This circuit was found in the August 1994 issue of Electronics Now magazine. The 4046 is uncommon these days and the frequency range is given by C1.
May 2016 - It can be obtained from Mouser Electronics new microcontrollers from Texas MSP430...
Maxim MAX16813B 4 Channel LED Driver These Maxim Integrated LED drivers are available from Mouser...
This two-transistor amplifier stage has a feedback network allowing a voltage gain between 10 and...