Build Your Own Clone Message Board

It is currently Sun Aug 14, 2022 12:52 pm

All times are UTC - 6 hours




Post new topic Reply to topic  [ 12 posts ] 
Author Message
PostPosted: Sat Apr 09, 2022 10:31 am 
Offline

Joined: Mon Apr 27, 2020 10:33 am
Posts: 37
I built the 27V Boost yesterday afternoon and had trouble with it...

The build went well, pretty quick considering I never made a small-format pedal before.

In bypass, everything is fine.

When engaged, the led lights, but no sound... UNLESS I strum very hard which causes a very sharp, staccato screechy sound, then immediately back to silence.

Today's plan is to look at everything with a magnifying glass (again), reflow solder (probably) everywhere...

If that doesn't work, I will be taking pictures and checking voltages on the ICs to post-up later.

But, in the meantime, I was wondering if those symptoms indicate anything obvious I should be focusing on.

Funny thing is, I was documenting this build on video and now I will also be documenting some troubleshooting...


Top
 Profile  
 
PostPosted: Sat Apr 09, 2022 11:14 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 15551
Location: Albany, NY
Unclesixer wrote:
When engaged, the led lights, but no sound... UNLESS I strum very hard which causes a very sharp, staccato screechy sound, then immediately back to silence.

Today's plan is to look at everything with a magnifying glass (again), reflow solder (probably) everywhere...

This is always a good plan, and generally the first thing I recommend. But we've been seeing a rash of IC-related issues of late, particularly with charge pumps and TL072 op amps....and this circuit has one of each. So I'd get a set of DC voltage readings on the pins of each of the IC's and report them here. See left side of the image below for the numbering of the pins.

Image

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

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


Top
 Profile  
 
PostPosted: Sat Apr 09, 2022 1:25 pm 
Offline

Joined: Mon Apr 27, 2020 10:33 am
Posts: 37
OK, figured I would start here... listing pins 1-4 on the left and 8-5 on the right....

My power supply was delivering 8.91

TL072CP
5.51--7.96
5.32--5.37
5.01--5.39
5.41--5.37

7660S
8.91--8.91
4.99--7.10
0.00--6.56
4.91--4.88

I am not so good at reading the schematics yet, but something on that 7660S should have about 18V, right? And a -9V? ALL of those are +V... sorry about the dashes, those are not negatives.

Hopefully taking pictures shorly...


Top
 Profile  
 
PostPosted: Sat Apr 09, 2022 1:58 pm 
Offline

Joined: Mon Apr 27, 2020 10:33 am
Posts: 37
https://drive.google.com/drive/folders/ ... sp=sharing

That should be a link to 4 pictures I hope look good enough to judge my work...


Top
 Profile  
 
PostPosted: Sun Apr 10, 2022 11:56 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 15551
Location: Albany, NY
The charge pump definitely looks bad, but the TL072 may be as well, so contact sales@buildyourownclone.com and ask for replacements for BOTH. Tell 'em DVM sent you. :mrgreen:

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

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


Top
 Profile  
 
PostPosted: Sun Apr 10, 2022 6:00 pm 
Offline

Joined: Mon Apr 27, 2020 10:33 am
Posts: 37
duhvoodooman wrote:
The charge pump definitely looks bad, but the TL072 may be as well, so contact sales@buildyourownclone.com and ask for replacements for BOTH. Tell 'em DVM sent you. :mrgreen:


Thanks, DVM! Email sent. I appreciate your help!


Top
 Profile  
 
PostPosted: Fri Apr 15, 2022 6:04 am 
Offline

Joined: Mon Apr 27, 2020 10:33 am
Posts: 37
Just curious, any way to test the ICs before soldering them in to make sure they are good (esp since I have read about others having trouble with them)? Or maybe it is really best just to test them IN the circuit. I bought a solder sucker, so i hope I am ready for whatever happens.


Top
 Profile  
 
PostPosted: Fri Apr 15, 2022 8:48 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 15551
Location: Albany, NY
Probably the best way to do this would be to have a pedal with a socketed charge pump that you know works correctly and test a new CP in that. This would allow you to confirm good audio performance as well as the correct pin DC voltages. A BYOC Silver Pony or Green Pony would be perfect for that purpose, they're both great boost/overdrive combo pedals, and the kits are very reasonably priced.

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

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


Top
 Profile  
 
PostPosted: Fri Apr 15, 2022 6:17 pm 
Offline

Joined: Mon Apr 27, 2020 10:33 am
Posts: 37
I have a green pony, so I could test the 7660 in that (yes, it is a great pedal, except I plan on modding the capacitors sometime to change the norm/thin/fat frequencies slightly... I think I remember reading some suggestions from you on an old post that made a lot of sense).

What about testing the TL072? is that similar enough to the 4558 in the GP to plug it in there?

Thanks again, very appreciated!

duhvoodooman wrote:
Probably the best way to do this would be to have a pedal with a socketed charge pump that you know works correctly and test a new CP in that. This would allow you to confirm good audio performance as well as the correct pin DC voltages. A BYOC Silver Pony or Green Pony would be perfect for that purpose, they're both great boost/overdrive combo pedals, and the kits are very reasonably priced.


Top
 Profile  
 
PostPosted: Fri Apr 15, 2022 7:15 pm 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 15551
Location: Albany, NY
Unclesixer wrote:
What about testing the TL072? is that similar enough to the 4558 in the GP to plug it in there?

Yes, absolutely. They're both general purpose dual op amps.

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

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


Top
 Profile  
 
PostPosted: Tue Apr 19, 2022 12:36 pm 
Offline

Joined: Mon Apr 27, 2020 10:33 am
Posts: 37
Everything is back together and working well with the new ICs installed! Honestly, I was too impatient to test them first... and also, my de-soldering skills are nothing to write home about... but it works and it is one hell of a clean boost. Had to name it "High Voltage" in honor of the final chorus of Dirty Deeds by AC/DC!

Thanks again, my pedalboard is done for next week's gig! Including capacitor mod on the green pony!


Top
 Profile  
 
PostPosted: Tue Apr 19, 2022 12:37 pm 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 15551
Location: Albany, NY
Great! Go rock that board!! :mrgreen:

_________________
“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  [ 12 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 3 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