FreeTrack Forum

Welcome, you're not connected. ( Log in - Register )

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Power supply: regulated vs. unregulated?

Pages (2): 1 - [2]
RSS >  Power supply: regulated vs. unregulated?, And what about LD271 LEDs?
JayPeeII #16 01/09/2013 - 21h01

Class : Apprenti
Posts : 26
Registered on : 31/08/2013

Off line

That's the point, they are filed down.

EDIT: Steph, I have some trouble interpreting the LED's fixed relation between Vf and If. Hence I can't quite follow how you come up with 6.8Ohms. If I would aim for Vf 1.5, the graph in the datasheet says the according If is 130mA. But 1.5V and 130mA require 3.85Ohms, not 6.8Ohms.

Please let me know since I don't feel like blowing up my LEDs and starting all over again.

Thanks!
Edited by JayPeeII on 02/09/2013 at 13h11.
Steph #17 02/09/2013 - 13h44

Class : Moderator
Posts : 656
Registered on : 16/11/2007

Off line

Do you got a multimeter?
Measure current and voltage of your present mount, so we will get fixed if it was a problem of LED insensitivity or if we have to look for better cam settings and filter solution.

(If you are not sure how to measure, just ask.)
Edited by Steph on 02/09/2013 at 13h46.
JayPeeII #18 02/09/2013 - 14h14

Class : Apprenti
Posts : 26
Registered on : 31/08/2013

Off line

Ive got an old digital multimeter with all kinds of settings, like "Ohms K", "V dc", "V ac" and whatnot on a horizontal switch and 2mA, 20mA and stuff like that on a vertical switch. I've got no clue how tp measure...

Oh and it his two outputs to connect measuring pins to. One output has a lightning flash icon and the other has some numerical values next to it. The measuring pins come in a red one and a black one. Hope you can guide me through it...

Could you also tell me first how to verify if the multimeter is working correctly? Because one measuring pin is full of white/green-ish stuff.. Like it was dipped in something. Doesn't look well so I would like to rule out faulty measurements.
Edited by JayPeeII on 02/09/2013 at 14h46.
Steph #19 02/09/2013 - 15h11

Class : Moderator
Posts : 656
Registered on : 16/11/2007

Off line

Do you got a picture (or reference) of it so I can see what it looks like?
JayPeeII #20 02/09/2013 - 15h22

Class : Apprenti
Posts : 26
Registered on : 31/08/2013

Off line

not right now but like i said, it had a vertical selector with

20 mA
200 mA
2 A
20 A

and a horizontal selector with

Amperes
Ohms
V dc
V ac

If you need to know very specific icons and markings I would have to wait till tonight to make a picture of it.

And it has two connectors for the measuring pins. I assume the red pin to the lightning flash connector and the black pin to the other.
Edited by JayPeeII on 02/09/2013 at 15h27.
Stormrider #21 02/09/2013 - 16h08

Class : Légende du Forum
Posts : 466
Registered on : 02/01/2013

Off line

what kind of brand is your multimeter?Maybe we find some picture on the internet.
V-Dc= voltage direct current
V-Ac = voltage alternating current
Did you ever use a multimeter yourself?
Steph #22 02/09/2013 - 17h50

Class : Moderator
Posts : 656
Registered on : 16/11/2007

Off line

Put the vertical selector on "200mA" and the horizontal on "Amperes"

The red pin is + and the black -

Measure current flow as follow:

Posted Image

Now you read the value on the 200mA scale.

We don't need voltage for the moment.
JayPeeII #23 02/09/2013 - 18h21

Class : Apprenti
Posts : 26
Registered on : 31/08/2013

Off line

I assume the LED set up has to be plugged in the power for that?

EDIT: Well, I assumed I had to plug it in so I did. I connected the multimeter's pins as you posted in the picture and it gave 97 / 98 mA with a 6,8Ohms resistor as you told me as well. Going to wrap it up and connect the last two ends right now to see if it works.
Edited by JayPeeII on 02/09/2013 at 18h56.
Pages (2): 1 - [2]

 >  Fast reply

Message

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Power supply: regulated vs. unregulated?

 >  Stats

1 user(s) connected during the last 10 minutes (0 member(s) and 1 guest(s)).