This circuit uses an LDR as a sensor to trigger an LED indicator at a preset lighting level. The power supply does not have to be symmetrical.
This step of good gain was obtained in an American publication of the 1980s. The circuit can be...
This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine....
We found this circuit in an Australian documentation from 1991. The circuit is suitable for SMD...