Boneyard Problem - no sound (voltages inside)

[memor82]

Hi everybody,
I've a problem with my boneyard.
I've the bypass signal but not the effected.
And I hear the changing of the channels (low/high/boost)
because I hear the "noise" that increases (but without any guitar's sound).

I use  LF347 and the ICL7660S.
Voltages of ICL7660s are:

1=9,69
2=4,85
3=0
4= -4,63
5= -9,39
6=5,14
7=7,62
8=9,69

Voltages of LF347 are:

1=0
2= -0,3 mV
3=0
4= 9,68
5=0
6=0
7=0
8=0
9=0
10= -0,3mV
11= -9,38
12=0
13= -1,5mV
14= -1,5mV

When I put togheter the parts there was a litlle bridge of solder between the pin 11 and 12
and when I try to power the pedal there was no signal (and no noise increasing with changing channels).
Now , that I corrected the error, only increasing noise changing channels.

I also add a ground wire input sleeve-> output sleeve because
the pedal was hum-noisy!

I attach pictures :-D
Thank you very much, and sorry for my english
Andrea

[jimilee]

Looks like you have several joints that are touching, make sure they are supposed  to be.

[memor82]

Looks like you have several joints that are touching, make sure they are supposed  to be.

Yes but I verified with schematics and where there are links below there is the copper..if I check correctly :-)

[jimilee]

Do you have the dc jack ground connected to the input sleeve also?

[memor82]

Do you have the dc jack ground connected to the input sleeve also?

No...i've only the wire from ground of dc jack to the pcb

[jimilee]

What happens when you do that? Do you get sound then?

[memor82]

What happens when you do that? Do you get sound then?

Nothing.no sound :-(

[memor82]

Thank you jimilee!
Another "info".
It seems that the lights of the leds (green/yellow/red) are low than usual
(I used 3 x 4,7k resistors as indicated)

Thanks mates

[wgc]

You probably have a short somewhere. Theres a few places on your pcb where it looks like a lead is touching the ground plane. Also a bit of solder splatter. Double check your switch wiring. Frustrating but likely something small and simple.

[memor82]

You probably have a short somewhere. Theres a few places on your pcb where it looks like a lead is touching the ground plane. Also a bit of solder splatter. Double check your switch wiring. Frustrating but likely something small and simple.

Thanks wgc!
The wiring seems correct
Also I've a problem.
I can't remove the solder splatter from the copper with the desoldering pump.
Any suggestions?

[mgwhit]

Also I've a problem.
I can't remove the solder splatter from the copper with the desoldering pump.
Any suggestions?

Desoldering braid is more effective for cleaning etched boards.  Place the braid over the bridge and apply the iron to the top of the braid.  When heated, the stray solder would much rather be on the copper traces or in the braid than anywhere else.  Much less chance of lifting a trace that way.  I only find desoldering pumps useful for removing components.

[memor82]

Found it!
A little join on the right of the photo.
I've scratched with a small screwdriver the join and voilà!
After I'll desolder correctly the solder

But I see that the pedal seems a little noisy with all the three configurations..
and the leds, expecially yellow and green, seem still low than usual

[Haberdasher]

hopefully the noise will clean up some once it's boxed.
if they are diffused yellow & green, those things are often very dim.  the only thing you can do is maybe try a lower value on their resistors like 2k2.  it might take some experimentation.

[memor82]

hopefully the noise will clean up some once it's boxed.
if they are diffused yellow & green, those things are often very dim.  the only thing you can do is maybe try a lower value on their resistors like 2k2.  it might take some experimentation.

Thanks Haber
I'll buy some yellow BRIGHT and green BRIGHT led with the same 4,7k resistors
Just a doubt.
The ground wire from input sleeve-> output sleeve.
Can I'll remove it when I'll box the pedal?
Thanks!

[jimilee]

hopefully the noise will clean up some once it's boxed.
if they are diffused yellow & green, those things are often very dim.  the only thing you can do is maybe try a lower value on their resistors like 2k2.  it might take some experimentation.

Thanks Haber
I'll buy some yellow BRIGHT and green BRIGHT led with the same 4,7k resistors
Just a doubt.
The ground wire from input sleeve-> output sleeve.
Can I'll remove it when I'll box the pedal?
Thanks!

Yep, it will get continuity through your enclosure.