"Tom" wrote in message
...
Hello

If anyone can recommend me a good book from which i will learn to
construct
oscillator that for example covers range 0-12 MHz.

A DDS chip like the Analog Devices AD9850 will give you something close to
that. It won't quite go down to 0 MHz, though. You could just switch it off,
of course.

Leon
--
Leon Heller, G1HSM

http://www.geocities.com/leon_heller