Active three-tone filter (CB20808E)

This circuit was found in an American documentation and can be added to common amplifiers of any type. The transistor can be any general purpose.

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RTD Bridge with Operational (CB4393E)
The circuit shown in the figure below is from the 1993 Linear Technology Applications. The...
AND function with relay (CB19767E)
In the figure we have the way to implement the E (AND) function with two inputs, in the case of...
Power Supply and Battery Charger (CB15851E)
This circuit can be used both as a power source and as a battery charger. The resistor R1 serves as...