Found in Popular Elecronics, this configuration also appears in this section, but obtained from other sources. The 14.4 V supply allows the circuit to be used in the car.
This circuit is from an old 80's linear circuit manual. The configuration can be implemented with modern...
This detector with ultra-low deviation was found in an American documentation from the 90s....
This circuit was found in a Signetics documentation from the 1980s. Next to the figure are the...