We found this circuit in a Linear Technology documentation from the 80's. It has a demodulator, being suitable for links and remote controls. Note the unusual type of detector configuration.
This conventional power supply circuit with the LM317 was found in a 1987 publication and its...
This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering...
This detector is from the 1990 Motorola Dataar Databook, but can be adapted to work with more...