Awful Waffle ISSUES

marcokava

New member
Hi everyone and many thanx who can help me.
I've recently bought a AwfulWaffle Kit and after receiving the package, I started assembling it and after 2 hours the PCB was complete with all its components.

I proceed to the "smoke test" - ok
I proceed to the sound test - fail, pressing the foot switch turns on the led but the pedal is in bypass, pressing the foot switch again overoveroveroversaturated sound! The potentiometers do not control anything and have a strange behavior, they seem almost like variable capacitors.

I remove the power supply and carry out a visual inspection:
resistance values and position - ok
capacitor values and position - ok
IC orientation - ok
input and output - ok
bad welds or problems of any kind - nothing to report ..

but then what is it?

Having assembled everything without posing too many problems with what I was doing, I take the wiring diagram and the layout and I look at it ... and here the first doubts arise.
My attention falls on the switch ...
The switch comes with 4 wires: P1 P2 GND SW

418 419

In position A:
SW goes ground with GND (LED lights up)
P1 goes to ground with GND
In position B:
P1 and P2 close (distortion described above)
Looking at the scheme the two positions act as follows.

420

In the empirical tests, I also tried to close P2 to ground together with SW, in this way, the LED lights up and a distortion comes, always very pushed but very muffled ... even here pot have strange behavior.
If P1, P2, SW and GND are open, the pedal is disengaged correctly.

Thank in advance for the support.
Marco.
 
Have you tested the continuity of the wiring from the 3PDT switch to the PCB? Sometimes a cold solder joint on the switch can cause what you are describing.
 
can you include a picture of the wires for the foot switch?
Hi, for testing i've not soldered footswitch. i've simulate footswitch link together red+black+yellow but nothing happens,all pots works like tone if i link together yellow+blue = fail oversaturated
without any control.
thx.
M.
 
perhaps you should put together an audio probe and see where the signal is getting lost in the circuit path. you can do a google search for "DIY audio probe" and find some simple instructions. It is basically an audio cable plugged into your speaker that attached the ground connection to ground on your circuit board, and runs the audio wire through an electrolytic cap to block any DC volts from going to the speaker. you can then put a signal into your powered on pedal and use the probe to follow it through the circuit.
 
Hi again, after reverse pot i've got the same issues above... it's only 21 components to solder where is the problem? damaged kit?
thx
M.
Mine has also an issue. No sound at all. I checked all component before soldering them. I also checked the wires, no problem. I built several more difficult one with no problem so I don't know where it can come from and the only solution is to build an audio probe to understand where it sucks.
 
Mine has also an issue. No sound at all. I checked all component before soldering them. I also checked the wires, no problem. I built several more difficult one with no problem so I don't know where it can come from and the only solution is to build an audio probe to understand where it sucks.
... does anyone build this kit without problems?
thx.
M.
 
Yep those pots need to be inverted.
After some checks (i've noticed of that, but i want to be sure) the orientation don't affect the circuit.
Only effect is the rotation of axis...
452
Anyway... it doesn't work...and now the PCB has been soldered/de-soldered to mani times...i'll retry with another kit :(
Thanx all, i'll let you know with new kit.
M.
 
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