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.
Three of the four gates found in a 4001 can be used to perform as an AND gate. This improvisation...
This circuit was taken from the 1960's Mullard Transistor Manual. Information about the coils is...
This circuit from July 1975 Radio Electronics uses any operating system with a symmetrical source....