This balance indicator for stereo amplifiers was found in an 80's Elektor. The components used are common. Zeners are 1.8 V or close to that value.
This variable gain circuit for analog video signals was found in a 90s Linear Technology...
In the figure we show how to connect a power MOSFET to the output of a CMOS function to control a power...
This receiver using a FET appeared in a November 1957 Radio Electronics magazine. It is one of the...