This filter was found in a Texas Instruments manual based on an operational amplifier 741. Other operational can be used and, with the indicated components, the rejection frequency is 2 kHz.
This circuit can turn-on (only) a load (relay or lamp) when S1 is pressed. The circuit can be used as...
This circuit was found in a 90s Electronic Design. The integrated circuits are from that time....
Found in the May 1997 issue of Electronics Now, this circuit produces a variety of sound effects for...