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David Ashton
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Re: my first
David Ashton   10/16/2013 5:04:03 AM
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BTW...love your Lissajous TV idea....must have been awesome...

David Ashton
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Re: my first
David Ashton   10/16/2013 4:59:22 AM
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@Glen....Gudoldaze and Round Tuits....now you've got me reminiscing.  I built a colour organ from a Practical Electronics article.  It had 3 9V-240V transformers with the 9V windings across the speaker outputs and the 240V windings driving SCRs which drove the lights.  One 240V winding had a cap across it, and one a cap in series to do the frequency selection.  It had a 20R pot in series with the speaker connection as an intensity control.   Hideously crude, but it worked.  I hate to think what it did to the speaker impedance presented to the amp.....and I think it needed a couple of watts to drive it.  I had it in my junk store, meaning to redesign it, for years but got rid of it when I left ZImbabwe.  Probably just as well, I certainly don't have time now....

zeeglen
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Re: my first
zeeglen   10/15/2013 10:23:55 PM
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Never had a color organ, instead used a defunct small TV (with CRT still working) with an additional yoke (deflection coil assembly) driven from a pair of 6L6 in pushpull, the vertical winding through a few tens of uF for bass phase shift.  The resulting Lissajous figures, when projected onto a wall through a 4" magnifying glass, were truly mesmerizing. The harmonics of Black Sabbath created some really interesting Lissajous figures with curls in the corners of rectangles; my buddies would sit transfixed for hours staring at the pulsating patterns projected onto the  wall.  Always wanted to do the same thing with a color TV, but never got a round tuit.

Ahhh, the gudoldaze...

Caleb Kraft
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my first
Caleb Kraft   10/15/2013 4:21:59 PM
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I'm pretty sure my first electronics project was a color organ kit. I was probably 9 years old. Thought it was freaking AMAZING.

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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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