This circuit was obtained from a 1968 documentation and can be adapted to use current equivalent components. The maximum frequency depends on the components used.
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...