This circuit with two transistors was found in ancient European documentation. Transistors support equivalents. The indicator on this circuit is an ordinary 50 to 100 mA lamp.
This circuit for the logic control of the 555 in a power supply was found in the October 1989...
This circuit makes use of an uncommon TTL component today, but it can be implemented with...
In the figure we have a circuit used in stair generators with the purpose of providing constant...