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 circuit delivers at its output a voltage that proportional to the amplitude of the input...
This circuit generates signals with opposite phases determined by C1 and adjusted by R2. The...
In the diagram from the November 1999 Electronics Now magazine we have the way to improve both the...