This circuit can detect static charges or extremely low voltages. The circuit was found in ancient American documentation and makes use of a JFET. A BF245 which is a more modern transistor can be used.
This circuit was found in an old publication about transistor. The original trasistors are...
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....
This circuit allows the recovery of tapes with the passage of this media to the computer and other...