This circuit was found in a 90s Popular Electronics. It also serves for the analysis of microcontroller signals. The power comes from the circuit under test.
This circuit uses an optical coupler to indicate a phone call through a lamp. The circuit is from...
The LM320 is a negative voltage regulator up to 15 V with maximum current of 1 A. In this circuit we...
This circuit was obtained in a 1986 documentation consisting of an active frequency divider for...