The cut-off frequency of the circuit shown in the figure is 750 Hz, with the components used. The circuit applies to almost any operational amplifier and the power supply must be symmetrical.
Using two of the 4 NAND gates of the integrated 4001, the circuit in the figure activates the...
This traditional 3-channel mixer configuration with FET appears elsewhere on this site. The FET...
This circuit was obtained in an old American manual. The circuit is valid for any operational. The...