This circuit with germanium transistors is from 1960 and was found in Mullard's transistor application manual from 1960. The circuit can be adapted to use more modern transistors.
Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can...
The circuit shown in the figure can serve as a basis for frequency meters, clocks. Stopwatches and many other...
The integrated circuit used in this project is unusual. However, we can take advantage of the...