The components of this circuit are still common today. The circuit is from a 1967 publication by General Electric.
This filter was found in Texas Instruments documentation from the 1980s. The circuit uses a common...
Other series operationals such as the LM258, LM358 and LM2904 can be used on this circuit of the...
This circuit was found in Japanese documentation from the 1960s. It is a commercial circuit with...