This circuit keeps the neon lamp on for a moment when it receives a pulse. The turn on time depends on C. The transistor is of the old type, from the 60's, when the circuit was published.
Indicated by Texas Instruments, this 1968 circuit measures the duration of a light pulse captured...
We found this circuit in an old English documentation. The integrated circuit is of a specific type of...
We found this circuit in a 1975 publication. The circuit can be made with more modern equivalent...