This circuit was found in the April 1978 Radio Electronics magazine. The power supply must be symmetrical, and the maximum operating frequency is around 100MHz.
This two-door doorbell was found in a 1990s US publication. The circuit is still current as...
Suggested by Intersil in documentation from the 90's, this circuit is valid for modern operating...
We found this circuit in an old RF documentation. The circuit must employ RF transistors and the...