This circuit is from an ancient American documentation. The integrated circuit is 741 and the power supply must be symmetrical. The passing band is centered at 1 kHz.
This circuit provides signals in phase with the input and with the phase inverted. The circuit was...
This is one of the many applications of the 555. We found it in the November 1992 Radio...
The circuit presented was found in a Japanese magazine in 1973. The circuit uses transistors of...