Build Your Own Clone Message Board

It is currently Sun Jun 13, 2021 1:58 pm

All times are UTC - 6 hours




Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: 27v Boost silence
PostPosted: Thu May 06, 2021 9:18 am 
Offline

Joined: Mon Apr 28, 2014 10:51 am
Posts: 12
Location: Florida
So, I am currently going through the forums and reviewing the schematic, checking my resistors, etc, but in the mean time I wonder if there is a idea of where to look. Put the pedal together, plugged it in, worked great. Over the next 30 minutes it became quite noisy, increasing in volume (the noise with nothing being processed) and then it just stopped passing signal when engaged. Of course, passes signal fine when bypassed, LED comes on when engaged but no audio.

Thanks in advance for your suggestions.

A

Photos;

https://www.flickr.com/photos/57601422@N03/shares/69r1SC


Last edited by fixnmix on Thu May 06, 2021 10:33 am, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 9:23 am 
Offline
Moderator
User avatar

Joined: Tue Feb 09, 2010 4:45 pm
Posts: 4256
Location: Rochester, NY
Usually good bypass and LED but bad effect signal is a soldering issue or a misplaced component. The fact that it worked at first is a little unusual, although the mini kits are perhaps more prone to physical problems developing as you move the pedal around, since they are stuffed so tightly.

In any case, we'll need photos to be of any real help. I know it's a hassle, particularly with the small case, but we need you to open it up and show us all your component placement, the soldering on the underside, and as much of the wiring as you can. Let us know if you have issues with getting the photos attached or uploaded.

_________________
Scott

My band, Austin Hollow


Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 9:49 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 14643
Location: Albany, NY
Do you have access to a multimeter and know how to measure DC voltage with one?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 10:15 am 
Offline

Joined: Mon Apr 28, 2014 10:51 am
Posts: 12
Location: Florida
duhvoodooman wrote:
Do you have access to a multimeter and know how to measure DC voltage with one?



I do and I am just getting ready to do that, I found that info in another post.


Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 10:39 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 14643
Location: Albany, NY
Cool! Please get a set of DC voltage readings on the pins of both IC's and post them here. Note that some of the values should be negative. See left side of the image below for the numbering of the pins. And we'd still like to see those photos that Scott requested.

Image

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 11:01 am 
Offline

Joined: Mon Apr 28, 2014 10:51 am
Posts: 12
Location: Florida
duhvoodooman wrote:
Cool! Please get a set of DC voltage readings on the pins of both IC's and post them here. Note that some of the values should be negative. See left side of the image below for the numbering of the pins. And we'd still like to see those photos that Scott requested.


Yes,

Think I found at least part of the issue;

7660S

9.2 9.2
6.6 7.1
1.mV 5.2
289.mV -1.4


TL072
4.6 11.6
4.6 4.6
3.4 4.6
-1.3 4.5


Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 11:08 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 14643
Location: Albany, NY
Definitely looking like a problem on the 7660S charge pump. Here are my 27V Boost voltages:

7660S:

1: 9.96
2: 5.20
3: 0
4: -4.57
5: -9.55
6: 5.16
7: 6.58
8: 9.96

TL082:

1: 4.98
2: 4.98
3: 3.75
4: -9.55
5: 4.98
6: 4.98
7: 4.97
8: 18.24

While a bad 7660S is a possibility, there could also be a solder joint problem underneath the PCB or with an adjacent component. Still need to see the photos.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 11:20 am 
Offline

Joined: Mon Apr 28, 2014 10:51 am
Posts: 12
Location: Florida
duhvoodooman wrote:
Definitely looking like a problem on the 7660S charge pump. Here are my 27V Boost voltages:



While a bad 7660S is a possibility, there could also be a solder joint problem underneath the PCB or with an adjacent component. Still need to see the photos.



I have a link in my original post for that.


Top
 Profile  
 
 Post subject: Re: 27v Boost silence
PostPosted: Thu May 06, 2021 11:26 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 14643
Location: Albany, NY
OK, thanks--just viewed your photos and there's nothing that stands out. I'd suggest reflowing the solder joints for all 8 pins on BOTH IC's and then retest (the PCB assembly doesn't need to be in the enclosure for this). If it still doesn't work, contact sales@buildyourownclone.com and ask for a replacement charge pump. Because the pedal stopped working so quickly, they should replace it for you free of charge.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group