Second order active voice filter (CB7568E)

This filter for the 300 Hz to 3 kHz range was found in an American documentation from the 90's. The operational amplifier is a double 741.

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Biestable Photo Automation (CB13175E)
In the circuit in the figure, when a pulse of light falls on the LDR, the circuit arms with the...
5 to 12V Voltage Regulator (CB19001E)
This switched or switched regulator was suggested by Texas Instruments in one of its application manuals....
Symmetric Power Supply using Transistors (CB12665E)
Using transistorized regulators with NPN and PNP transistors we can create a symmetrical source of...