This circuit was found in a 1969 US documentation. It provides a signal that can be externally programmed as suggested circuits. The circuit can be used as a shield.
This high gain small signal amplifier circuit was found in an old publication on transistors....
This circuit suggested by Motorola can be used as LED high frequency modulator. One possible...
This circuit is from an old publication of the 70's. It can be implemented with modern transistors like the...