This setting applies to virtually any photo transistor and any operational amplifier. The power supply must be symmetrical, and the gain is determined by the relationship between R2 and R1.
This circuit from an old documentation (1970s) combines the function of cutting or limiting the...
This circuit can be used to show the direction of current flow in semiconductors, such as LEDs....
This circuit activates a relay when the sensor receives light indicating dawn. A relay with a 4k7...