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Author Topic: Where can I find a 1.0mm pitch QFP adapter for a 52pin ic?  (Read 1953 times)
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TECH GEEK
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« Reply #60 on: November 18, 2011, 12:35:32 am »
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No I did not add them...
Also what is the purpose of ground planes?
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« Reply #61 on: November 18, 2011, 12:39:44 am »
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Helps keep EMI noise down, may help with cooling.
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« Reply #62 on: November 18, 2011, 12:40:14 am »
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Quote from: CrossRoads on November 18, 2011, 12:32:05 am
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?
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« Reply #63 on: November 18, 2011, 11:25:01 am »
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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!
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17

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« Reply #64 on: November 18, 2011, 11:35:35 am »
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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?
 
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« Reply #65 on: November 18, 2011, 03:59:34 pm »
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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.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17

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