This receiver was found in a 1924 book by Gernsback. The circuit uses three tubes and is powered by 3 batteries of different voltages, common at the time.
The high sensitivity of this type of SCR recommended in our assemblies allows it to be triggered by low...
The circuit shown is from National Semiconductor's Linear Applications Handbook. It makes use of...
September 2016 - It can be obtained from Mouser Electronics the new integrated circuit µCC21520...