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Steve Manley
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Re: Oh No -- not another project!
Steve Manley   7/31/2014 12:04:51 PM
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@Max: Now, you are using regular RGB LEDs, which will involve lots of multiplexing and stuff. I've decided to go with the Adafruit NeoPixel versions of these devices. Each of these LEDs contains its own controller with current limiting resistors and three 8-bit PWM drivers (one per RGB channel).

I have taken delivery of 10 of those Adaruit NeoPixels myself but haven't gotten round to trying them out yet. A cube built with these little beauties would make the programming a little easier with no multiplexing required and no software PWM to write. The downside would be the increased current consumption due to the non multiplexing. The current for a NeoPixel cube if all led's are white could be between 20-30 amps as apposed to just under 4 amps for my cube which will be using multiplexing.

You and I still need to discuss whether or not one of the PCB's I had manufactured for my cube (another blog coming soon) would be suitable for a NeoPixel version.

Steve Manley
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Re: Brilliant!
Steve Manley   7/31/2014 11:50:39 AM
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@Max: I didn;t really understand what you were saying here until I watched your video, at which point I thought "Brilliant!" I'm really looking forward to reading your future blogs on this topic showing the techniques you used for straigntening the wire and the jigs you build to help in the assembly of this cube.

I have to agree; I could have stated this a little more clearly. For example, "I used the serrated edge from an offcut piece of Vero board as a comb to spread the led leads out."

Max The Magnificent
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Oh No -- not another project!
Max The Magnificent   7/31/2014 9:42:10 AM
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@Steve: As you know, your work on this has inspired me to build my own 8x8x8 cube (how could I live with a 4x4x4 cube knowing that you were cackling over an 8x8x8 beauty?)

Now, you are using regular RGB LEDs, which will involve lots of multiplexing and stuff. I've decided to go with the Adafruit NeoPixel versions of these devices. Each of these LEDs contains its own controller with current limiting resistors and three 8-bit PWM drivers (one per RGB channel).

I've already taken delivery of the LEDs -- I'm eagerly awaiting your future construction blogs to get ideas for the building of my own cube...

Just what I didn't need -- yet another project LOL

Max The Magnificent
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Brilliant!
Max The Magnificent   7/31/2014 9:36:10 AM
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@Steve: I used an off-cut piece of 0.1" Veroboard, spread the tips of the leads into the exposed slots of the serrated edge, and then slid the LED housing toward the Veroboard, thereby forcing the leads further apart.

I didn;t really understand what you were saying here until I watched your video, at which point I thought "Brilliant!" I'm really looking forward to reading your future blogs on this topic showing the techniques you used for straigntening the wire and the jigs you build to help in the assembly of this cube.

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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