For some time I’ve been researching a unique way to integrate a “line level” volume control into my ST system. I’ve seen a few other posts on this and other forums with people looking to do the same so I guess it’s time to get this discussion started.
My current challenge is that I have a device that switches audio from different sources (TV, Sonos, etc.) and I want to be able to control/automate the volume of that line level output with ST.
Currently I can adjust the volume on my amps with my Harmony hub or if I choose I can rewire and use the Sonos line in feature but those options though functional are not ideal.
What I’m shooting for is a solution that gives me the ability to automate my audio volume to set percentages, similar to how the bulb dimmer sliders work.
I think using the PCM from the Cree Connected board may be the best solution.
One solution I’m considering is using the PCM output on the Cree to drive a servo or stepper attached to an ALPS potentiometer preamp kit readily available on ebay.
The challenge with this servo/stepper option doesn’t seem overly complicated other than calibrating the servo to operate in the same range as the ALPS pot which is “code wise” beyond the scope of my expertise without help.
The other and preferable solution involves using the PCM to control an LDR attenuator circuit similar to this… http://diyaudioprojects.com/Solid/DIY-Lightspeed-Passive-Attenuator/
With the LDR attenuator, if using the circuit described in the link, the section using the 100k dual pot would be replaced with something that performs it’s same function only controlled by the PCM output of the Cree board. Technically I suppose this pot could be controlled via servo but it sounds more fun to do it without the mechanical parts.
Anyway I would be interested in hearing other ideas or input on these if anyone else has a similar challenge.