This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very common today. The power supply must be symmetrical.
of the National Semiconductor of 1994. The same technique can be used with other operators and the...
This several short-wave bands receiver, according to the chosen values of the components, was found in...
Found in an American publication in 1967, this circuit makes use of an integrated circuit of the time,...