Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components without values determine the frequency to which the circuit is tuned.
In the figure we have a good rectangular signals generator with several frequency bands. The...
This interesting circuit was obtained from a Poptronics of February 2001. The American magazine no...
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...