MB-6582 LED Matrix issue

[nILS]

Radiohm:

470k lin: http://www.reichelt.de/?;ARTICLE=13877

470k log: http://www.reichelt.de/?;ARTICLE=13889

ALPS:

500k lin: http://www.reichelt.de/?;ARTICLE=73830

500k log: http://www.reichelt.de/?;ARTICLE=73837

[Wilba]

They look too big.

Rear panel hole spacing is 1.2" = 30.48mm

But the real limit is the proximity to the stereo jacks beneath them, and the control surface PCB from above.

I know the 16mm ones work, only if you cut the leads  ;)

[Smithy]

From previous testing I know the LEDS are functioning. My meter in continuity mode presents a led friendly current. I am able to light each LED individually from the main PCB points, and CS PCB points.

I just finished soldering the LEDs and encoders, and was looking for a way of testing them.

I never the current from a continuity tester would be strong enough to light an LED,

it works like a charm.

In the CS Construction Guide, it says to test the Power LED with a resistor value, in order to determine what value resistors you should use for LEDs on the PCB.

Since there are more LEDs on the CS per resistor, wont the brightness differ to the brighness from the Power LED?

[nILS]

I never the current from a continuity tester would be strong enough to light an LED

I think you a word in that sentence.

[Wilba]

Since there are more LEDs on the CS per resistor, wont the brightness differ to the brighness from the Power LED?

You are sort of correct. One resistor does connect to the anodes of multiple LEDs, but only one cathode will be sinking the current at any given time. So yes, the brightness of a single LED in a LED matrix is slightly less than powering it separately with 5V and a given resistor. But it's not much different. For red LEDs, test it with 1K, if it is not too bright or dull, then it will be OK. The default 220 ohm wouldn't be too bad. It's only an issue with ultrabright LEDs... 220 ohm for these would be too much, you really need more than 1K, but it's hard to say what is best without experimenting.