This circuit has a sensitivity of 2uW. We found it in documentation from the 1980s. The integrated circuit is from that time. Equivalents can be tried.
April 2017 - Mouser Electronics is making available this new component for open LED protection...
This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine....
October 17, 2016 - Mouser Electronics, Inc. is now offering the Blue Gecko BGM113 Bluetooth®...