Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login
Issue Placid bipolar fluctuating positive voltage - Positive voltage fluctuates and is lower than negative
Options
View
Go to last post Go to first unread
Previous Topic Next Topic
dariedel2  
#1 Posted : Saturday, November 11, 2017 2:14:57 AM(UTC)
dariedel2

Rank: Member

Groups: Member
Joined: 1/15/2013(UTC)
Posts: 49
United States
Location: DC

Thanks: 1 times
Hello,
My placid hd-bipolar has steady negative voltage of 14.75v. The positive voltage, however fluctuates between 12.5v and 13.5v..
The CCS current is the same for both + and - at around 470mA and the negative shunts 50 mA but the positive shunts 59 mA.

Is this normal or is something off? I’m using fixed resistors in the VR2 spots. I believe they used to be equal at 14.75 v each.

Thanks,
Doug
Back to top

Wanna join the discussion?! Login to your Twisted Pear Audio Support forum accountor Register a new forum account.
Back to top  
Brian Donegan  
#2 Posted : Saturday, November 11, 2017 2:47:55 AM(UTC)
Brian Donegan

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA

Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
Sounds like a cold solder joint. Weak and intermittent connection.

Try adding a little flux and reflowing the joints on the misbehaving side.

Can you post a picture?
Back to top
WWW
dariedel2  
#3 Posted : Saturday, November 11, 2017 3:11:18 AM(UTC)
dariedel2

Rank: Member

Groups: Member
Joined: 1/15/2013(UTC)
Posts: 49
United States
Location: DC

Thanks: 1 times
Brian,
I will add that the system works and is powering the ivy3 with no stuttering in the music. Is that likely or possible with a loose joint?
Anyway, I guess I will re-solder and see what happens. Would you like picture of top side , bottom or both?
Thanks,
Doug
Back to top
Brian Donegan  
#4 Posted : Saturday, November 11, 2017 2:52:39 PM(UTC)
Brian Donegan

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA

Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
Bottom side.

If you are getting 12-13V, the IVY should still work, but I would try to not use it until the fluctuations are fixed.
Back to top
WWW
dariedel2  
#5 Posted : Saturday, November 11, 2017 11:33:51 PM(UTC)
dariedel2

Rank: Member

Groups: Member
Joined: 1/15/2013(UTC)
Posts: 49
United States
Location: DC

Thanks: 1 times
Brian,
Thanks for your help and,as usual, quick response. It turned out to be a fragile/fractured trace on the underside between QP3 and C2A.
I was reviewing picture before I sent, and zoomed in and there it was!
Working fine now.

Thanks,
Doug
Back to top
Rss Feed  Atom Feed
Users browsing this topic
GuestUser (2)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Youtube
Copyright © Twisted Pear Audio