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 is in the SGS manual of linear integrated circuits of 1982. The integrated circuit is of...
This circuit sends its signals to short wave receivers and even FM outside stations placed nearby. As...
This simple VU (Volume Units) or volume indicator for amplifiers was obtained in an English...