[Necroist]

I'm experiencing some problem with my 2nd attempt cmoy.

Here are some of the parts are I used :

1 9V Batt
2 0.22uF 63+V Cap
2 470uF 16V
1 OPA2132PA

The rest are all the parts tangent used in his guide.

Right now the amp is able to produce a sound but there's some kind of background noise. Even when I got no source plugged to the amp, there's a continous tone that can be heard through my earphones.

It goes something like : "drooot. crack. pause. droot. crack. pause" (repeat)

 

[eyevancsu]

is it in a case yet? The standard suggestion is to recheck your grounding scheme, and check for solder bridges or incorrect connections.

 

[Necroist]

Its not in a case yet. I'm using crocodile clips to clip my line-in, line-out jacks, power supply jacks.

 

[blipblop]

Check your connections, and interference. I'm curious as to what would cause such a patterned repetition of interference.

 

[Necroist]

thanks, it has been solved.

just a side question, how do you guys cut your protoboard?

 

[ProFingerSk8er]

i use a dremel, a lot faster but also a lot more expansive

you can just score the board few times with backside of a xato knife, once it's about half way deep, clamp to a flat surface's edge and snap the board in half

 

[eyevancsu]

Thats what i do, except i score both sides with any blade and then snap in half with your good ol' fingers, scoring on both sides gives a cleaner cut/break/snap.

 

[Sync]

Im curious...what was the problem and how did you fix it?

 

[Necroist]

I figured that the distortion was due to me not grounding the circuit properly.

I had to step by step, check the soldering for any short circuits or any un-necessary or accidental connections.

After that, it pretty much worked