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Title: Pork Barrel Troubles
Post by: Lucas G. on June 30, 2016, 02:28:58 AM

Hello Guys, I'm having troubles with my Pork Barrel V.1
When I turn it on it sounds like a hooter and I can control it with the knobs haha
I have clean sound and when I turn the trimpot to the right the hooter sound starts and the signal go away.
My voltages is.

IC 1
1-2,23V
2-2,23V
3-2,20V
4-0
5-2,23V
6-2,23V
7-2,23V
8-0

IC 2
1-8,9V
2-4,56V
3-1,60V
4-0,59V
5-0
6-4,56V
7-3,19V
8-3,19V

IC 3
1-8,92V
2-4,57V
3-0
4-4,6V
5-0,32V
6-7,89 - 7,91V
7-3,02 - 3,07V
8-0,59V

IC 4
1- varies
2-4,30 - 4,7
3-varies
4-0
5-4,3 - 4,7
6-2,54
7-varies
8-9,2v

Q1:
E- 1,48v
B- 1,44V
C- 9,03V

Q2:
E- 1,6V
B- 0
C- 0

Q3:
E- 1.6V
B- 1,58V
C- 9,03V

Q4:
E- 3,55 - 3,88
B- 3,39-3,69V
C- 3 - 8,92V

Q5:
E- 0
B- 0,4V
C- 7,45-7,51V

D1: 3,02V
D2: 7,45-7,51V
D3: 9,03V
D4: 8,94V

And here is some pics:
(http://i12.photobucket.com/albums/a224/Lucas_Paulo_Gularte/IMG-20160629-WA0019.jpg_zpswzartsu7.jpeg)

(http://i12.photobucket.com/albums/a224/Lucas_Paulo_Gularte/IMG-20160629-WA0020.jpg_zpssfde5gho.jpeg)

(http://i12.photobucket.com/albums/a224/Lucas_Paulo_Gularte/IMG-20160629-WA0018.jpg_zpso78kv1ib.jpeg)

Someone can help me?? Sorry for my bad english, I speak portuguese so, if its hard to understand what I wrote please let me know. Thank you for all.

Title: Re: Pork Barrel Troubles
Post by: Lucas G. on July 01, 2016, 04:53:51 PM

any help?

Title: Re: Pork Barrel Troubles
Post by: Zigcat on July 01, 2016, 05:32:26 PM

Make sure you made the fixes to the pcb error since that's an early board. It should have the details on Madbean's build guide. I know there is a resistor that has to be added on the underside of the board....correction
... it's a rev1 board so nevermind...

Title: Re: Pork Barrel Troubles
Post by: selfdestroyer on July 01, 2016, 08:19:00 PM

Right off the bat, your voltages for IC1 are way off.. You should be getting 8-9v on pin 8. I did not compare your other voltages.

Take a look at the datasheet for the 4558
http://www.ti.com.cn/cn/lit/ds/symlink/rc4558.pdf (http://www.ti.com.cn/cn/lit/ds/symlink/rc4558.pdf)

and also compare your voltages to the ones in the pork barrel build doc.
http://madbeanpedals.com/projects/PorkBarrel/PorkBarrel_2015.pdf (http://madbeanpedals.com/projects/PorkBarrel/PorkBarrel_2015.pdf)

Edit: I realized I offered no solution.. I would just start by comparing voltages to the build doc. This should at least start pointing you in the right direction of either a short or wrond value part. Hope this helps some how.

Cody

Title: Re: Pork Barrel Troubles
Post by: Lucas G. on July 02, 2016, 02:34:30 AM

I'll be checking all the components off the power stage in the morning!
thanks for your help.

Title: Re: Pork Barrel Troubles
Post by: Martan on July 02, 2016, 02:59:32 AM

Also, your LED"-" and "I" pads look like they might be bridged at the bottom of the board.

Title: Re: Pork Barrel Troubles
Post by: Lucas G. on July 02, 2016, 10:16:58 PM

I've checked and have no bridge there. :/

madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: Lucas G. on June 30, 2016, 02:28:58 AM