Introduction: Build a Killswitch Into Your Guitar

Picture of Build a Killswitch Into Your Guitar

People seem to love killswitches, just look at Buckethead and Tom Morello, and a lot of people want to put them into their guitars. I have nothing against this, all the more power to you. The problem I see is with solutions that still produce an audible hum when the killswitch is engaged. This is because a lot of solutions short-circuit the guitar or cable, rather than actually killing the signal-path.

You see, no matter how much you payed for your guitar cables, there will still be some level of hum produced by your rig, especially with an extensive pedal-board, or with distortion effects like fuzz-boxes so long as the circuit that is your rig is closed. In this instructable, I will show you how to add a noise-free killswitch to any guitar with a 1/4 inch output jack.

Step 1: Parts

Picture of Parts

You will need:

-- A guitar, obviously.
-- A pushbutton normally closed momentary switch. It is very, very, important that the switch be normally closed, check the package carefully before you buy your switch.
-- A soldering iron.
-- Solder.
-- Heat-shrink tubing (or electrical tape in a pinch) to make everything all nice and pretty, and to prevent accidental short-circuits.
-- Screwdrivers that can open up your guitar.
-- Wire cutters and wire strippers.
-- A drill with an appropriately-sized bit. Check the packaging for your switch to see if a mounting-hole diameter is listed, since this will help a lot. If you can't find a listed size, err towards a smaller hole, since you can make holes bigger, but not smaller.
-- You may also need a bit of extra wire if there isn't enough slack, a foot of stranded 20 AWG copper wire should be more than enough.

Step 2: Prep-work

Picture of Prep-work

Before you can install your killswitch, you are going to have to get at the guts of your guitar, specifically you will need to get at the wires that go to your guitar's output jack. Find the wire that connects to the sleeve of the plug, in most guitars this wire will be black. Trace this wire back to the guitar's volume pot (or wherever the wires finally come together to become a single pair), but don't cut the wire yet.

Now you're going to have to figure out where you want to put the switch. Unless you're willing to do a lot of extra work, you'll be limited in placement options by where the guitar's control-cavity is. Once you've determined where you want to place the switch, carefully mark the position and then drill a mounting-hole for the switch. If you're drilling through the body of your guitar, drill very carefully through the front of the guitar so that if there is any accidental splintering, it will be out of sight. To minimize the risk of splintering, you should press very gently while running the drill at a high speed.

Step 3: Installation

Now comes the time to cut that wire that you traced back at the beginning of the previous step. Before cutting the wire, make sure that there is enough of the wire to go from the volume pot (or wherever) to the switch and then to the output jack; if there isn't enough wire for this, you'll have to splice some in. Whichever way it turns out, wire in the switch; if your switch needs to be installed in the guitar before connecting the wires, do so now and save yourself some time and effort. Also make sure, if you're using heat-shrink tubing, that it is in place before soldering your wires.

Make sure to insulate all your connections, and test them somehow before you close everything up, especially if you had to de-string your guitar in order to install the switch. The best way I have found to test your wiring is to plug your guitar into an amp, turn on the amp, and then stick some ferric object (like your screwdriver) onto your selected pickup, or if you did not have to remove your guitar's strings, pluck a string; if you don't get any sound make sure first that the volume is up on both the guitar and amp, and then that your selector-switch (if applicable) is set to the proper pickup. If you get sound, then you're golden, otherwise go back and check all your connections.

Step 4: Finishing

Picture of Finishing

When you're as sure as you can be that everything is in working order, put everything back together and rock out.

Comments

GuitarX15 made it! (author)2015-05-12

I just installed this new killswitch I found into my strat.

It's made from aluminum with a built in LED,

I got it here at Iron Age Guitar Accessories

It
was a bit different to wire up since it's a normally open switch but it
looks and feels amazing! I've had it for a couple of months now and
there are no issues with noise or pops, it seems to be built really well
& the pushbutton action is crisp :)

LucDaRocka1 (author)2012-08-02

volkswagon guitar? sweet! i want one for i play guitar and love volkswagons!

wobbler (author)2011-05-31

I've started using these switches instead of the type shown.
http://www.maplin.co.uk/large-push-to-make-2495

Although they are called "large", they are not much bigger than the one above but they seem to be a lot sturdier and they have a much smoother action, without that sticking that I find the above switches often have. I think they only do them in push to make though so they will only work in the "short to earth" type kill switches..

ranger_steve (author)2008-09-03

yout dont even need a kilswitch cuz u can turn the volume down all the way on one of the pickups, the flick the selector switch a bunch like tom morello

Glockenator (author)ranger_steve2010-10-24

That can break your switch and most guitars don't have separate volumes

ranger_steve (author)Glockenator2010-10-24

yea i know that now, the pickup selector on my les paul i quite finicky now because i used to use it quite a bit as a kill switch. and almost every guitar that has 2 different pickups (ex. les paul's, sg's etc...) have 2 seperate volume knobs.

M_Guyver (author)2010-01-24

I never use those tiny cheap switches, they crap out too easily.

The first guitar I put a kill switch on was wired this way... never again.  Every time you'd push-n-release the button you'd hear "POP" "POP" "POP" "POP", like when you unplug the patch cable with the amp still on.

The best way is a Normally Open switch wired across the jack connections. It works as if you turn your guitar's volume knob instantly to zero.

TwilightShadow505 (author)2009-05-24

what guitar is that?

It's a repainted First Act Garagemaster that was signed by the band Illinois.

birdmankustomz (author)2008-08-14

Thats funny I just found 12 of those exact buttons on an old switchboard in my attic.

tehpwnz0r (author)birdmankustomz2008-11-17

mail me three?

a7x1st (author)2008-08-24

normally closed? i thought it is normally open, if closed then to sound the guitar we must push the button

TheMadScientist (author)a7x1st2008-10-15

no, because this one works opposite of the way other killswitches do, instead of shorting it to ground, it breaks the circuit entirely.

DeanAdam (author)2008-04-11

Thanks, TheMadTinker and pandaman0529 for your Instructables.

There are two basic approaches to creating a kill switch: the closed-circuit or bypass method used by pandaman0529, and the open circuit method used by TheMadTinker. There are diagrams here that show the difference, for anyone who still thinks they're the same - http://alexplorer.net/guitar/mods/killswitch.html

Peace.

TheMadTinker (author)DeanAdam2008-04-11

Thank you for being an unbiased voice of reason. The internet needs more of those.

bustedit (author)TheMadTinker2008-08-08

have i seen your name on circuit bends (outside of this site)?

TheMadTinker (author)bustedit2008-08-09

If you have, it wasn't me; I haven't posted any of my other electronic work on the interblag.

bustedit (author)TheMadTinker2008-08-09

my bad as they say, it was the mad tinkerERER

eyesonly (author)2008-06-30

How can I be positive and constructive about your guide? I have an Engineering Technologist Degree in Electronics and I had no idea what you were talking about. I think you could improve your guide if you made it clear what you did, and had some useful pictures rather than what you actually have now. DeanAdam's link instantly conveyed what was happening with two pictures. As near as I can tell what you are doing is effectively unplugging the guitar cable by using an open switch,. thus leaving the input to the amplifier floating. I can't imagine that being a very good solution. With a Gibson wiring when you toggle the pickup switch from rhythm to treble you get the on/off effect if one volume is turned down and one is up. When you turn down one volume you are grounding the output of the guitar and thus no signal goes into the amplifier input. The correct way to wire a kill switch is going to be to ground the output, not to leave it floating as you have done. SO yes you have done it differently to Pandaman, but you have also done it incorrectly.

Legosandrubberbands (author)2008-06-20

Nice guitar (mouth waters) I'm going to do this once I can buy a normal-on switch at a hobby shop or something :) hooray!

itsachen (author)2008-04-02

this is exactly the same as my instructable...just with fewer pictures
and my instructable kills the signal...there is no "audible hum" when the switch is pressed, its as if you turned your vol pot. all the way down, or unplugged ur guitar from the amp.

the most confusing part is that you said "a lot of solutions short-circuit the guitar or cable, rather than actually killing the signal-path." when number 1- you basically did what i did and number 2 - you short circuted (or allowed a current to flow along a different path from the one intended.) the signal.

seriously, theres nothing different. congradulations

TheMadTinker (author)itsachen2008-04-02

If you are using an n.o. switch as a killswitch you must necessarily short the circuit; you're creating a new path of least resistance, which is what happens when a circuit "shorts." If there is still juice flowing through the lines, you're going to get a hum if you have something like, say, a Big Muff Pi plugged in and turned on, this is really really noticeable at even a moderate volume, and is compounded by the 60hz hum from a single-coil pickup. Yes you are killing the signal from your pickups, but you're not interrupting the signal-path. With an n.c. switch, pushing the switch does interrupt the signal-path, if there is a gap opened in the path, which is what an n.c. switch does when engaged, there is no place for the signal to go, no alternate path unless you propose that the signal can flow back the way it came, which is simply preposterous. Also, the way that you present your instructable you say clearly that you can only put your killswitch on strat-style guitars, while the method I have presented here can be used on any electric, or even electric-acoustic, guitar, not just guitars with strat-style wiring.

DjProToJeeX (author)TheMadTinker2008-04-23

i get a hum on my laptop to my mixer when the charger is plugged in. I unplug it its gone. wonder what it could be :).

itsachen (author)TheMadTinker2008-04-03

If you read my instructable then you can see I use a n.o. switch. (NOWHERE DO I SAY N.C Also I don't know if your realize that I did not tap the signal from the pickups directly, I tapped the final signal coming out of the vol. pot.

You also say "Yes you are killing the signal from your pickups, but you're not interrupting the signal-path."

I don't know if you read my instructable, but when the switch is pressed, the signal is rerouted to ground. So technically...I interrupt the signal path...eh?

If you put an on off switch, and literally kill the signal, the buzz you mention is going to occur. This link explains too.

TheMadTinker (author)itsachen2008-04-03

Really, I don't honestly give two shakes of a lamb's tail about all this, I do things one way, you do things another way, end of story. I'm simply presenting an alternative method to making a killswitch that can be applied to any electric guitar for those who don't have a strat-style guitar. I'm aware that there are other places on the internet where this information can be obtained, but a lot of people come here for their information on DIY solutions. If you feel the need to reply to this, don't.

I'm sorry but if you have a drill you can do this in any guitar its not a just a strat thing or a your way of doing things way I could do it pandaman's way with my SG if I wanted to. I've read both of your Instructables and pandaman did it the same way as you just first. Sorry if this is harsh but you way is not different than any one else's.

itsachen (author)TheMadTinker2008-04-03

You sir, win an internet.

DjProToJeeX (author)2008-04-23

"there will still be some level of hum produced by your rig" i dont totally agree with that, but in a sense yes. there will always be the minimal level, but cables and stuff do help in the matter. A+ guide tho. added to my group and rated

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