Waddle Box Issue

[DPM309]

Just completed a Waddle Box build using the PedalBCP board. Got it working right away but am having issues with the controls. If I turn up the sensitivity control up, the signal gets really muddy/bassey. This happens from about 9 o'clock up to all the way and doesn't matter where the Range control is set. Took it apart and double and triple checked all connections, component values, etc. I am getting the right sound on this but the sensitivity control does not seem right.
Here are my voltages on the ICs:

IC1 P1 4.63, P2 4.62, P3 4.53, P4 0, P5 4.53, P6 4.63, P7 4.66, P8 9.3

IC2 P1 1.1, P2 4.62, P3 4.64, P4 4.64, P5 5.71, P6 0, P7 5.70, P8, 4.65, P9 4.62, P10 5.62, P11 9.3, P12 5.67, P13 4.63, P14 4.64, P15 1.1, P16 1.1

Any ideas?

 

[Chuck D. Bones]

Try them one at a time, do the cap first.

 

[DPM309]

OK, I think I have it where I want it. I replaced C2 with a .0039uF (3.9) cap and am now getting a lot better response with the Sensitivity control.

 

[music6000]

Cool!
You realize that you may have just started a new craze with this fickle Circuit.

 

[DPM309]

Been playing through it for awhile and it is working great! I would recommend that anyone else that has this or is thinking of building one to use a .0039uF cap in C2. This was the only mod I did and am very happy with results.
Thanks for all the suggestions and tips.

 

[DPM309]

Can mark this SOLVED!

 

[mmm]

Hello, I need some help, please.

I have the Waddle Box. No sound is coming out. Validated connector wiring for Tip & sleeve. Read through DPM309 issues.

Components are per bom. Triple checked. Pic attached. With the change of C2 to 4.7nf. Headed towards a final change to 3.9nf. Solder the crud out of it looking for cold solder joints. Yes, pots backwards - I see now. But that should not make a difference???

Here are voltages. I am concerned IC 2 pin 2 & 15 diode bias at 0v. Is Vref too low to trigger a value?

	IC1	IC2
P1	4.1​	1.1​
P2	4.1​	0​
P3	3.9​	4.11​
P4	0​	4.11​
P5	4​	5.2​
P6	4.11​	0​
P7	4.11​	5.2​
P8	8.23​	1.11​
P9		4​
P10		5.27​
P11		8.24​
P12		5.27​
P13		4.11​
P14		4.12​
P15		0​
P16		1.1​
Battery	~8.2v or less did swap but no real change

 

[mmm]

Validated incorrectly wired connection for Tip & sleeve.
I will reply with update soon.

 

[mmm]

By pass sound now works correctly. But the circuit does not when foot switch engaged.

 

[mmm]

OK, Fixed. Lose solder joint on the footswitch. cleaned joint. Pedal 100% great. love the sound.
Next.... looking for good pedals for Bass guitar. I need a Geddy Lee. Or a USB power to pedal.

 

[mmm]

For the next guy.

The voltage above for IC1 & IC2 are good.
I did replace C2 with a .0047uF (4.7) cap. ~ 3.9 was recommended.
I used a LM1458N & LM13700 vs listed parts on bom per recommendations.
+ A-2997 - 4 Pin 2.54mm DIP SIP IC Sockets Adaptor Solder Type x2 for connections at PCM (https://www.taydaelectronics.com)

My error were:
1. Wiring incorrect the of the 6.5mm 1/4jacks.
2. Loose wire connects at the foot switch PCB.
*Note: Resolve issue through reading threads about the issue on other PCB’s.