what is this knob?

[Elfunkenstein]

please tell me what this knob in this guitar is and how I can make or buy it: http://www.youtube.com/watch?v=BkxXdaIWgro&feature=channel

edit: the one that does the series-parallel switch thing.

 

[Funkfingers]

Re: what is this knob?

I recall an article in either Guitar Player or Guitar World magazine in which Dan Armstrong described and schematically illustrated a similar series/parallel wiring idea for Telecaster in which the original Tone pot acted as the S/P switch.

In the published DA mod circuit, the Tele's second pot no longer acts as a conventional treble roll off control. Notice how, on that YT video, turning the pots does not roll off treble either.

I suspect that the same circuit idea has been employed on the Myka Dragonfly guitar. Unearthing the appropriate magazine issue to report the circuit could takes days. D'oh!

My best suggestion for now is to trawl the 'net for Dan Armstrong Tele Series/Parallel Mod.

 

[ehdwuld]

Re: what is this knob?

doesnt the Washburn Idol series use a VCC system similar to this?

http://www.washburn.com/resources/resources/vcc.html

 

[Funkfingers]

Re: what is this knob?

VCC reminds me of the partial coil-tapping system on the Peavey T-60.

Neither the Washburn nor the Peavey systems offer series/parallel switching.

 

[octavedoctor]

Re: what is this knob?

All you are doing is putting a volume control between the two coils of the humbucker. The Washburn VCC is the same thing.

It's not really a graduated coil tap; the effect is more complex than that as the pot is using one coil in the pair (and a capacitor) to create a circuit with a variable resonance peak as well as an adjusted spectral content .

A couple of options are shown here.

The capacitor is there to stop frequencies consistent with mains cycle hum from draining to earth, thereby maintaining the humbucking function while allowing variable frequency content above these values to be filtered to earth. however the remaining coil acts as a high pass filter and the combination of the two is what changes the overall time constant of the circuit and it's resonant response.

 

[GoldenVulture]

Re: what is this knob?

All you are doing is putting a volume control between the two coils of the humbucker. The Washburn VCC is the same thing.

It's not really a graduated coil tap; the effect is more complex than that as the pot is using one coil in the pair (and a capacitor) to create a circuit with a variable resonance peak as well as an adjusted spectral content .

A couple of options are shown here.

The capacitor is there to stop frequencies consistent with mains cycle hum from draining to earth, thereby maintaining the humbucking function while allowing variable frequency content above these values to be filtered to earth. however the remaining coil acts as a high pass filter and the combination of the two is what changes the overall time constant of the circuit and it's resonant response.

I'm playing around with a "Tapped Pot" and using the Tap connection to the Tap between coils on a Humbucker.I noticed I get hum mainly when turned to the tap point on the pot.[which is predominantly single coil at this point]
I've also wondered how this would work on a tapped single coil.I don't have one to try it on !................:cool2:

PS:

A couple of options are shown here.

??????