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 generates the sound of bells. We found it in a 1977 Radio Shack publication. The...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This LC circuit oscillator was found in the July 1993 issue of Electronics Now magazine. The...