How I made a simple Remote On/Off for my Hi-Fi

My simple solution was to use an

AC Power Relay that was able to be triggered with a low voltage.
https://dlidirect.com/products/iot-power-relay

A simple IR remote-controlled relay for the control.
https://www.amazon.com/dp/B0BNBNF5MJ?psc=1&ref=ppx_yo2ov_dt_b_product_details

A cell phone charger to provide the needed 5VDC for the
IR Module and the triggering voltage for the AC Power Relay.

I mounted the IR remote-controlled relay in a small plastic box and
put the AC Power Relay and Charger behind the Hi-Fi and out of sight

A simple solution, and fairly clean.
 
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Love the Kasa plugs. After a recent visit to our daughter in Bermuda we bought 2 four packs of them, which once connected to wifi can easily be controlled via a mobile app. Right now we have one set on a permanent timed cycle for a bathroom towel warmer, and multiples of seasonal LED fairly light strings that can be voice commanded by Alexa.
 
The best smart plugs (and other IOT devices) are those that can be flashed with Tasmota firmware so you're not dependent on the manufacturer's app or an internet connection. Too many things will become e-waste prematurely because the manufacturer goes out of business or discontinues support.