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, which can act as a shield, was found in a 1969 documentation. The circuit uses...
This oscillator can generate signals from 100 kHz to more than 50 MHz depending on the crystal used...
This simple multivibrator circuit generates a 1 kHz signal rich in harmonics. The circuit is from...