This basic CMOS 4001 circuit was found in the April 1976 issue of Radio Electronics magazine. The circuit generates rectangular signals, and the components can be changed to obtain other frequencies.
Photoelectric cells can be used as sensitive light sensors. However, the low voltage they generate...
With the illustrated circuit we can run a DC motor in one direction or the other, depending on...
In this circuit the relay triggers on when light falls onto the sensor, a common LDR. Power supply...