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 transistor source has the output voltage selected by zeners and the LED indication of which...
This filter can use almost any common operational amplifier and needs a symmetrical power source. The...
This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V...