- May 21, 2011
- Reaction score
Lester,Starting on the theory side...
I thought I understood how a humbucker worked... two coils, one reverse would, back to back. Hum generated by both coils with opposite hum/sine waves, sine waves cancel each other (always wondered why this didn't cause the canceling of other frequencies that I want, like the notes I play, but that's a side question/tangent).
I also know that you can have the same arrangement with two single coils and one RWRP forming an extended humbucker on a two-pickup, single coils guitar.
My issue: I thought that in either case the magnetic coils needed to be in physical alignment for it to work. Same plane, rough physical proximity, just one coil RWRP. But, as I've started to look into using a dummy coil (no magnets or core), I've seen them stuffed in all sort of locations with little concern about physical placement/alignment.
So, first question: Does the humbucking effect work simply by having the RWRP in the circuit? Would it work the same (as an example) if I stuck the dummy coil in a non-metal box with a couple jacks and plugged into the box from the guitar and then went to the amp?
Second question: Let's assume you have a humbucker or two single coils (one RWRP) already doing humbucking. You put a dummy coil in the line. Does the dummy now re-generate hum that your humbuckers filtered out?
I haven't replied immediately to your questions 'cause I wanted to do a funny il' test for ya. Not that I've too much free time but it took me only five minutes this evening....
Below is the trace of a recording involving my Hamer with P90's, through a Tube Screamer feeding a tube distortion. Each pedal had its gain knob @ noon and the amp was set clean.
The first part translates the noise produced by the P90 neck alone in this case.
The second part is with the dummy coil enabled.
The third part is with the dummy coil flipped upside down in the guitar (I had to put the recording on "pause" and to pull off three screws for that).
The fourth part shows what happens when the dummy coil is oriented in the right direction but located outside the guitar.
The fifth part is with the dummy coil perpendicular to the guitar.
The last part shows what happens when the dummy coil is "angled" (IOW: not parallel nor perpendicular) outside the guitar.
I've put back the dummy coil in its initial place. But I hope this experiment to reply to your first question...
And yes, the reply to your Q2 is yes.