In the figure we have a stereo decoder from the 70's with pilot lamp for signal indication. The circuit employs a component of the time, which is uncommon today.
This circuit is from a Popular Electronics from the 90's. It can be implemented with equivalent...
Found in American documentation from the 1980s, this circuit makes use of components that...
This stereo circuit with the 2002 integrated circuit. The power is 6 W per channel with 16 V of...