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.
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This circuit was found in a Popular Electronics from the 90s. The circuit uses general purpose...
This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The...