The circuit presented was suggested by National Semiconductor in its Linear Applications Handbook. The circuit also applies to other 3-terminal regulators.
This metronome configuration with the 555, quite common was found in a 90s Hands On Electronics. The...
We found this circuit in a 1964 Electronic Design. Transistors can be modern general-purpose...
As monostable we have a proximity switch that can be used as a shield, since the capacitance of...