This filter is from a 1977 publication. The circuit employs three 741 or other operational amplifiers. The supply must be symmetrical and the components with (*) are low tolerance.
This circuit is suggested by Texas Instruments' Linear Circuits Applications. It consists of an...
Radio Electronics magazine in November 1962 published in an article several circuits with tunnel...
This circuit generates a signal corresponding to the harmonic of the crystal used. The frequency is...