Found in Precision Monolithics documentation from the 90's, this circuit equalizes octave signals determined by the capacitor values according to the table next to the diagram.
Found in an old English documentation, this circuit is intended to amplify signals in the 2-meter ham...
The operational amplifier used in this circuit is a low voltage type from Texas Instruments, being...
We found this circuit in documentation from the 1980s. It drives an old cassette or roller type...