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.
For signals up to about 500 kHz modulated in amplitude and transmitted by the power network, the...
This circuit, found in a 1995 documentation, is intended for switching composite RGB video signals...
This low drift or offset circuit is from an 80's documentation. The configuration can be made with...