We found this circuit in a 90s Radio Electronics. The integrated circuit used is uncommon today. The table indicates the components for different operating ranges.
This circuit for experimental radios and other applications is from a documentation from the 50's....
This circuit was found in a Popular Electronics from the 90s. The circuit uses general purpose...
This 20 Hz high-pass filter was obtained in a 1965 American publication. The operational amplifier must...