LED lights up, but only buzzing can be heard

[Mexxx]

Hi! So, I am new to building epdals and today I finished building an LPB clone. I used the true bypass schematic provided at GGG.com for offboard wiring. the thing is - when I plug in the input cable, and push the 3pdt switch, the led lights up and it works properly, but when I turn on the amp, I can hear only buzzing from the amp and it doesn't respond to strums. What could be the problem?

[Jdansti]

This might sound insulting, but it's the first thing I would check if this were my project. Make sure your guitar and cables all work with your amp.

Next, does it work in bypass mode?   

I assume you do not have it in an enclosure yet.  Do the input and output jacks both have a ground connection?  If not, ground them and try it. Beyond that, you'll need to post photos of both sides of the board, the off board connections, and the layout you are using before we can go much further.

[Mexxx]

I cant get my hands on my camera right now, because it is far away right now, but I drew a schematic of the layout I have (double checked everything).

This is the layout I made - http://imageshack.us/f/706/47660630.png/

This is the LPB layout - http://diy-layout.com/25

This is the GGG layout for offboard wiring - http://www.generalguitargadgets.com/pdf/ggg_sw_3pdt_tb_bat.pdf


Also, maybe I messed up the input and output jacks?
- sleeve is the pin, that is connected to the middle, tip is the longest thingy, and ring is the third remaining?


I will post photos when I will get my camera, but can't this help in any way?

Thanks for your quick response

[Jdansti]

Just looking at the drawings, the bypass circuit in your drawing is different than the GGG drawing.  For example, follow the input wire from the board to the switch and through the switch and you'll see what I mean.

Having said that, I think the bypass circuit you used is fine and it matches the fifth circuit shown here: http://www.tonepad.com/getFile.asp?id=76.

Your description of the jack appears to be correct. You could still have a problem with a solder bridge, a backwards part,  or something miswired. We'll know more when we see the photos.

[Mexxx]

Damn, why the hell did I mess up the switch? Allright, gonna re-solder it. Thanks for your help so far

[Mexxx]

So, the thing was - I used this layout - http://www.generalguitargadgets.com/pdf/ggg_sw_3pdt_tb_gi_bat.pdf
It says, that with this one the input is grounded. Why didn't it work for me?

Anyway, I re-soldered the wires and now everything works perfectly, so thank you!

The last thing is - will the buzzing stop, when the parts will be in a fixed position in a box or is it entirely because of bad soldering?

[Jdansti]

It might stop buzzing when you get it in the enclosure, but if there is a problem somewhere, it won't.

[IvIark]

If you want to potentially save yourself a lot of wasted time and stress, I'd seriously recommend not even soldering up the switch until you know the board is working as it should.  You could wire up the input and output sockets and use a little terminal block for battery connections and connect all your grounds together, and then do something like this before you even think about all the peripheral offboard wiring:

http://i76.photobucket.com/albums/j6/IvIark_2006/DIY/Mark%20Builds/1012110003_2.jpg

Input socket to board input, board output to output socket.

At least when you know the effect is working properly it means that any problem following that has to be down to your offboard wiring or the switch and so narrows things down a lot.

[Jdansti]

If you want to potentially save yourself a lot of wasted time and stress, I'd seriously recommend not even soldering up the switch until you know the board is working as it should.  You could wire up the input and output sockets and use a little terminal block for battery connections and connect all your grounds together, and then do something like this before you even think about all the peripheral offboard wiring:

http://i76.photobucket.com/albums/j6/IvIark_2006/DIY/Mark%20Builds/1012110003_2.jpg

Input socket to board input, board output to output socket.

At least when you know the effect is working properly it means that any problem following that has to be down to your offboard wiring or the switch and so narrows things down a lot.

+1 I always test my circuits without the switch and LED first. I add the switch and LED next and test again
If it doesn't work, I know that the problem probably happenned while wiring the switch or LED.  I do a final test after installing the board in the enclosure.