My TV has crappy speakers (they all do these days)
I have a cheap T-class amplifier plugged into it, powering some decent speakers. I leave it turned on because the idle power draw is very low and it’s annoying to walk across the room every time I turn the TV on or off.
But still. There’s a very slight hiss, and it’s the principle of the thing.
How can I turn the amp on when the TV is on, and turn it off when the TV is off, without drawing much/any power when it’s off?
From the description of it: " the Intelligent Mains Panel with Surge Protection will automatically switch power to your monitor, scanner, printer, games console, speakers and other peripherals when your computer is in use"
Or if you really want to over-engineer it, and the TV is “smart”, you could use a combination of ARP and something like https://www.npmjs.com/package/lgtv to work out when the TV is turned on, and then use a GPIO on a Pi or micro to flip a relay.
Or an LDR/photodiode over the Standby light to detect the same.
…
or you could just use one of those things that already exists and would be much easier.
The Logitech Harmony universal remote control range implements this feature very well. Of course, your amp would need to be remote controllable, or a simple power on/off remote IR system for the amp would be required.
