This circuit is recommended for alarm systems since it has a good output stage. The circuit is from a Radio Electronics magazine from October 1992.
November 2016 - Already available from Mouser Electronics on Texas Instruments' new DS280BR820...
This circuit found in a 1988 documentation consists of a timer or sequential timer controller. The...
This astable multivibrator has an emitter coupling between the transistors. The circuit is from...