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Max The Magnificent
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A tempting tidbid...
Max The Magnificent   5/2/2014 6:00:50 PM
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Just to give you a taste of what's to come, one of the things I want to do is run my Arduino Mega, chipKIT Max32, and all of the LEDs in the BADASS display off a common 26A 5V highly-regulated supply.

However, the Arduino Mega requires a minimum of 7V (and preferably 9V or higher) from it's external supply. Meanwhile, the chipKIT Max32 does have the ability to bypass the main regulator and feed the 5V in directly, but there is a teeny-tiny gotcha if you also have the USB cable connected to a computer at the same time.

Fortunately, my on-site techno-weenie Ivan the Terrible (author of the "All About Batteries" blogs here on EE Times) has come up with cunning solutions to all of these issues.

Watch this space...

Rcurl
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Fresnel lens maybe...?
Rcurl   5/5/2014 11:57:30 AM
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How about using a fresnel lens for a 10mm led down the center of the cup washer instead of using the frosted mylar?  Look here: http://vcclite.com/_pdf/HMC-461-10mm-fresnel-thread-lens-drawing.pdf

If that doesn't do it, then a short light pipe might work.

Max The Magnificent
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Re: Fresnel lens maybe...?
Max The Magnificent   5/5/2014 12:04:41 PM
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@rcurl: How about uaing a fresnel lens for a 10mm led down the center of the cup washer instead of using the frosted mylar?  Look here: http://vcclite.com/_pdf/HMC-461-10mm-fresnel-thread-lens-drawing.pdf

Hmmm -- these do look tasty -- I'm afraid that the ymight be just a tad too wide - -I need to get my hands on one to check it out -- I'll order one today (the other thing is the cost -- remember tha tI need 250 of these little scamps)

Max The Magnificent
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Re: Fresnel lens maybe...?
Max The Magnificent   5/5/2014 12:08:37 PM
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@Rcurl: How about using a fresnel lens...

They are $1.58 each from Digi-key -- times 250 = tears rolling down my cheeks!!!

Rcurl
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Re: Fresnel lens maybe...?
Rcurl   5/5/2014 12:19:54 PM
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@Max: They are $1.58 each from Digi-key -- times 250 = tears rolling down my cheeks!!!


There wasn't anything in your specification about cost!  I can get these for 69 cents each.  In the meanwhile I'll look for a cheaper alternative.  

If you've got some acrylic rod and a chum at a machine shop then you could get some custom made lenses.

Max The Magnificent
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Re: Fresnel lens maybe...?
Max The Magnificent   5/5/2014 12:23:19 PM
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@rcurl: There wasn't anything in your specification about cost!

That doesn't mean I intend to have everything gold-plated LOL

Max The Magnificent
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Re: Fresnel lens maybe...?
Max The Magnificent   5/5/2014 12:24:54 PM
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@rcurl: I can get these for 69 cents each.  In the meanwhile I'll look for a cheaper alternative.

I just ordered one from Digi-Key -- just to see if it fits through the brass washer (if it doesn't, then this is a non-starter anyway).

Max The Magnificent
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Re: Fresnel lens maybe...?
Max The Magnificent   5/5/2014 12:26:37 PM
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@rcurl: If you've got some acrylic rod and a chum at a machine shop then you could get some custom made lenses.

It's one thing saying to the lads "can you whip me up a single XYZ" -- but it's a different kettle of fish when you want 250 of something...

perl_geek
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Re: Fresnel lens maybe...?
perl_geek   5/5/2014 2:25:27 PM
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Two thoughts for the mass-production; 3-D printer to create multiple copies at once, or a CNC machine to mill them. (Out of a large sheet, so lots created per loading.) At least the machine wouldn't get bored.

Max The Magnificent
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Re: Fresnel lens maybe...?
Max The Magnificent   5/5/2014 2:29:58 PM
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@perl_geek: Two thoughts for the mass-production...

I'm currently exploring a variety of options. I must admit that the Fresnel lenses do look rather tasty -- but it depends on (a) how they fit in the washers and (b) if I can find a really low-cost source.

I have one on order at the moment so we can check point (a) -- depending on the result we can decide what oiur next move shoudl be.

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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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