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Projects => Tech Help - Projects Page => Topic started by: jonnygreentrees on January 19, 2017, 09:05:28 AM

Title: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 19, 2017, 09:05:28 AM
Finished up my Pork Barrel last night and I'm not getting any effect. When I engage the effect the signal gets slightly brighter but there's no chorus. I've tried adjusting the trimmer to no avail.

Here's some photos of my build, any idea where I should start looking for issues?

(http://i73.photobucket.com/albums/i211/staticinthecities/083434BB-1277-46E8-AA20-FA0AADB5AE97_zpsdenwkmyr.jpg)


(http://i73.photobucket.com/albums/i211/staticinthecities/0E2E97BA-B872-4CE6-9877-51B38FE1168D_zpshwaa7ffc.jpg)
Title: Re: Pork Barrel - no chorus effect
Post by: zombie_rock123 on January 19, 2017, 09:55:19 AM
The ground wire next to 9 volt looks like it could do with a reflow but really IC voltages would be the best way to show where the problem is.
Title: Re: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 19, 2017, 09:58:37 AM
Thanks, I'll measure the IC voltages and get back to you
Title: Re: Pork Barrel - no chorus effect
Post by: darrenw6000 on January 19, 2017, 10:00:02 AM
Where were the mn3101 and mn3007 sourced from?
Title: Re: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 19, 2017, 10:09:04 AM
I got them from this German website
http://www.musikding.de/wartung.php
Title: Re: Pork Barrel - no chorus effect
Post by: darrenw6000 on January 19, 2017, 10:47:04 AM
Ok they should be fine. It's just when u do an effect with these sort of chips if you get a signal through then the chips could be at fault but I don't think that this is the case. I will try and think what else it could be
Title: Re: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 19, 2017, 10:55:28 AM
well that's what I thought it has to be the chip or the part of the circuit that mixes the delay chip signal in with the dry?
Title: Re: Pork Barrel - no chorus effect
Post by: darrenw6000 on January 19, 2017, 09:41:13 PM
is that a little solder bridge between r21 and r24 on the top side, i can see a small silver bit. these resistors do come into play after the signal has passed through the bbd
Title: Re: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 20, 2017, 08:56:47 AM
I'll double check!
Title: Re: Pork Barrel - no chorus effect
Post by: darrenw6000 on January 21, 2017, 11:35:07 AM
any luck
Title: Re: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 23, 2017, 03:24:50 PM
sorry been really busy will try and have a look this week
Title: Re: Pork Barrel - no chorus effect
Post by: darrenw6000 on January 24, 2017, 10:37:06 PM
If it's not that then look at your R12, not quite sure in the pic but looks like you may have used a 47R(yellow-violet-black) meant to be 470R(yellow-violet-brown)
Title: Re: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 27, 2017, 10:29:16 AM
OK so there's no solder bridge between R21 and R24 and R12 is 470R.

Going to take the voltages tonight.

Does LED2 need to be installed for the circuit to work?
Title: Re: Pork Barrel - no chorus effect
Post by: Jebus on January 27, 2017, 07:14:56 PM
Quote from: jonnygreentrees on January 27, 2017, 10:29:16 AM
Does LED2 need to be installed for the circuit to work?

Thats just rate indicator, shouldnt cause any issue if not installed.
Title: Re: Pork Barrel - no chorus effect
Post by: jonnygreentrees on January 27, 2017, 08:21:47 PM
Oh ffs I'm an idiot, a row of pins from the clock chip hadn't gone into the socket can't believe I missed that! Working great now!
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