This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
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...