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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Bridged Output Operational Power Amplifier LM12 (CB14391E)
In the figure we have the way to connect two high power operational amplifiers LM12 to double the...
Solenoid Current Monitor (CB5399E)
This circuit uses the Linear Technology LT6505 and was found in a 2005 manual. The circuit is for 24 V...
Lamp Flasher LM3909N (CB4556E)
a This circuit was obtained from a 1978 Practical Wireless. It causes a low-power 1.5V lamp to...