This 100 Hz filter was found in the August 1993 issue of Electronics Now. The components can be modified to operate at other frequencies.
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...