[needgoodphones]

I have just assemblied my first attempt at a CMoy amp. The only problem is that it sounds horrible when in an altoids tin. I don't know what to do to fix it. The right channel sounds perfect. However the left channel is just a loud static sound that seems to follow the bass line. When outside the case the amp sounded supurb, but now I don't know what is wrong. I have redone all of the solders to the jacks and the pentometer, however this has not helped the situation. Please help!

 

[JMT]

I will assume that you insulated the tin with electrical tape. Check the jacks in the tin, sometimes you will have a ground problem and will need to insulate the jack(s). See if you can wiggle the jack and at least make the sound come back intermittently.

 

[needgoodphones]

unfortunatly that didn't seem to help. I decided to remove the amp from the case. I desoldered both of the jacks and used alligator clips to hook up the input and output. Then I tested to find the same problem. Next I removed the pot from the signal path to encounter the same problem. Now I am down to what I had working perfectly just yesterday. Could it be the chip has blown?

 

[PinkFloyd]

Why on earth would anybody want to fit a circuit board into a mint tin?

I find there are major sonic advantages to be gained if you fit your PCB into a Big Mac container..... the polystyrene casing adds warmth to the sound. (remember to remove the excess lettuce before attempting to fit anything electrical.. remember 9V can kill ants)

Pinkie

 

[Gariver]

The way I avoid problems is this: Before I solder a joint, I make sure of a good mechanical connection. When I can, I squeeze a joint with my miniature needle point pliers. Then I solder!

In your case, I suggest that you heat up all your solder joints. If that works, you are done. If it does not clear up your problems, then I suggest that you resolder all your suspect joints!

Did you ground your jacks? That's important too!