Found in a Linear Technology documentation from the 90s, this circuit dissipates 1.5 W with an output of 3.3 V x 2 A. The integrated circuit used is from the time.
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....