This circuit also detects IR, providing LED indication. The circuit is used to indicate humidity in bench tests. We found it in the Radio Electronics magazine of February 1990.
-- This old oscillator takes advantage of a transistor radio output transformer of the time. The 2...
November 2016 - Already available from Mouser Electronics on Texas Instruments' new DS280BR820...
This RS flip-flop uses two type 4N26 optical couplers and is characterized by the very high...