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AVCC 2.1 - module update

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Lazybutt

Member
Joined 2009
glt said:
I've seen photos where the leds have different brightness (including mine). Although that is not an issue, is the new design better at having equal brightness?
Click to expand...

That's quite strange..... from what I understand of the circuit design (if the LEDs are the same of course) , you should not be able to see the difference. The current through both should be close enough that you should not be able to distinguish a brightness difference....
It happened to me and I found it was when the Shunt Power supply to the Buffalo board was under powered (too low CCS setting..).. you should check that you are shunting enough current in your Placid if that's what you use...
 
Russ White

Russ White

Member
Joined 2005
twistedpearaudio.com
Lazybutt said:
Hi Russ,
I'm sure the question has already been asked, but why does the AVCC need to share the voltage reference..? in other words, why can't Tridents be used in place of the AVCC module ?
Click to expand...

You can absolutely use two trident's but the left and right output will then not be as exactly matched, and any variation will not be present on both sides at the same time. This can have an adverse effect on stereo imaging.
 
G

glt

Member
Joined 2004
diyaudio.com/forums/showthread.php?s=&threadid=140669
Lazybutt said:
That's quite strange..... from what I understand of the circuit design (if the LEDs are the same of course) , you should not be able to see the difference. The current through both should be close enough that you should not be able to distinguish a brightness difference....
It happened to me and I found it was when the Shunt Power supply to the Buffalo board was under powered (too low CCS setting..).. you should check that you are shunting enough current in your Placid if that's what you use...
Click to expand...

Thanks for the tip. Will check.
 
H

hochopeper

Member
Joined 2009
glt said:
I've seen photos where the leds have different brightness (including mine). Although that is not an issue, is the new design better at having equal brightness?
Click to expand...

I always thought that was caused by different exposure times/ambient lighting. I don't think photos are a great way to judge LED brightness ...

OR are you talking about the 2 leds on the same module? IE 2 leds in the same photo?
 
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