The circuit shown is from National Semiconductor, having been found in the 1994 Linear Application Handbook. Rt and Ct determine the output frequency.
November 2016 - Already available from Mouser Electronics on Texas Instruments' new DS280BR820...
This circuit generates a pulsed tone whose frequency depends on C2 and whose flashing depends on...
The presented circuit is suggested by National Semicondictor in its 1994 Linear Applications...