Chimaera with no gain please help!

[midwayfair]

Okay there is an error on the pdf of my build. C7 and C8 are reverse. Do you think it could solve my problem? I'll try it tomorrow.

I believe they're still correct on the BOM. But it you were filling the PCB following the schematic and not the BOM, it would make a HUUUUUUGE difference.

[JPGraphX]

What do you mean you think they are correct?

C7 is inverse on bom and schematic..

[midwayfair]

What do you mean you think they are correct?

C7 is inverse on bom and schematic..

No. Look again. C7 on the bill of materials is a 390pF ceramic cap. The PCB image shows a space for a ceramic cap labeled C7. In the schematic, that ceramic cap is labeled C8. The value is correct for the placement in the circuit (and this cap is responsible for the treble "loss" when increasing the gain.) The schematic has the wrong number for the correct part. The bill of materials has the correct value for the correct part on the PCB. Like I said, if you were filling the PCB from the schematic, you would have swapped the cap. If your build as a 390pF cap in the C7 slot and an 82nF cap in the C8 slot, then it's built correctly and your problem lies elsewhere.

[danielzink]

hmmmmm...

doesn't the guy who produces these boards have a forum where he's more than happy to discuss issues like this and help people out ?

oh yeah....google found it:

http://www.grindcustomsfx.com/forum/

[JPGraphX]

Lol, don't do me the Google thing lol. I'm one of the top user of Google. I wrote there but with no answers.. So I came here. Midway, I think you are wrong, I wrote to pcb owner and told me c7 is 82nf,they are reversed. I am doing it now, will post soon

[JPGraphX]

Thread solved!!!

Here was my problem. I have soldered PCB like BOM was showing. But C7 and C8 is reverse.

So I resoldered my 2 capacitors. Ooops, dual gang is now reverse.. So I rewired it like it was suppose to be..

Everything working fine now! Boom!

Thanks to all of you for your cool help and tips.

@midwayfair: I have built an audio probe and I thank you very much for that, I'll keep practicing with it and it will help much to debug.

Cheers!
JP

[midwayfair]

Lol, don't do me the Google thing lol. I'm one of the top user of Google. I wrote there but with no answers.. So I came here. Midway, I think you are wrong, I wrote to pcb owner and told me c7 is 82nf,they are reversed. I am doing it now, will post soon

okay, fair enough. His PCB image didn't have a trace mask.

Glad you got it working!

[JPGraphX]

Yeah wish there was a trace mask! Thanks again!