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Topic: Where can I find a 1.0mm pitch QFP adapter for a 52pin ic? (Read 5725 times) previous topic - next topic

TECH GEEK

No I did not add them...
Also what is the purpose of ground planes?
As always... Thanks for posting!!!

CrossRoads

Helps keep EMI noise down, may help with cooling.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

TECH GEEK


Yes, interesting red/green LEDs, just wondering how bright they will be when multiplexed.


They are hevally diffused, and even w/ that, @ 100% duty @ 5v, one could be used as a good flashlight...

You want some pics of them on 5v0 @ 10% & 100% duty?
As always... Thanks for posting!!!

CrossRoads

Sure, post one.
I found for th 4-5,000mCD LEDs I usedm, just 2-3mA of current, even while multiplexed at 800 Hz, was really bright!
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

TECH GEEK

Also I wanted to mention this:

The 'cube' is actually wired as 8 separate bi-color LED matrices...
Each 'layer' on a single matrix has only 8 bi-color LEDs, and same can be said for the columns.

I wonder if that fact could be used to make the LEDs brighter?
As always... Thanks for posting!!!

CrossRoads

Nope - the multiplexing of the Holtek driver will be the limiting factor.

Need more LEDs with more mcd/20mA to be brighter.

Or, "overdrive" the LEDs if it can be determined the Holtek part turns on each one for the current/pulse-time allowed by the LEDs.
Be a shame to build it all up and then blow them out by accident.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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