Found in a 1967 General Electric SCR manual, this circuit can be used to protect a load by switching in case of excess current. R1 determines the trigger current.
This shield circuit uses a common CMOS port. The voltage depends on the interfaced logic. The...
This switched or switched regulator was suggested by Texas Instruments in one of its application manuals....
This is the circuit of an old oscilloscope, using components from the 80s. Of course, it serves...