Ruby Debugging Problem

[rbrenne]

Hi everyone.

I'm having a major problem debugging my Ruby amp I made using the ROG diagram.  I've been looking at the other topics, but can't seem to find a solution.  With everything connected I get a loud vibrating buzz from the speaker with no guitar signal coming through at all.  I've tripled checked the connections, looked for solder bridges, swapped my 100 cap with a 470, disconnected my LED thinking I may be overloading it. Nothing has been getting rid of the buzz and the volume and gain pots seem to control it.

Any other things I can try? I can't figure out why there is no guitar sound coming through at all. This is my first DIY so I'm pretty new to electronics.

Thanks!

[rbrenne]

[iq01221]

Maybe reversing the fet, or improve with it... It works for me

[rbrenne]

Having trouble inserting pictures....

<img "https://lh4.googleusercontent.com/-gv4HXN0qtEg/Tiet60dd81I/AAAAAAAAAEw/tklVCSJc4U8/s640/IMG_20110721_001733.jpg" /img>

<img "https://lh5.googleusercontent.com/-AppltjaZoYE/TiezAnOLCCI/AAAAAAAAAFI/9kAAvgA2rUY/s512/IMG_20110721_001745.jpg" /img>

<img "https://lh4.googleusercontent.com/-wKpTADf82K0/TiezYf-zJaI/AAAAAAAAAFY/UuIkBUjFXV8/s640/IMG_20110721_001754.jpg" /img>

<img "https://lh4.googleusercontent.com/-mj9BTtzsnjA/Tiezs_DlrtI/AAAAAAAAAFo/j5AuSN88z1g/s640/IMG_20110721_001810.jpg" /img>

<img "https://lh3.googleusercontent.com/-odPo2xBCPPQ/Tiez9Rxq7zI/AAAAAAAAAF4/xvq2_H2_8SY/s640/IMG_20110721_001917.jpg" /img>

[rbrenne]

The first time I tried to build the board I had the fet reversed and go no sound at all. When doing it this way I got the buzzing. Everything seems to be clean between the solders too despite how the picture may look.

[JOHNO]

Have you got a multimeter? Can you measure the voltages from ground to all the pins on the LM386 and the D,S,G of the fet.

[rbrenne]

I do have a multimeter. Is there a thread of what all of the voltages should be for the ruby? Also do you think I should swap the 100 cap back instead of the 470?

[rbrenne]

My multimeter voltages are:

Pin 1: 1.1
Pin 2: 0
Pin 3: 0
Pin 4: 0
Pin 5: 2.0
Pin 6: 6.4
Pin 7: 3.2
Pin 8: 1.1

G: 5.1
S: 5.0
D: 6.4

Any ideas? Thanks again for the help and replies!

[JOHNO]

What is your supply voltage.
Here are voltages from a working unit, Supply voltage during testing was 9.01V
1- 1.35v
2,3,4- 0v
5- 4.17v
6- 9.01v
7- 4.54v
8- 1.35v

G- 0v
S- 2.68v
D- 9.01v

My guess is something is pulling down you supply voltage, you have a short somewhere. I think it is probably around the fet.
I really think you should start over again. There is way too much solder on your board, go easy on the @#$%ing solder dude. Plan the build before starting and work slowly and as cleanly as you can. I mean no disrespect to you with my comments friend but lets be honest, that build looks like a @#$%ing dogs breakfast.
With careful planing of the circuit you should be easily able to build this circuit with no jumper wire at all. Just poke the components through the holes and bend the component legs to where they are supposed to connect and solder in position. Ive built these on an old piece of cardboard using that method. Draw in out on paper first. There must be a nice layout of this somewhere in the gallery.
Johno

[rbrenne]

Thanks for the voltages.

Like I said in the original post I'm a beginner. I tried this circuit as a hobby and came on here to learn more.

I appreciate constructive criticism, but I don't really care for the digs at my work or your ability to make this on cardboard.  No disrespect friend. 

[JOHNO]

  You say you want to learn, well i'm trying to help you learn by pointing out the obvious. Sometime the truth hurts, i can't change that.