This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
In the figure we have a different configuration for an oscillator with the 555. This circuit was...
This short-range transmitter has the frequency determined by the crystal. The frequency can be...
This very simple amplifier was found in the Philips Databook of 1990. The circuit is suitable for...