This is the basic configuration of an operational amplifier sample & hold circuit. The FET and transistor are commonly used. The circuit is from an 80's documentation.
This stereo preamp uses only two germanium transistors. The circuit was found in old documentation using...
This simple configuration can be found in other articles on this site. The phone used must be high...
This integrated consists of a mono amplifier for battery powered recorders and radios. The load...