Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The circuit is CMOS using an integrated 4011.
Indicated by Texas Instruments, this 1968 circuit measures the duration of a light pulse captured...
This circuit produces a 2 kHz tone on a standard piezoelectric transducer. The circuit can be used as...
This simple calibration circuit consists of a crystal oscillator that generates an accurate 100 kHz...