This circuit was obtained from a 1968 documentation and can be adapted to use current equivalent components. The maximum frequency depends on the components used.
This simulation shows how to use an operational amplifier as a voltage comparator. The sample uses the...
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
Indicated for applications with a PC, this circuit was obtained in an English publication in 1992....