This filter was found in a Texas Instruments manual based on an operational amplifier 741. Other operational can be used and, with the indicated components, the rejection frequency is 2 kHz.
This circuit was found in old documentation and can be implemented with other operational...
This circuit was found in the December 1984 issue of Radio Electronics magazine. The circuit has a...
This Testa o Croce (name in Italian) was obtained from an Italian magazine in 1994. The circuit can...