We found this micro amplifier in a technical documentation from National Semiconductor. The circuit can be used on an experimental phone, being powered even by alternative power sources.
The configuration shown in the figure uses two NPN transistors activating the load when the input...
This circuit was found in American documentation from the 1980s. Its purpose is to use a 170 MHz...
This circuit protects galvanometers that are excited by low impedance amplifiers. The circuit is...