Found in American documentation from the 1990s, this circuit uses coils with multiple outlets to get the best reception, the diode is a general-purpose crystal diode.
The Texas TL783 integrated circuit is a three-terminal high voltage regulator with a wide range of...
This circuit was obtained from ancient American documentation. The operational is from the time...
Found in Popular Electronics' 90s, this small megaphone is based on LM386. The circuit uses a high...