We found this circuit for receiving shortwave on a mediumwave radio in a 1986 Hobbyst Electronics PE. The circuit has the received band given by T1 which can be an FM IF.
This circuit was obtained from an old American documentation, and practically any general-purpose transistor...
This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The...
This amplifier, obtained in an Argentinian publication of the 1970s, provides a 6 W output. The...