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CMoy grounding problem

post #1 of 6
Thread Starter 

There's this buzz when I touch some parts of the circuit, as tangent's article suggests it's likely a grounding problem

How should I properly ground it? I tried with different layouts but still have the same problem

 

 

Here's some pictures

 

http://i2.minus.com/iBP1Dx0CpHFrz.jpg

http://i6.minus.com/iOj8EsFxdyCOT.jpg

http://i5.minus.com/ib2kXd4OB9cEqb.jpg

 

 

 

What am I doing wrong?

post #2 of 6

You built a radio antenna. :)  I bet you hear changes if you wave your hand over the amp.  For one, put the resistors and jumper wires closer to the board.

post #3 of 6

It's a common problem.  You try to build an oscillator and end up with an amplifier.  You try to build an amplifier and end up with an oscillator. With modern high speed devices, even an extra 1/2 inch (1cm) of wire can cause problems.

post #4 of 6
Thread Starter 

I reduced the wires and leads, but it didn't help
I don't think that's the problem because it was the same when I made it directly on the pc board

post #5 of 6

You probably don't have a problem you are just touching the inputs of the op-amp and acting as a human antenna, the solution is to stop touching it :-)

 

cheers

FRED

post #6 of 6
Thread Starter 
Quote:
Originally Posted by Fred_fred2004 View Post

You probably don't have a problem you are just touching the inputs of the op-amp and acting as a human antenna, the solution is to stop touching it :-)

 

cheers

FRED


Really? I feel stupid now
That's probably it

Well, thanks everyone

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