Found in documentation from the 1990s, this circuit drives an SCR with a delay that depends on C1 and can be set to R1. The load depends on the SCR.
This circuit detects the presence of a pilot flame in heating systems by the presence of infrared...
In the figure we have a circuit that uses unusual components, being indicated for low frequency...
Found in older Signetics documentation, this circuit generates signals from 30 Hz to 25 kHz....