We found this circuit in the May 1989 Radio Electronics magazine. The circuit can have its values changed to operate at other frequencies and the power supply must be symmetrical.
November 2016 - The Arduino Zero board, a 32-bit extension of the Arduino Uno for innovative IoT...
We found this circuit in a 1967 Electronic design. However, it can be easily implemented even...
This circuit is the version of the previous circuit with a single source. The transistors are...