The circuit is from Ferranti's 1974 transistor manual. Transistors are general purpose types, and the output waveform is rectangular. Components can be changed to other frequencies.
This circuit was found in a Popular Electronics from the 90s. The circuit has temperature...
Found in old American documentation, this receiver transmits signals via the power grid. We can...
This circuit is from the LM317's own manual obtained from an old documentation. The IC should be...