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.
Two potentiometers mounted at right angles, so that they can be operated by a lever, form a very...
The integrated circuit and configuration are uncommon. However, the sound quality is good. The...
Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control...