We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994. The circuit can be adapted to use other operational amplifiers and the power supply must be symmetrical.
This circuit uses a simple power source, having been found in the Philips Databook of 1990....
This circuit is suggested by Texas Instruments in its Linear Circuits Applications. It is a...
This circuit generates a pulsed tone whose frequency depends on C2 and whose flashing depends on...