Chromecast Audio Adapter

Posted by Jen Tong on November 29, 2014

I listen to music on Chromecast all the time, and it’s awesome, but sometimes I like to listen to music on my stereo, which has no HDMI input. For the past year I searched for a cost effective way to adapt the wonderfully cheap $25 Chromecast to audio only hardware.

I found a $15 adapter that works great, but it required a little hacking.

Yes, that’s a resistor sticking out of it. Here’s a step-by-step.

  1. Buy a LinkS hdmi to vga adapter. They’re about $15 on Amazon.
  2. Plug in your Chromecast and give it a spin. If yours is like mine, no audio came out, which is really sad.
  3. Find a 75 ohm resistor, or a more common 82 ohm resistor. Create a VGA dummy plug. You might need to wire up as many as 3 resisors, but mine works fine with only one resistor connecting pins 2 and 7.
    Schematic
  4. Plug it in to USB power, and then plug in a 3.5mm audio cable. Give it another test.
  5. Is it buzzing? It’s probably a ground fault. Make sure that the stereo and Chromecast’s power supply have a common ground. In other words, try plugging them into the same power strip.