The circuit in the figure is an amplifier with gain 10 for alternating signals using the 741. The circuit is from an article in the Radio Electroics magazine of May 1989.
This sensor circuit for currents of the order of nanoamperes was found in an American...
This circuit was obtained from a 1964 magazine and has some interesting features such as the input...
Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an...