Nick Flowers Posted April 24, 2016 Report Share Posted April 24, 2016 Well, I found this interesting! Maybe one or two others out there will too. http://www.douglas-self.com/MUSEUM/POWER/mechrect/mechrect.htm Quote Link to comment Share on other sites More sharing options...
soundtrane Posted April 24, 2016 Report Share Posted April 24, 2016 amazing... Quote Link to comment Share on other sites More sharing options...
Jay Rose Posted April 24, 2016 Report Share Posted April 24, 2016 There was also a mechanical "CCD" delay device for reverb in early electronic organs. As I understand it, a rotating arm swept over a circular bank of contacts, connected to capacitors that slowly discharged. When a key was pressed, voltage flowed through the arm and charged the cap. When the key was released, the arm read the voltage... which slowly faded down as you moved from one cap to the next. I'd seen a description of this a long time ago, but can't find the reference any more, so I'm not sure of the operation. Or why the organ company chose this instead of a variable RC circuit. It's possible (though highly doubtful) that the arm swept quickly enough to preserve waveforms instead of envelopes. Quote Link to comment Share on other sites More sharing options...
Nick Flowers Posted April 25, 2016 Author Report Share Posted April 25, 2016 I love all this old stuff - here is an example of a mercury arc rectifier. Quote Link to comment Share on other sites More sharing options...
Nick Flowers Posted April 29, 2016 Author Report Share Posted April 29, 2016 More deep joy from the Douglas Self site. http://www.douglas-self.com/MUSEUM/POWER/vibratory/vibrate.htm#eric Quote Link to comment Share on other sites More sharing options...
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