Pulse generator with delay 555 (CB8922E)

We found this circuit in a Hands On Electronics from the 90s. The delay is given by the formulas next to the diagram.

Flasher (CB16407E)
This circuit was obtained in a 1980 publication and was suggested for balls, parties, vehicles...
Light Control 78xx (CB13052E)
In the figure we show a circuit in which the output voltage of a 78XX voltage regulator is...
Automatic start for LASER (CB7226E)
This circuit, of a Popular Electronics of 1969 is destined to firing a gas LASER of the time. The...