This is the 1968 MR480 commercial cassette recorder circuit. The circuit was fully transistorized and powered by 4 large batteries. We found the diagram in a Japanese documentation of the time.
This is a Japanese commercial circuit found in a 1967 documentation. The transistors are from the...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This control of DC motors for currents up to about 200 mA was obtained in an American publication of...