Quote Originally Posted by CageyH View Post
A lot of TVs have an LDR for auto-calibration of the image brightness.

Here is a document from 2013 on Cadmium.
https://echa.europa.eu/documents/101...b-8cf544dd4c02

My personal choice is to avoid cadmium containing devices where there is a practical alternative, but everybody is free to make their own choices.
But where entirely safe to use, https://lunainc.com/product/optocouplers/
as is the case with encapsulated types why deny yourself a better audio experience ? I think we are going round in circles.
I would like to know what Colin has achieved,