[sdiy] an old serge UI secret and a primordial question

[John Mahoney]

At 06:57 AM 4/18/2007, Anthony Bisset wrote:

>...  So, having 2 outputs makes
>sense for a live performance system.

Or, you can make sure that the plug that will need to be removed is 
plugged in last, so that you can remove it without disturbing the others.


>...  90 degress seems optimal, so just an opamp would do the trick,

Well, a 180 degree phase change (actually polarity inversion) is 
trivial with one op amp. 90 degrees is not quite so trivial, as far as I know.

Phase shifters ("phasers") use a number of all pass filters to, uh, 
shift the phase. So I guess I'm saying that you should study some 
phase shifters. (Ray Wilson and others sell phaser PC boards, maybe 
you could modify one for your purposes.)

Also, check out the IBP Analog Phase Alignment Tool (and Junior) from 
Little Labs:
         http://www.littlelabs.com/ibp.html
         http://www.littlelabs.com/ibpjr.html
--
john


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