Few month ago I've built a background noise canceller for microphones,
on a new Analog Device IC, the SSM-2216. I sent my impressions and
to this reflector and I received lots of feedbacks and many many
The good news are that a California based company named A&A Engineering
began to sell this unit as an assembled & tested unit, kit unit and by
parts. An extensive coverage of this unit can be found in the march
issue of QST,
in a W6FR article under the name of "Mike Master unit".
I'm strongly recommend this circuit to those having background noise
fans, air conditioners and so on.
73 de Morel, 4X1AD
FAQ on WWW: http://www.contesting.com/ampfaq.html
Administrative requests: amps-REQUEST@contesting.com