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.

Low Ripple Power Supply (CB12041E)
The output voltage of this unit is approximately 1.4 V less than that of the chosen zener. The...
Amplifier Stage (CB24637E)
Found in the April 1980 issue of Radio Electronics magazine, this stage uses transistors from the...
Key Touch Switch (CB16269E)
To control direct current loads, under voltages between 12 and 200 V, and currents up to 3 A, we...