Blue shoe gai pan

[tallenosborne]

Built this circuit, this is my third one and for some reason the sweep and mid control have no audible effect. Isolated the dual gain pot, reflowed all my points on the pots, push works so the haunting mids circuit is working I'm just stumped. Everything on the pedal works. Fets are biased at 4.5v. Help please!

 

[tallenosborne]

I haven’t seen the circuit but measuring components in circuit doesn’t usually yield to nominal reading (because components are often in parallel with others).

Ok, good to know

 

[tallenosborne]

Post pics of both sides of the board please!

Does anything stick out at you?

 

[jimilee]

Your sweep pot lugs, 4,5, and 6 specifically, look like they need to be reflowed. You can see I. The schematic, the miss and sweep pot are in the same audio path, so start with those values.

 

[tallenosborne]

Your sweep pot lugs, 4,5, and 6 specifically, look like they need to be reflowed. You can see I. The schematic, the miss and sweep pot are in the same audio path, so start with those values.

 

[tallenosborne]

solder-sucked and resoldered the pot, still no change, looking at the schematic, it seems as though something is wrong where the signal splits after IC1.1 pin 1 and ties back in after IC2.1 pin 1 cause I'm still getting signal through the circuit. Something must be wrong with either r5, r6, r8, r7, c3, c4 r9, r11, r10, sweep pot or mid pot, or IC2. Which is all located underneath the sweep pot, should've desoldered the whole thing at once these dual pot insulators don't look like they have a conductive/nonconductive side.

 

[tallenosborne]

Your sweep pot lugs, 4,5, and 6 specifically, look like they need to be reflowed. You can see I. The schematic, the miss and sweep pot are in the same audio path, so start with those values.

I posted a reply not sure if it got to you

 

[tallenosborne]

I posted a reply not sure if it got to you

Your sweep pot lugs, 4,5, and 6 specifically, look like they need to be reflowed. You can see I. The schematic, the miss and sweep pot are in the same audio path, so start with those values.

 

[tallenosborne]

Your sweep pot lugs, 4,5, and 6 specifically, look like they need to be reflowed. You can see I. The schematic, the miss and sweep pot are in the same audio path, so start with those values.

Unsoldered leg on c3 is probably the problem

 

[giovanni]

Unsoldered leg on c3 is probably the problem

Was that it?

 

[tallenosborne]

Was that it?

Haven't put it back together yet but everything else around there looks good to me what do you think?

 

[giovanni]

Haven't put it back together yet but everything else around there looks good to me what do you think?

One thing I would do is clean the solder off the board with isopropyl alcohol and a toothbrush. The solder could cause shorts in rare cases and it would make it easier to see the joints.

 

[tallenosborne]

One thing I would do is clean the solder off the board with isopropyl alcohol and a toothbrush. The solder could cause shorts in rare cases and it would make it easier to see the joints.

That wasn't the problem... think I might just leave it how it is and deal. I'll just run my haunting mids into it for now. We will see how well I sleep knowing it's not perfect and go from there

 

[RodrigoRebirth]

Hi, I am facing the same issue as yours. Please, have you solved the Mids issue or not?

 

[giovanni]

Did you check that the dual gang pot works? I usually test all components (pots and switches included) before soldering them in. The one time I failed to do so I had a faulty SPST switch that I had to replace. Also I would put a piece of cardboard between the dual gang and the pot above it. I’ve had shorts like that with dual pots before. They can be a tight fit.

 

[RodrigoRebirth]

Did you check that the dual gang pot works? I usually test all components (pots and switches included) before soldering them in. The one time I failed to do so I had a faulty SPST switch that I had to replace. Also I would put a piece of cardboard between the dual gang and the pot above it. I’ve had shorts like that with dual pots before. They can be a tight fit.

It is working weirdly. Because It starts at 100k and goes down when tweaking up.

 

[RodrigoRebirth]

Did you check that the dual gang pot works? I usually test all components (pots and switches included) before soldering them in. The one time I failed to do so I had a faulty SPST switch that I had to replace. Also I would put a piece of cardboard between the dual gang and the pot above it. I’ve had shorts like that with dual pots before. They can be a tight fit.

Regarding the cardboard between the dual gang and pot, do you have an example of how to do this, please?

 

[RodrigoRebirth]

Updating. I only read some value by testing the pot between lug 1 and lug 3. (starting at 100k and lowering)

 

[tallenosborne]

Updating. I only read some value by testing the pot between lug 1 and lug 3. (starting at 100k and lowering)

I never got this issue resolved, I ended up buying a new pcb and transferring all the pots and IC's to the new board

 

[tallenosborne]

Updating. I only read some value by testing the pot between lug 1 and lug 3. (starting at 100k and lowering)

Additionally, the dual gang pot does need to be insulated from the board as there are no available dust seals for a dual gang pot. PedalPCB carries a dual gang pot insulator under the Utility category. You can use something firm to achieve this as well, just don't try electrical tape or thick heat shrink as the sharp solder joints underneath will eventually poke through it causing a short. The insulator is made out of the same material as the pcb so I recommend something firm like that if you don't want to wait for the insulator. You can test if this is the issue by bending the pot towards the foot switch side of the circuit ever so slightly just to lift it off the pcb a little bit, with the circuit removed from the enclosure

 

[giovanni]

Additionally, the dual gang pot does need to be insulated from the board as there are no available dust seals for a dual gang pot. PedalPCB carries a dual gang pot insulator under the Utility category. You can use something firm to achieve this as well, just don't try electrical tape or thick heat shrink as the sharp solder joints underneath will eventually poke through it causing a short. The insulator is made out of the same material as the pcb so I recommend something firm like that if you don't want to wait for the insulator. You can test if this is the issue by bending the pot towards the foot switch side of the circuit ever so slightly just to lift it off the pcb a little bit, with the circuit removed from the enclosure

It looks like the insulator is there. But there may be a short against the other pot because dual pot take a bit more space overall.