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LED Display is too weak |
jfornech
Registered to :
17-03-2005
From France
Messages : 39
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|  Posted 26-05-2005 at 12:41
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Hello,
My LED display got very weak intensity . I checked if 5 V came to the display card, and it's look good . But the voltage between the 8 pins connector and the other there is 0.5 V  ...
Why ?
JFO
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jfornech
Registered to :
17-03-2005
From France
Messages : 39
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| Posted 26-05-2005 at 13:11
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How to be sure my display ard II is corectly powered in 5 V ?
JFO
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Pepe
Registered to :
03-07-2003
From Argentina
Messages : 565
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| Posted 26-05-2005 at 13:25
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Do You use the proper model of digit?. Do you have USB expansion?. With the USB card connect to PC and the master don´t connect to power supply, the display turn on weak. The power source of the display is thru the master. If you have USB, you must connect to power only the master.
Jose Olliver
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jfornech
Registered to :
17-03-2005
From France
Messages : 39
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| Posted 26-05-2005 at 19:53
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Hello jose,
- I use the KINGBRIGHT SC36-11HWA
- i got USB expansion
- i got only one alimentation 5V and it's connect to the master card only not to the usb card .
JFO
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Ken
Registered to :
24-06-2004
FromCanberra Australia (near YSCB)
Messages : 123
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| Posted 27-05-2005 at 00:28
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I can't solve your problem JFO. I have the same SC36 LEDs and board. They display quite brightly in my MCP.
Remember, the board is a multiplexer. It basically uses the crystal to distribute the 5v power to each of the segments in sequence. Each LED segment is not on all the time. You can see this effect if you shoot the LEDs with a high speed movie or videocamera. They will flicker. I'm not sure what your RMS voltmeter should read when you connect it to directly to a segment but I would suspect it would be a lot lower than 5v.
Lots of luck. I'm sure someone will get back to you with a solution.
Ken R.
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Ferdie
Registered to :
23-05-2003
FromHuelva
Messages : 2094
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| Posted 27-05-2005 at 01:58
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Remember... You not need resistors !
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jfornech
Registered to :
17-03-2005
From France
Messages : 39
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| Posted 27-05-2005 at 09:13
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I got a idea .
Is it possible to make a parallel connection on each digit segment with a resistor to increase the voltage intensity in the display ?
JFO
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Anonymous
User not Registered | Posted 29-05-2005 at 23:29
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Hi, I have the same problem with the same digits... I was thinking about being the digits and was about to order the SRWA ones... but now...
They can be barely seen daytime, I have 5v connected to master card and not to USB from an ATX supply.
If anyone can give a trick would be glad.
Vincenzo
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Ferdie
Registered to :
23-05-2003
FromHuelva
Messages : 2094
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| Posted 30-05-2005 at 14:24
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I use IOCard Displays multiplexed and same digit 7s Kingbright model.
I use also a black filter !
And this is the perfect bright of my MCP !!
[ Este mensaje fue editado por: Ferdie on 30-05-2005 14:25 ]
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jfornech
Registered to :
17-03-2005
From France
Messages : 39
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| Posted 31-05-2005 at 14:07
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How it is possible ?
What type of alimentation do you use ? (PC alim or other type ?)
Can you tell me how voltage do you have at the PCB digit display between the 8 pins connector and the other pins contector ?
I am really disappointed ?
JFO
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