Found in a 90s Maxim documentation, this circuit disconnects the battery in case of overload. The components used are from that time.
We found this circuit in an 80's Radio Electronics. It can still be easily assembled as the used...
This preamplifier for the phonographic capsule was obtained in an Argentine publication from 1973....
The circuit shown in the figure below is suggested by ON Semiconductor (www.onsemi.com), based on...