This filter is from the Linear Applications Handbook of the National Semiconductor of 1994. However, it can be used with other operational and modified to operate with other frequencies.
Other operational amplifiers of the same the series, such as the MC34072, MC34074, MC35071,...
This circuit is from documentation from 1965. However, it can be created with modern transistors. Power...
This two-transistor delay circuit from the 1960s was found in documentation from the time....