4.
Cap between 1 & 3.
Center lug to output.

NOTES:
-For bass cut, Rickenbacker mounted 4.7nF caps (0.0047µF).
-IF you mount a tone pot, DON'T wire it AFTER the volume: this tone pot must be BEFORE the "bass cut" (connected to the pickup before it reaches the volume control, IOW).

FWIW.

Go with this one - the diagram makes it clear.


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[Dave Locher]

Re: Adding a bass cut cap on a push/pull pot?

What Alex Said.
Below is my take with the pic.

[ATTACH=CONFIG]98870[/ATTACH]

Pickup(s)> C1
C2> right outer lug (while left outer lug goes to ground).
Jumper between 2 & 4.
Cap between 1 & 3.
Center lug to output.

NOTES:
-For bass cut, Rickenbacker mounted 4.7nF caps (0.0047µF).
-IF you mount a tone pot, DON'T wire it AFTER the volume: this tone pot must be BEFORE the "bass cut" (connected to the pickup before it reaches the volume control, IOW).

FWIW.

Thank you for that! Seeing it makes it all very clear and easy for my puny brain to understand.

[Hclafkir]

Hey all. Following this post I want to wire a push/push pot after this bass cut tone pot in a Mustang. Could I ask for someone’s advice this “schematic”?