3 A switched regulator (CB8859E)

Found in a 90s Popular Electronics, this circuit provides a current of 3 to 5 A depending on the transistor.

General purpose RF detector (CB8484E)
Found in a 90s English documentation, this circuit consists of an RF detector for testing in RF...
Shutdown for exhausted battery (CB8387S)
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...
Audible warning (CB9204E)
This circuit that generates a special sound was found in a Popular Electronics from the 90s. The...