If you have the skills and can get your hands on SMD components, you can assemble this small amplifier. We found it in the Radio Electronics Experimenter special edition from 1990.
This synthesized generator circuit was found in an article in October 1980 Radio Electronics...
This circuit is from a publication in the United States in the 1980s. The basic integrated circuit...
This circuit was found in an American magazine in 1976. It doubles the frequency of TTL signals in the...