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Greg.Brent
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re: What light through yonder window breaks?
Greg.Brent   4/8/2013 2:25:04 PM
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My p&p uses polyethylene for an LED diffuser on its vision system.

Max The Magnificent
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re: What light through yonder window breaks?
Max The Magnificent   2/13/2013 5:43:25 PM
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You are correct -- mine each have a bunch of contacts -- some of them are "switch to make" and others are "switch to break" -- plus one of the switches works as a momentary switch if you press it down (when you release it it returns to the center position) and toggle if you switch it up. They are very, VERY tasty!

David Ashton
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re: What light through yonder window breaks?
David Ashton   2/13/2013 8:52:49 AM
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The nice thing about these keys was that you could get 6, 8 or even more sets of contacts on a key. The most you can easily get with today's toggle switches is 4.

E-Unit
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re: What light through yonder window breaks?
E-Unit   2/13/2013 8:38:36 AM
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Your switches look like "Kellog Keys", they were standard telephone switches here in the UK until the "Ericcson Keys" came along. The BBC (Our national radio) had an AEI (I think!) built control room from the early 60's which htey ripped out in the 90's. It had hundreds of these, some of which were never even used. I think they were replaced by the flimsier Ericcsons shortly after. For Lamps, you can drive bulbs or LEDs from the old ULN200* family ("ULN2003" suits TTL) which will take PWM etc. And yes, bulbs will integrate the pulses mech better than LED's, especially for migraine sufferers!

Max The Magnificent
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re: What light through yonder window breaks?
Max The Magnificent   2/11/2013 11:11:03 PM
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LOL

Max The Magnificent
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re: What light through yonder window breaks?
Max The Magnificent   2/11/2013 11:10:13 PM
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I think it's called a "Useless Machine" ... I have one sitting here on my desk

David Ashton
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re: What light through yonder window breaks?
David Ashton   2/11/2013 11:05:28 PM
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Lamps (because of their coiled filaments) are a bit inductive, so if you PWM them at a very high frequency you just might get strange things happening. But anything in the KHz region shouldn't worry them. They are after all usually fed with 50/60 Hz...anything above that you shouldn't get any flicker. I once used an auto bulb as an RF dummy load. At 40 MHZ it was quite good, but at 80 MHz it needed a trimmer cap across it to null out the inductance. Cheaper than buying s proper load.

ndancer01
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re: What light through yonder window breaks?
ndancer01   2/11/2013 10:30:53 PM
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When I was at Boeing, there was a rumor going around that there was a box for the uninitiated. It was welded metal and had one button--and a sign that said, "Do not press this button." It generally sat there for less than half an hour before somebody pressed it. Contents? A battery, a latching relay, and a klaxon. In that metal box, it was loud. I was told that more than one went into the Duwamish River (which ran close to the plant).

ndancer01
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re: What light through yonder window breaks?
ndancer01   2/11/2013 10:25:08 PM
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I believe it was invented by Claude Shannon

ndancer01
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re: What light through yonder window breaks?
ndancer01   2/11/2013 10:23:23 PM
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The ultimate machine, of course, is something about the size and shape of a cigar box with one switch on the front. When you throw the switch, there's an angry buzzing inside, and a few seconds later, this mannequin hand 'ratchets' out, and turns off the switch. Then the hand pops back inside, the lid closes, and the buzzing stops. This is the ultimate machine--almost human. The only thing it does, is turn itself off.

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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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