In the figure we have the way to obtain 500 gain from a FET. FETs can be BF245 or MPF102. The circuit is from the 1977 National Semiconductor FET Data Book. Power supply depends on the application.
This circuit consists of a control panel for motorcycles and cars monitoring various functions such as...
Found in an American 80's documentation, this circuit can use common FETs like the BF245 and cover...
The integrated circuit used in this project is an old voltage comparator, since the configuration was...