This circuit is from a Radio Electronics from February 1959. The circuit has a speaker output and good sensitivity. Power is supplied from a 9 V battery.
In fact, this 1992 circuit consists of a demonstration circuit of a 5-channel remote control that...
Mouser has a huge list of sensors for the most diverse applications such as automation, IoT,...
Many still like to hear medium waves but live in places with difficult reception with many...