I recently upgraded my AV Receiver to HDMI capable. In the last decade, I've replaced my receiver too many times to get from Dolby PLII to Dolby D, then from Dolby D to Dolby D Plus, and now from Dolby D Plus to Dolby TrueHD. Each time, not only replacing the "brains", but the amps as well.
I've finally come to the realization that the "brains" will need constant upgrading (seems 4k support is next), while the power amplification always stays the same. So, I've started investing in external power amps. This way it's much cheaper to replace just the "brains".
My current problem is that the receiver I have does not have any kind of amp power trigger, nor do the power amps themselves. All power amps are plugged into a Furman power conditioner with a manual on/off rocker switch.
I'd like to either find a pre-made or build my own power relay. Since my receiver does have a USB port on the back with +5v, I figured I could use that for the trigger. I just need to build a single gang electrical box that will have a standard electrical outlet for the furman unit to plug into and two wires coming out..one standard 110v plug to the wall, and a USB cable to plug into the port on the back of my receiver
The missing piece here is what kind of relay I need to put inside that will switch the 110v connection on/off by presence of the +5v from the USB on the receiver.
I figure this could already be made by some company, but some goggling didn't turn up anything (maybe I'm not using the correct search terms). I also figure that, if not, this sort of thing would come in handy for many readers of this forum if someone with a tad bit more EE experience could fill in the blanks here.