SSB

[R.Fahl]

>I just purchased 4 AD633 (Low cost analog multiplier) from Newark
>Electronics for something like $6 each.  (I find Newark good for finding
>hard-to-find chips but you gotta pay big.)  I got the data sheets with
>application data from AD's web site.  The chips are well integrated and
>simple to use.  The offset nulling circuit is a simple resistor/divider
>type with a pot.  I haven't used them yet but I think 2% max error could
>be no big deal for musical applications.
>
>I wonder how a 2% multiplier error translates into the output (ideal vs.
>actual) for the freq shifter?
>

http://hyperreal.org/machines/categories/do-it-yourself/schematics/

There's a simple schematic and a textfile from Chris List showing how he
set his 633s up for a ring modulator.

R>

 "One aspect shared by early analog synths was the instability of certain
components, most obviously demonstrated by pitch drift in the oscillators.
Some synths were more stable than others. The question was, what did the
manufacturer consider a tolerable amount of pitch drift? 'We felt that it
was more important for the Buchla synth to have lots of things that were
slightly less stable than to have it be so expensive you could only afford
a few modules,' says Subotnick. 'As I recall, the determination of how long
the oscillators would stay in tune was how long a violin stayed in tune in
a concert. I figured if you had to retune a violin halfway through, why not
an oscillator?'