This circuit was proposed by an old American documentation for listening to SSB stations. The circuit makes use of a small old radio 455 kHz IF transformer.
This circuit was found in an American publication in 1966. The circuit uses a general-purpose FET that...
This circuit from a Popular Electronics from the 90s uses a common optocoupler and a...
The selected circuit was found in the Texas Instruments optoelectronics manual. RC and C1...