The configuration shown allows to obtain a high voltage gain for FETs. FETs can be BF245 or MPF102. The circuit is from the 1977 National Semiconductor FET Databook.
In this circuit the LED lights up when the input voltage drops below the value set in the trimpot. The...
This circuit was obtained from a 2005 Linear Technology manual. The circuit is self-powered and can...
Damped sine oscillations can be produced when short pulses are applied to the input of this...