[sdiy] outputing max of several signals

[Paul Perry]

Back in the analog computer days, one simply ran
the two signals via a diode each to the point where you
wanted the maximum.
(reverse diodes for minimum).
The thing to watch for audio, is that it is the max of the 
two voltages *relative to ground* that you are getting, so if
you are running audio in, you need some way to centre 
the signals about ground (again, if that is what you want).

paul perry melbourne australia