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.
This circuit was found in Electronics Now magazine and can be applied to any JFET. The circuit has high...
This circuit is from a 1977 National Semiconductor integrated circuits manual. The circuit admits...
This is a commercial radio circuit for 1967 AM. It was found in Japanese documentation. The...