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zeeglen
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Re: Why so complex?
zeeglen   11/13/2013 9:38:46 AM
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Other possibles could be large hysteresis or non-retriggerable monostable.  Many ways to skin unwanted noise.

Caleb Kraft
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Re: clarity
Caleb Kraft   11/13/2013 9:31:50 AM
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We even have surprise runner up prizes!... shhhh, don't tell anyone, its a surprise. 

gigavolt
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Re: clarity
gigavolt   11/13/2013 9:29:33 AM
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Awesome! I will be there if I'm not traveling that day.

Caleb Kraft
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Re: clarity
Caleb Kraft   11/13/2013 9:19:02 AM
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Sorry for the delay and the poor communication on that. We're going to annouce the winners in a live chat on friday! If you can't make it, we'll also publish the winners after the chat.

gigavolt
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Re: clarity
gigavolt   11/13/2013 8:59:30 AM
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Agreed. A little late now I suppse...I didn't discover that my artice had been published until yesterday after I tried to find out who won. Who won btw?

David Ashton
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Re: clarity
David Ashton   11/13/2013 4:35:40 AM
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@gigavolt (and Andy) - point taken, and very valid.   But a more polite request direct to Caleb would probably have got a better result - space in the columns is limited, but they can put click links to bigger versions of images.....

 

gigavolt
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Re: A tuned filter?
gigavolt   11/12/2013 9:56:48 PM
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THe machine;s been running for over a year now, WKetel. And no failures yet. I would think it's pretty reliable. I agree a filter would be best, but I could find none that would work. And when you're faced with "make it work or I want my money back", you do what you got to do to make the customer happy.

gigavolt
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Re: Why so complex?
gigavolt   11/12/2013 9:53:11 PM
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These comments were the first thing I thought of as well. There was a lot of stuff I couldn't get into because of the word limit. But long story short, I tried various filtering techniques, but none would work. The schematic here is really unreadable, but I posted a link to the original article in a comment above. There, you can see the schematic and other images with better resolution. You will see that there are two opto-couplers converting the line frequency to a digital signal. One is the "phase", which outputs a 60 Hz 50% duty signal. The other is "ISR" which outputs a 120Hz 10% duty. I was able to clean the 50% with a .01 to ground. But when I tried that on the 10%, the computer wouldn't start. Everything I did to the ISR signal caused a boot failure. I'm not really sure why. Replacing the signal was the only alternative left.

gigavolt
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Re: Why so complex?
gigavolt   11/12/2013 9:47:22 PM
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On the A/C side? No. They tired that long before I was called in.

gigavolt
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Re: clarity
gigavolt   11/12/2013 9:40:19 PM
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I think Andy might be talking about the formatting of the article done by EEtimes, and not the author, which is me. The text has clearly been revised, and very well I think. The problem lies in the resolution of the images. You can not make out the text in the scope images at all, and the schematic is unreadable as well. It's also difficult to take in how bad the signals really were with these low resolution images. They really make the article somewhat nonsensical due to lack of information.

The URL below is the article as I originally wrote it, and much more readable.

http://www.24hourbudget.com/contest/

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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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