This circuit, which can be used as a shield or in other applications, can be found elsewhere on this website. The supply must be made with 5 V.
Found in American documentation from the 1970s, this circuit employs an integrated circuit from...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This assembly circuit using a small motor as a generator was found in Radio Electroics magazine from...