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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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