Using the LM383 this circuit was found in a Popular Electronics from the 90s. The source must be 14V and the integrated circuits must have good heat sinks.
This circuit detects the presence of a pilot flame in heating systems by the presence of infrared...
This circuit of 1965 documentation makes use of a tunnel diode to retard a pulse without...
This Japanese transistor radio was manufactured in the 1960s in Japan. The circuit of 6...