Suggested by Linear Technology in documentation from the 90s, this circuit uses a company component available at the time. See if there are current equivalents.
In this circuit, from a 1977 FET documentation, the FET can be BF245 or MPF102. The circuit...
This circuit allows to activate three functions in a controlled way, determined by a diode array....
This circuit, found in an old magazine of the year 1968, uses a Power germanium transistor. This...