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

Notification

Icon
Error

Login
Placid BP - Problem Increasing Output Voltage by Adjusting VR3 & VR4
Options
View
Go to last post Go to first unread
Previous Topic Next Topic
Voodoo002  
#1 Posted : Wednesday, April 6, 2011 12:18:33 PM(UTC)
Voodoo002

Rank: Member

Groups: Member
Joined: 9/11/2010(UTC)
Posts: 6
Location: United Kingdom
Hi,
I'm a bit of a noob when it comes to DIY audio so I might be doing something stupid here...
Following the instructions I had no problem adjusting VR1,2,3 and 4 to the correct Ohms, I connected the power supply and had 4 LEDs light up and everything seems to check out fine.
However I cannot get the voltage to increase or even decrease when I adjust VR3 and VR4, one output reads 1.6V and the other 1.3V but it does change when I adjust VR1 and VR2 for some reason.

I'd appreciate any help :)

Edited by user Wednesday, April 6, 2011 12:19:23 PM(UTC)  | Reason: Not specified
Back to top

Wanna join the discussion?! Login to your Twisted Pear Audio Support forum accountor Register a new forum account.
Back to top  
mimp  
#2 Posted : Thursday, April 7, 2011 1:35:44 AM(UTC)
mimp

Rank: Member

Groups: Member
Joined: 9/18/2010(UTC)
Posts: 10
Location: UK
Voodoo002 wrote:
Hi,
I'm a bit of a noob when it comes to DIY audio so I might be doing something stupid here...
Following the instructions I had no problem adjusting VR1,2,3 and 4 to the correct Ohms, I connected the power supply and had 4 LEDs light up and everything seems to check out fine.
However I cannot get the voltage to increase or even decrease when I adjust VR3 and VR4, one output reads 1.6V and the other 1.3V but it does change when I adjust VR1 and VR2 for some reason.

I'd appreciate any help :)


I'm also fairly new to all this but had pretty much the same symptoms as you with the placid (I think the BP is more-or-less two placids on one board) and it turned out I'd soldered in one of the transistors backwards. so that might be checking - QP2 specifically.
Back to top
Voodoo002  
#3 Posted : Thursday, April 7, 2011 5:47:25 AM(UTC)
Voodoo002

Rank: Member

Groups: Member
Joined: 9/11/2010(UTC)
Posts: 6
Location: United Kingdom
thanks mimp, but the transistors are soldered fine Brick wall
Back to top
Brian Donegan  
#4 Posted : Thursday, April 7, 2011 5:55:32 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)
I would triple-check that all the transistors are in the proper spots
Back to top
WWW
Voodoo002  
#5 Posted : Thursday, April 7, 2011 8:50:03 AM(UTC)
Voodoo002

Rank: Member

Groups: Member
Joined: 9/11/2010(UTC)
Posts: 6
Location: United Kingdom
Ah! Thanks Brian will rectify this skool boy error d'oh!
Back to top
Voodoo002  
#6 Posted : Thursday, April 7, 2011 12:21:27 PM(UTC)
Voodoo002

Rank: Member

Groups: Member
Joined: 9/11/2010(UTC)
Posts: 6
Location: United Kingdom
All sorted now and the buffalo is singing those sweet, sweet tunes!

Fantastic DAC you've created Russ and Brian Applause

Tridents tomorrow Drool
Back to top
Rss Feed  Atom Feed
Users browsing this topic
GuestUser
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