Found in American documentation from the 1990s, this circuit uses coils with multiple outlets to get the best reception, the diode is a general-purpose crystal diode.
This circuit was obtained from Radio Electronics from the 90s. The infrared sensor is of an...
The sensor in this circuit is a common transistor like the BC548. The circuit is from a 1979...
Although the UAA170 is not a common component today, the circuit shows how it can be used in a...