I think this may be an easy fix

[Yalesmith]

Howdy…. I am pretty sure this is a dumb question, especially for some who has built 40 or so pedals but this is the first time I built a dual footswitch pedal.

I just finished building the AT+ and it works fine and sounds great! The only issue is that the bypass does not work, meaning the pedal has no sound until the boost is engaged. Any ideas what this might be?

On a side note, the AT circuit is an underrated design, can do modern hi gain as well classic rock and everything in between. I wonder what it’s based on?

 

[Robert]

Does the drive side work on it's own when the boost is off?

 

[spi]

AT circuit is an underrated design

This circuit (and very similarly tweaked versions) is in pedals that came before it, and that came after. It's been around in various forms for a while. Meaning to say it's very popular and probably not underrated.

 

[spi]

Are you saying that even if you turn the boost off, you still have to use the boost volume to get signal? Or are you saying with the boost off you get no signal at all?

 

[Yalesmith]

I am saying no volume with boost off…. Boost needs to be engaged to get any sound. Once the boost is engaged then the pedal acts as normal. It’s like when the boost is off, the dry signal goes to ground. Hopefully that makes sense.

Thanks!

 

[Yalesmith]

Does the drive side work on it's own when the boost is off?

It does not

 

[Robert]

It does not

That'll be a problem around the boost footswitch... either the footswitch itself, a bad solder connection or solder bridge, or a damaged trace on the breakout board.

 

[jimilee]

It does not

Wait, what’s the point if the boost if you can’t turn it off?

 

[synthesiserror]

Does the drive knob work?

 

[spi]

Wait, what’s the point if the boost if you can’t turn it off?

What's the point of turning a boost off?

 

[Feral Feline]

I agree with Spi, the AT+ is underrated because there are so many great circuits it was derived from.



Did you test the drive side and boost side separately at any time before adding the footswitches?

 

[jimilee]

What's the point of turning a boost off?

Touché

 

[Robert]

What's the point of turning a boost off?

So you can turn it on. Otherwise it's not a boost, it's just a really loud pedal.

 

[Yalesmith]

Does the drive knob work?

The drive know works

 

[Yalesmith]

I agree with Spi, the AT+ is underrated because there are so many great circuits it was derived from.



Did you test the drive side and boost side separately at any time before adding the footswitches?

I did not

 

[Yalesmith]

That'll be a problem around the boost footswitch... either the footswitch itself, a bad solder connection or solder bridge, or a damaged trace on the breakout board.

I did switch out the footswitch but not the breakout board…. I should just go ahead and do that, the board was acting a bit weird with the light switch. Now that I say it out loud it seems redicolus I did not swap it out. Thanks!!

 

[hamerfan]

It's an OCD derivate, if I remember right.

 

[Robert]

It's an OCD derivate, if I remember right.

Drive side is a Crunch Box, Boost side is a Tube Screamer with fixed gain and tone.

 

[hamerfan]

Drive side is a Crunch Box, Boost side is a Tube Screamer with fixed gain and tone.

Yes, that's right. I stand corrected.

 

[Yalesmith]

Gentlemen,

Appears the breakout board was damaged (by me). I think it may of been soldered at an angle and when I attached to the board, then screwed it to the box something happened. I confirmed the link break…. The funny think about this, is that this was the obvious potentian cause but when ever I have an issues it is never that easy!! Lesson for me is to start with the obvious and work from there.

Thanks again guys!!