I am working on an installation in a living space where there will be two wall mounted volume controls. Whichever volume control is last operated, should be the one that sets the volume of the audio.
The amplifier we’re using accepts a single 0-10v input, to control the volume from distance. The plan is to use standard 0-10v type wall mounted dimmer controls, that are simply analog pots underneath.
How can we use two (and optionally 3…) such wall mounted dimmer controls, so that the last one operated controls the volume of the amp?
A more precise request might be…
Compare two voltages A and B, which are between 0 and 10v. When either A or B changes by 5% (adjustable), switch the output to be the voltage of whichever one just changed.
I have researched other answers, including the excellent 'Most simple way to detect small voltage changes (~150mV)' which I was able to recreate successfully in iCircuit, but this and other answers don't allow for two 'variable' inputs as described.
As my experience is more on the AV side rather than circuit design, a suggested circuit like the one in the linked answer, would be awesome. Ideally I'm looking to use simple analog components that I can fashion a small circuit board out of.
Thanks in advance.