This circuit is from a Radio Electronics magazine from July 1979. It uses the well-known IC 7107, a liquid crystal exciter that became popular in circuits of this type at the time.
With this converter it is possible to tune the signals of the 15 MHz WWV.in AM receiver. WWV is...
This negative voltage source was found in a Popular Electronics from the 90's. The transformer has 120V...
This circuit is from the Audio Handbook of the National Semiconductor of 1977. Its purpose is to...