Indicated by Texas Instruments, this 1968 circuit measures the duration of a light pulse captured by a phototransistor. Equivalent phototransistors and transistors may be used.
This sensor uses a capacitive system that oscillates at 45 MHz with the empty glass tube. Its...
We found this CMOS circuit based on the PLL4046 in the December 1989 issue of Radio Electronics magazine....
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...