hard wire true bypass?? help

scstowaway · January 28, 2015, 08:53:33 PM

So I'm building a guitar, putting an effect pedal in the body, the pedal has true bypass. since I'm already crammed for space, id like to get rid of the jacks (1/4) and just hardwire the in/out. not sure how to go about this since the jacks have three solder points, and my leads will only be pairs. any help is appreciated

PBE6 · January 28, 2015, 09:32:27 PM

If you get rid of the bypass, the effect will be on all the time. Is that what you want? Or do you want to change the stompswitch to a smaller switch?

vigilante397 · January 28, 2015, 09:58:40 PM

Both negative leads from the jacks go to ground, positive lead of the input connects to the positive lead of the guitar, and the output jack is the final output.

scstowaway · January 28, 2015, 10:13:55 PM

I'm keeping the switch, basically i just want to get rid of the 1/4" in/out jacks on the pedal and solder the wires coming from 3 way switch directly to the circuit board, same goes for the wires coming from output jack on guitar. I just know that when using the pedal, if nothings plugged into the input, nothings happening. wasn't sure how to mimic this without the little contraption in the jacks.

Oh and it is a 3pdt switch, so i can have an led.

Also, not sure if this makes a difference, the pedal had stereo outs option, mono when only ones in use, I'm getting rid of the second(stereo R) all together. I'm fine with mono.

scstowaway · January 28, 2015, 10:27:14 PM

so would i have to put a jumper between the negative and mystery third posts on the circuit board or anything?

vigilante397 · January 28, 2015, 10:28:23 PM

Quote from: scstowaway on January 28, 2015, 10:27:14 PM
so would i have to put a jumper between the negative and mystery third posts on the circuit board or anything?

Mystery third post? I have no idea what you mean, but I think pictures would help more than anything.

PBE6 · January 29, 2015, 12:20:16 AM

Pedals usually get powered up when a mono plug is inserted into a stereo input jack. This happens because the negative terminal on the battery is connected to the ring of the input jack, and the circuit ground is connected to the sleeve. When a mono cable is inserted into the jack, a connection between battery and ground is made and current can flow. In order to replicate this in your guitar, you'll need a stereo input jack.

The new input to the stompswitch will be the output of your volume knob. The circuit input/output and true bypass connections remain unchanged. The output of the stompswitch gets connected to the tip of the input jack. The negative terminal on the battery gets connected to the ring of the input jack. The circuit ground gets connected to the sleeve of the input jack, along with the ground from the pickup circuitry.

scstowaway · January 29, 2015, 02:17:51 AM

PBE6, Im a little confused about the input of the pedal being connected to the volume control. I just picture the signal flow as if it were a pedal on the floor, signal from guitar output goes into pedal, and if I'm not mistaken, i thought my guitars output jack was connected to the toggle switch..? my plan was just to wire the guitar as normal, but instead of soldering my output wires to the output jack, id wire them to the input of the pedal, then out the pedal to the jack. illegal a pic up first thing in the morn, maybe that'll help

PBE6 · January 29, 2015, 11:14:57 AM

Yes, whatever is connected to the tip of the guitar's output jack right now gets connected to the tip of the pedal's input jack. It's usually the volume out, but not necessarily.

The wire attached to the tip of the pedal's output jack connects to the tip of the guitar's output jack. The negative battery terminal connects to the ring of the guitar's output jack. The pedal ground and guitar ground connect to the sleeve of the guitar's output jack.

scstowaway · February 06, 2015, 09:16:35 PM

pbe6, thank you very much! ok, so at first your last suggestion threw me for a loop, but after tinkering around tall started to make sense. i followed your steps, and it got me close. true bypass is working, powers off when guitar is unplugged. but when pedal is engaged, theres very little effect if any, pretty much only heard when a sustained note turns to feedback. my guitar has 2 hums, 2 vol. and a 3 way toggle. so hot from toggle and ground go to pedal input, along with ring from guitars stereo input jack to battery neg, then hot from pedal to guitar jack tip, and ground from pedal to guitar jack sleeve. any ideas?? The only thing i could think of that might cause any issue would be the battery negative from jack to input, seeing as thats the only thing connected to the guitar jack that hasn't run through the pedal... not sure if I'm making any sense

PBE6 · February 07, 2015, 01:30:03 AM

This is what I meant, does your wiring match up with this?

Sorry about the hand drawing..I've also left out the LED, but according to your post that should be fine.

Double check to make sure the ground connections on your guitar and your effect are all connected, and preferably directly connected to the same spot (either the back of a pot or right on the guitar output sleeve).

Which effect are you connecting?

Jdansti · February 07, 2015, 02:01:44 AM

Looks like you guys have this licked. I'll throw in my drawing that I've used on a couple of guitars.

Edit-Cleaned up drawing.

Edit: BTW-you might want to think about using a DPDT push-pull pot/switch in place of a 3PDT switch. It's cleaner and you'll know if the effect is on or off by looking at whether the knob is in or out. SmallBear.com has a lot of values. One should match your current pot value.

scstowaway · February 07, 2015, 04:06:19 AM

oh man,you guys are far more advanced than myself with this stuff.i don't know whats going on in the switch (3pdt). on the circuit board, i removed the 1/4 jacks, they were each connected by 3 solder points. on the input, I've identified the tip, sleeve and battery neg. not sure what the 3rd solder point on the output does (i identified the hot and ground). I've included some crappy pics and awful illustrations for you to laugh at the pics are after removing the two out jacks of the pedal, input still there(but gone now) oh, and its a delay pedal, delta labs dd1, craigslist, $20. This is my third guitar build, just wanted to add a little flavor . /woodwork/guitars/delaychip.jpg
/woodwork/guitars/delaychip3.jpg
/woodwork/guitars/delaychip4.jpg

and one of the front just for kicks
/woodwork/guitars/mytele2.jpg

scstowaway · February 07, 2015, 04:17:50 AM

Quote from: scstowaway on February 07, 2015, 04:06:19 AM
oh man,you guys are far more advanced than myself with this stuff.i don't know whats going on in the switch (3pdt). on the circuit board, i removed the 1/4 jacks, they were each connected by 3 solder points. on the input, I've identified the tip, sleeve and battery neg. not sure what the 3rd solder point on the output does (i identified the hot and ground). I've included some crappy pics and awful illustrations for you to laugh at the pics are after removing the two out jacks of the pedal, input still there(but gone now) oh, and its a delay pedal, delta labs dd1, craigslist, $20. This is my third guitar build, just wanted to add a little flavor . /woodwork/guitars/delaychip.jpg
/woodwork/guitars/delaychip3.jpg
/woodwork/guitars/delaychip4.jpg

and one of the front just for kicks
/woodwork/guitars/mytele2.jpg

soooo, doesn't look like my pics are working....

bluebunny · February 07, 2015, 09:30:00 AM

Quote from: scstowaway on February 07, 2015, 04:17:50 AM
soooo, doesn't look like my pics are working....

You need a complete URL for your picture(s). Then put this URL in between [img] and [/img] tags (use the

button).

scstowaway · February 07, 2015, 12:55:04 PM

scstowaway · February 07, 2015, 02:16:16 PM

also, not sure if its of any significance, but when i unplug the battery while the effect is engaged, it kills the signal completely. but when i hit the switch (turning the effect off) while battery is still disconnected, the signal comes back. Just didn't know if that was a sign of a bad switch. thats another thing, I'm beginning to wonder if may have messed up the electronics in the midst of all this tinkering

vigilante397 · February 07, 2015, 02:18:49 PM

Quote from: scstowaway on February 07, 2015, 02:16:16 PM
also, not sure if its of any significance, but when i unplug the battery while the effect is engaged, it kills the signal completely. but when i hit the switch (turning the effect off) while battery is still disconnected, the signal comes back. Just didn't know if that was a sign of a bad switch. thats another thing, I'm beginning to wonder if may have messed up the electronics in the midst of all this tinkering

That's how effects work. If the effect is engaged and you cut the power, you get no signal. But as long as it's true bypass you can still get clean signal through it when it's unplugged.

Jdansti · February 07, 2015, 04:52:07 PM

Now I see what you're trying to do.

What happens when you hold a temporary jumper wire across the input jack sleeve and ring PCB pads? Does the circuit turn on when you connect it and off when you disconnect it? If it does, then this should work:

The mystery pad on the output could be an unused ring connection or a blind terminal to mechanically support the jack. I guess it could also tell the board that you are in mono mode if the jack is a TRS. If this is the case, try a jumper between the mystery pad and ground. If this works, permanently ground it.

scstowaway · February 07, 2015, 05:30:33 PM

i got it!! details to come...

News:

hard wire true bypass?? help