This interesting circuit was found in an 80's Electronic Engineering. The circuit has a 50% active cycle. R and C determine the generated frequency.
This circuit, from an old publication, can also use modern transistors. Note that the unit is...
This small short-range FM transmitter was found in a 1987 documentation. It is intended for the...
This circuit is used as a magnetic field sensor and is based on a Texas Instruments HaII Effect...