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.
We found this circuit in the July 1969 Radio Electronics magazine. The circuit uses a coupler made...
This circuit was found in a 1994 publication. Its purpose is to time the operation of a welder (or other...
Found in a Popular Electronics from the 90s, this circuit is suitable for communication between rider...