This conventional relay light detector circuit uses a 741 as a voltage comparator. The sensitivity adjustment is made in R1. The supply voltage depends on the relay used.
We found this circuit in a 1964 publication. The circuit is both an amplifier and an oscillator for the...
This circuit was obtained from the 2005 manual of Linear Technology LT1306. The formulas for...
This is a traditional complementary configuration that provides good audio power with excellent...