3 Mini Humbuckers, 3 Mini Toggles, 3 Volumes

bhr

New member
Hello,

Attached to this post is a wiring diagram that shows how I expect to wire 3 mini humbuckers into a Squier Vintage Modified Stratocaster. The diagram uses a separate mini toggle switch for each pickup to turn them on or off, a separate volume control for each pickup, and no tone controls. The pickups are wired in series (at least that's what I intended). I am hoping that someone can either validate this diagram or point out where it is incorrect, or why it won't work.

I have played around with wiring in parallel and coil splitting, and I don't care for those sounds. I found I'm one of those people who will use a single coil pickup if I want that type of sound. I also don't care for the sound out of phase pickups.

I strongly dislike blade switches for reasons that are at least partly unwarranted, so I won't use something like a 5-way blade switch. I like 3-way toggle switches, but like the 5-way switches their capabilities don't account for all pickup possibilities in a 3-pickup configuration, and I don't like the possible options for getting around those limitations. I am no longer play gigs and am not concerned about the effort to flip 3 separate switches to select pickups. I rarely change pickup selections during a song, and that was true even in my live performing days.

The reason for using 3 volume controls is to balance the output of the pickups. I have read a number of posts where people state that certain combinations of pickups in a 3-pickup configuration don't sound good, but in all those cases people are using only 1 or 2 volume controls. Perhaps balancing the pickups using 3 volume controls won't work, but I'm interested in trying it, and if it doesn't work I'll switch to something else.

The diagram doesn't have a tone control because I've always found them to make the sound muddy, so in any guitars I've had that have had tone controls I have always kept them all of the way up adjust the tone in my amp. These days I use amp simulation software that includes 7 band equalizers, and that gives me great control over the tone.

I am concerned about the potential loss of volume using this configuration. My understanding of electrical wiring, resistance, etc... is very limited. I don't understand how the combination of switches and potentiometers causes signal degradation, but I've seen other posts discussing something like this, so it is something that needs to be taken into consideration in any wiring configuration.

Other than creating a new pickguard for the Squire, the only modification I'll need to make to the guitar it is to slightly enlarge the neck pickup cavity. It is currently routed for HSS even though the original pickguard contained 3 single coil pickups.

Thank you in advance for your help.
 

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Re: 3 Mini Humbuckers, 3 Mini Toggles, 3 Volumes

Better to have the volumes before the switches IMO. If the wiring is indeed series, then any tweak of individual volume will affect all, as all pickups pass through every pot.

For mine, look up the Brian May wiring for the switch wiring......ignoring the phase switches of course (although phase reversal and series is a cool tone in its own right).
 
Re: 3 Mini Humbuckers, 3 Mini Toggles, 3 Volumes

3 volume controls doesn't seem very user friendly / ergonomic. I personally stuggle if there is more than one volume control. Could you rationalise the design so the neck and middle pickups can share a volume control?

There is no issue with signal degradation, but 3 volume controls placed after the switches will create a low impedace load and reduce brightness. That is similar to adding an unused tone control. Placing the volume controls before the switches would avoid that problem.

Have you considered the triple SM-3 pickguard from Siegler?
 
3 Mini Humbuckers, 3 Mini Toggles, 3 Volumes

I’m thinking that we need to clarify how you’re using the term “series.”

If you’re referring to each pickup being in series (Black=hot, red&white connected, green&bare=ground) then the diagram is correct.

If you’re referring to the pickups being in series WITH ONE ANOTHER then the diagram is incorrect (they’re in parallel with one another).

I’m guessing that you were referring to each pickup being in series rather than the relationships between the pickups themselves, as the latter is pretty uncommon, especially with humbuckers. So, making that assumption...

As it sits, the volume controls will operate a little like on a Les Paul, but on a LP the switch takes both the pickup and the volume control into or out of the circuit. The way this is set up right now, any one of the volume controls, if turned all the way down, will render the entire guitar to be silent... REGARDLESS of whether the switch is on or off. Reversing the electrical positions of the switches and the pots (jack > switch > pot > pickup > ground) will allow the switches to pull any “off” pickup’s volume control out of the circuit leaving it like a Les Paul but with three pickups instead of two. The nice thing about this is that turning your guitar “off” is simply done by rolling down one volume control, as long as that volume’s switch is on.

You could also make the volume controls completely independent of one another so each one also acts like your switch... giving you the option of turning a pickup on or off with the volume control as well as the switch. The only downside is losing the ability to turn the guitar off with one volume control. If you want to make them independent, just reverse the two non-grounded lugs of the volume controls, like this:

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Also, since you mentioned not liking 5-way switches because they don’t allow for every combination, another completely different option would be to use two 3-way toggles. One would work on the bridge and the neck like a Les Paul, and the other would work on the center pickup (off, on with bridge and/or neck, on by itself). This would give you all the available combinations as well and you could do it with just a master volume and only use the three existing holes in your pickguard.
 
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Re: 3 Mini Humbuckers, 3 Mini Toggles, 3 Volumes

Thank you for all of the good information. You not only answered my questions, you answered questions I didn't know to ask.

Attached is a revised diagram. As suggested, the sequence of the volume controls and switches have been reversed, and the volume in and output connections have been reversed. I had thought about the sequence of the volume controls and switches, but hadn't known what effect the sequence would have. I had also read about how it is possible to wire a guitar so that when one volume controlled is turned off it turns off all pickups, and that is not what I wanted, I want them to act independently.

In the diagram I have a ground going to the upper lug of the switches, which is the "off" position. Is this necessary, and if not, could I use an on-off SPST switch instead of an on-on SPDT switch?

AlexR, I have previously looked at the wiring of the Brian Mays guitar. I wasn't sure how the wiring of single coil pickups might be different than humbuckers, and since he only uses 1 volume control it didn't seem very applicable to what I am attempting to do with this configuration.

Teleplayer, what I am attempting to do with this configuration is to use individual volume controls to balance the sound. I suspect the amount of volume from the middle pickup will need to be reduced with some pickup combinations to improve the clarity of sound. I can't test that theory if I have a volume that is shared by the middle pickup and either of the other pickups. The Sigler SM-3 pickguard is what peaked my interest in the 3 mini humbucker configuration. I heard a YouTube demo of their custom Stratocaster using 3 Seymour Duncan SM-3 pickups and I really liked the sound. It even quacked! Their pickguard isn't configured the way I want, but they might configure it the way I want if I requested it. But part of the reason I am doing this is for the learning experience, and another part is for the enjoyment and satisfaction in doing it myself, including creating a pickguard from maple. That's stuff I wouldn't have even dreamed of attempting 30 years ago.

BriGuy1968, I have read that humbuckers are normally wired in series, and single coil pickups are normally wired in parallel. I thought that was referring to the wiring of the coils, but that could be another example of my lack of understanding of wiring. What I thought I was doing was to wire the pickups the way humbuckers are normally wired, with the exception of the number of volume controls and switches. Does the diagram show this, or have I done something different?

Thanks again.
 

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Re: 3 Mini Humbuckers, 3 Mini Toggles, 3 Volumes

Your new diagram will do what you had asked... nicely drawn by the way! [emoji41][emoji1303]
 
Re: 3 Mini Humbuckers, 3 Mini Toggles, 3 Volumes

Teleplayer, what I am attempting to do with this configuration is to use individual volume controls to balance the sound. I suspect the amount of volume from the middle pickup will need to be reduced with some pickup combinations to improve the clarity of sound. I can't test that theory if I have a volume that is shared by the middle pickup and either of the other pickups. The Sigler SM-3 pickguard is what peaked my interest in the 3 mini humbucker configuration. I heard a YouTube demo of their custom Stratocaster using 3 Seymour Duncan SM-3 pickups and I really liked the sound. It even quacked! Their pickguard isn't configured the way I want, but they might configure it the way I want if I requested it. But part of the reason I am doing this is for the learning experience, and another part is for the enjoyment and satisfaction in doing it myself, including creating a pickguard from maple. That's stuff I wouldn't have even dreamed of attempting 30 years ago.

I like your approach of experimentation. That's a fine reason for doing what you explained. I also found the Sigler SM-3 strat youtube demo to be very interesting and an attractive concept. For sure the Neck and Bridge tones came across really well in the demo. It really depends the tone you want, but to me the position 2 and 4 tones didn't seem to be very distinct. The middle pickup by itself sounds super-bluesy, but it didn't seem to add much variety to the tone compared to the neck pickup was quite similar and possibly more cutting. If I were to assemble a new pickguard with Neck and Bridge SM-3s, I'd be inclined to try a different pickup in the middle position. Possibly a SM-1 in the middle position would provide a brighter tone, but in preference to that I would like to include a strat pickup in the middle position. I prefer to avoid middle pickups that are too dull or place to much emphasis on midrange frequencies. I would either use a noise cancelling strat pickup such as a Dimarzio Area 58 or a Duncan Cool rails, or if going with true single coils, possibly a SSL-2 Seymour Duncan. I'm not sure if we are talking about the same issue or not. I just want to express my own perspective on the concept.
 
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