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

Notification

Icon
Error

Login


Options
View
Go to last post Go to first unread
colscot  
#1 Posted : Thursday, October 7, 2010 6:07:47 AM(UTC)
colscot

Rank: Member

Groups: Member
Joined: 8/4/2008(UTC)
Posts: 17
Location: Maryland

Guys,

Sorry if this is such a basic question but I want to get this right. I built a Buffalo II, IVY III combo with Placid and Placid BP. It's working, but I am not sure I have the current set correctly. Truth be told, I am not sure what I am doing is correct. I have the voltage on the Placid set to 5.5v and on the Placid BP to 15v. On the Placid BP I am trying to measure from each leg of R1 and R2 and 0v and trying to calculate the voltage drop with respect to the supply voltage. The numbers don't make sense, so I am obviously doing something wrong. Ditto for the Placid.

The combo is working, but I had to increase the current from the Placid to the Buffalo as the LED on the AVCC module was flickering in time to the music. I basically turned it up until it stopped flickering, hardly accurate I know. Clearly something was wrong, and I need to figure out if I have the Placid BP set correctly, probably not.

Appreciate any help.

Colin
Brian Donegan  
#2 Posted : Thursday, October 7, 2010 6:14:41 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)
You should be measuring the voltage across R1 and R2, meaning between the two pins of the resistor itself. Since it has a resistance of 1-ohm, the voltage represents the current (I=V/R -> I=V/1 -> I=V).

avr300  
#3 Posted : Thursday, October 7, 2010 7:28:46 AM(UTC)
avr300

Rank: Member

Groups: Member
Joined: 6/17/2008(UTC)
Posts: 921
Denmark

Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
Don't short (with your probe pin) from resistor to groundplane (top of PCB). You will burn the current limiting potentiometer if done so.
colscot  
#4 Posted : Thursday, October 7, 2010 3:35:11 PM(UTC)
colscot

Rank: Member

Groups: Member
Joined: 8/4/2008(UTC)
Posts: 17
Location: Maryland

Well, looks like I did just that, because the LED's are all out on the same side as VR4 and there is no sound anymore. You live and learn I guess.

Colin
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.