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 audio stage can be used in siren circuits, sound effects and others to excite a few watts...
In the figure we have the way to make the connection of voltage regulators in series to obtain a...
This circuit was found in a 1967 US documentation. The FET is general purpose and the 6V zener....