Taking an example of a Raytheon operative as uncommon today, the circuit applies to other operational amplifiers. The formulas are given next to the diagram.
This egg timer has been found in an English magazine that no longer exists in 1982. The...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
Found in Popular Electronics from the 1980s, this circuit uses two operational amplifiers from...