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.
This circuit can be used as a shield for microcontrollers such as the Arduino. Frequency is given...
We found this car theft alarm circuit in a 1988 publication, but the components used can still be...
This conventional slow-moving circuit uses incandescent light bulbs, but can be changed to use...