This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a company 567 which is still a common component.
March 2017 - Texas Instruments LM5166 Synchronized Buck Converters are available at Mouser for 3V...
This circuit is from 70's documentation. The converter used is not a common component today. |...
It can be obtained from Mouser Electronics new crystals for surface mounting from AVX with...