This different circuit was patented and described in the Radio Electronics magazine of March 1958. In that section it used to present different configurations that received patents.
We can implement this filter with more modern equivalent operational amplifiers, since the LM110 is...
This circuit is from an October 1980 Radio Electronics magazine. The circuit indicates when the...
This circuit can be used as a shield when its supply is 5 V. in this case we can exchange the...