On Tuesday 03 April 2007 02:05, Ramakrishnan Muthukrishnan wrote: > On 3/31/07, al davis <[EMAIL PROTECTED]> wrote: > > How about lab test equipment. There is a real need for > > simple stuff that is too simple to market at the high > > prices the big instrument companies need to charge. The > > kind of equipment you need in a home lab. Like Heathkit > > used to make. > > One thing I am particularly interested in, is a bench RF > signal generator, may be not of the class of HP 8640. It > should be able to have adjustable output frequency and level > to start with. It should be easy to replicate and should use > commonly available parts like DDS, 1206 parts for instance.
If you look at the designs of older ones, you will see that they did it with 2 or 3 tubes. The basic design can be updated to use today's components, with significantly improved performance. Another one that could be useful is a "Q-meter". It is used for measuring inductors and capacitors by resonance. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user