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Frankenstein's Fix: Troublesome Psychedelics

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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.

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...

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....

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...

kfield
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Re: my first
kfield   10/16/2013 10:10:34 AM
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@zeeglen Glen, I just gotta ask: Were you also into tie-dyed fashion?

Max The Magnificent
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Re: my first
Max The Magnificent   10/16/2013 4:27:53 PM
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@kfield: Were you also into tie-dyed fashion?

You make it sound like tie-dye has gone out of fashion!

Caleb Kraft
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Re: my first
Caleb Kraft   10/16/2013 4:40:36 PM
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Man, that sounds really cool. I'd love to see this contraption!

David Ashton
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Re: my first
David Ashton   10/16/2013 5:53:00 PM
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@Glen, Caleb I was just thinking that these day's you'd use lasers and mirror galvanometers or something similar to do that.  Then I remembered I rescued some bar code readers from the trash not long ago.  They have a laser in and some kind of deflection mechanism for the scan.   I just have to get the other 10 000 things done that I need to do, then I'll look at doing something with that.,,,,

David Ashton
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Re: my first
David Ashton   10/16/2013 5:53:24 PM
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@Glen, Caleb I was just thinking that these day's you'd use lasers and mirror galvanometers or something similar to do that.  Then I remembered I rescued some bar code readers from the trash not long ago.  They have a laser in and some kind of deflection mechanism for the scan.   I just have to get the other 10 000 things done that I need to do, then I'll look at doing something with that.,,,,

Caleb Kraft
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Re: my first
Caleb Kraft   10/16/2013 5:54:55 PM
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Yep fairly common for people to tape tiny mirrors to their speakers for some home made light effects. 

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