Suggested by General Electric in a 1980s publication, this circuit is intended for coupling alternating signals, with the transistor being polarized in its linear region.
This receiver for infrared remote control was found in the Philips Databook of 1990, The circuit...
Found in an English publication from the 1980s, this circuit uses components that are still common...
This circuit was found in Maxim's documentation from the 90's. The frequency of the circuit is...