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 LED indicator circuit uses an LM339 comparator. The circuit was found in the January 1995...
This version is one of many that can be found on our website. We found it in Radio Electronics from the...
Found in a 2005 Linear Technology application manual, this circuit provides outputs from a current...