Using operational amplifiers of the time, we found this circuit in documentation from the 90s. The configuration can be adapted to use modern operational amplifiers.
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...