help me out with this schematic/pcb layout

[ccstudios]

I found a modified Blues Breaker schematic here and I put it all in Eagle CAD. I got some boards fabbed from oshpark which I've assembled and IT DOES NOT WORK



Does this Schematic look right to you?

https://www.dropbox.com/s/2fpvs522fldrju8/mg%20schem.png

[pappasmurfsharem]

The first obvious thing that I can see is that those diodes on the second half of the opamp are doing nothing.

Is that Schematic your Re-Drawn one or the original?

If its you're Redrawn can you paste a link to the original?

[ccstudios]

The first obvious thing that I can see is that those diodes on the second half of the opamp are doing nothing.

Is that Schematic your Re-Drawn one or the original?

If its you're Redrawn can you paste a link to the original?

i just noticed that also...that and C11, R12, and C12 needs to go to VB instead of GND.

Ive applied these on the board and its still not working  


heres the one i copied it from:

http://music.codydeschenes.com/wp-content/uploads/2013/05/JHS-Morning-Glory-Schematic.png

[pappasmurfsharem]

You would have to cut your traces especially for the Caps you mentioned if the component legs are in the holes they are going to ground anyway. Unless you have the LEADS of the parts floating as in not on the board.

It would be a lot of work and still no guarentee that it would work.

If you send me your eagleschem and BRD file, or at least upload it to your dropbox I can take a look and make sure there aren't other errors.

If I can see the BRD file I might be able to show you were to make trace cuts so you can salvage those boards.

[ccstudios]

You would have to cut your traces especially for the Caps you mentioned if the component legs are in the holes they are going to ground anyway. Unless you have the LEADS of the parts floating as in not on the board.

It would be a lot of work and still no guarentee that it would work.

If you send me your eagleschem and BRD file, or at least upload it to your dropbox I can take a look and make sure there aren't other errors.

If I can see the BRD file I might be able to show you were to make trace cuts so you can salvage those boards.

just sent a PM

[pappasmurfsharem]

You would have to cut your traces especially for the Caps you mentioned if the component legs are in the holes they are going to ground anyway. Unless you have the LEADS of the parts floating as in not on the board.

It would be a lot of work and still no guarentee that it would work.

If you send me your eagleschem and BRD file, or at least upload it to your dropbox I can take a look and make sure there aren't other errors.

If I can see the BRD file I might be able to show you were to make trace cuts so you can salvage those boards.

just sent a PM

At first glance. If you did what you said in the PM it SHOULD work. granted it probably would have worked before just not in the way you would have expected.

1.Have you made an Audio Probe before?
2. Also I assume your schematic and BOARD passed the DRC and ERC tools?
3. And are you certain all your Electrolytic caps are oriented correctly.?

[ccstudios]

You would have to cut your traces especially for the Caps you mentioned if the component legs are in the holes they are going to ground anyway. Unless you have the LEADS of the parts floating as in not on the board.

It would be a lot of work and still no guarentee that it would work.

If you send me your eagleschem and BRD file, or at least upload it to your dropbox I can take a look and make sure there aren't other errors.

If I can see the BRD file I might be able to show you were to make trace cuts so you can salvage those boards.

just sent a PM

At first glance. If you did what you said in the PM it SHOULD work. granted it probably would have worked before just not in the way you would have expected.

1.Have you made an Audio Probe before?
2. Also I assume your schematic and BOARD passed the DRC and ERC tools?
3. And are you certain all your Electrolytic caps are oriented correctly.?

1. no, ill have to look it up.
2. yes.
3. yes

[pappasmurfsharem]

You would have to cut your traces especially for the Caps you mentioned if the component legs are in the holes they are going to ground anyway. Unless you have the LEADS of the parts floating as in not on the board.

It would be a lot of work and still no guarentee that it would work.

If you send me your eagleschem and BRD file, or at least upload it to your dropbox I can take a look and make sure there aren't other errors.

If I can see the BRD file I might be able to show you were to make trace cuts so you can salvage those boards.

just sent a PM

At first glance. If you did what you said in the PM it SHOULD work. granted it probably would have worked before just not in the way you would have expected.

1.Have you made an Audio Probe before?
2. Also I assume your schematic and BOARD passed the DRC and ERC tools?
3. And are you certain all your Electrolytic caps are oriented correctly.?

1. no, ill have to look it up.
2. yes.
3. yes

This is a "FANCY" way to do it.


I generally just use jack and plug a cable in then use aligator clips with a bit of resistor legging in the teeth. Don't forget the 100n cap though. Don't want any extra DC hitting hte front of your amp.

[ccstudios]

You would have to cut your traces especially for the Caps you mentioned if the component legs are in the holes they are going to ground anyway. Unless you have the LEADS of the parts floating as in not on the board.

It would be a lot of work and still no guarentee that it would work.

If you send me your eagleschem and BRD file, or at least upload it to your dropbox I can take a look and make sure there aren't other errors.

If I can see the BRD file I might be able to show you were to make trace cuts so you can salvage those boards.

just sent a PM

At first glance. If you did what you said in the PM it SHOULD work. granted it probably would have worked before just not in the way you would have expected.

1.Have you made an Audio Probe before?
2. Also I assume your schematic and BOARD passed the DRC and ERC tools?
3. And are you certain all your Electrolytic caps are oriented correctly.?

1. no, ill have to look it up.
2. yes.
3. yes

This is a "FANCY" way to do it.


I generally just use jack and plug a cable in then use aligator clips with a bit of resistor legging in the teeth. Don't forget the 100n cap though. Don't want any extra DC hitting hte front of your amp.

I probed it and I get audio passing but I'm not sure whats the problem. When I touch the probe to the input section, I get audio. Don't know exactly how I'm supposed to use this probe. It seems the problem is lying in the input. I'll try to connect the input wire straight to C4 or R3 instead of going to the pad and I'll see how it reacts

[ccstudios]

It works! Thanks for your help!

I adjusted the board and will order new ones! Thanks again!

[pappasmurfsharem]

It works! Thanks for your help!

I adjusted the board and will order new ones! Thanks again!

What did it end up being?

[ccstudios]

It works! Thanks for your help!

I adjusted the board and will order new ones! Thanks again!

What did it end up being?

a few components were tied to ground when they shouldve been VB. also the clipping diodes werent connected to anything