The ESP8266 power circuit has been maintained identical to Wi-CASSS’s schematic.
#CREATE HOTSWITCH FOR AUDIO SOURCE DRIVER#
Here is a circuitjs link for the relay driver schematic. Original schematic.I redesigned the relay driver circuit to include status LEDs for each input and also simplified it a bit. BOM Main circuit ItemĪfter some shopping on AliExpress, the total cost amounted to almost 14 euros shipped (excluding LEDs and reistors which I already have) including many spare components, enough to make at least two complete circuits. I chose to go with a relay-based design because it’s simple to make and gives the best audio insulation. At the end I decided to make my own, basing my solution on Wi-CASSS, a design made by Govindan Unni. However, there are a few DIY solutions out there. There are plenty of audio switchers on Amazon, but none of them is controllable remotely.
Surprisingly enough, I didn’t find any commercial audio switcher that meets my needs. To simplify the solution I decided to exclude the record player from the problem, since it is rarely used and it needs the listener to set the right volume on the amplifier anyway. A simpler way to go is the use of a relay to phisically switch audio source when needed. The ideal solution would be to automate the switch on the amplifier, but this requires some ugly mechanics around the switch, or an invasive internal modification. Although nice and very convenient, this is not enough from keeping the listener from fiddling with the amplifier’s switches to choose the right audio source, since it gets toggled quite often between the TV and the Chromecast. The amplifier is powered through a smart plug that, through the power of Home Assistant, turns on whenever there is an active audio source and gets shut when there is none. There are a few audio sources connected to it: The HiFi system in my livingroom is centered around an amplifier from the ’80s.
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