Детекторный приемник с галеновым детектором.

------------------------------ Galenic detector receiver. Home-made galenical diode - an melted crystal of galen (galena) PbS as a detector was used in the first detector detectors of the 20s of the 20th century. The so-called "detector crystal" (galena has a crystal lattice). It’s not difficult to make galenite yourself. It is necessary in a test tube to fuse sawdust of lead and sulfur in a ratio of 1: 1. Such a home-made detector upon contact of the surface of a galen and a steel needle forms a semiconductor junction. In this case, the steel needle is the anode, the galena crystal is the cathode. The quality of a home-made detector depends on the place of contact, pressure, needle tip. The semiconductor junction is very unstable. But it works in a makeshift detector receiver.