If you stick to the part numbers specified, you will be OK. It's important to make sure the XOR gate has a low propagation delay otherwise the circuit will not work. This signal is coming in at approximately 25Mhz making it the fastest signal on this board. IC5 is an XOR gate converted as an inverter to correct the polarity of the BCK signal. IC5 is worthy of some explanation for some reason the BBB outputs an inverted BCK signal which messes with the chip. The chip itself is pretty straightforward to use you feed it a serial stream and out comes the audio. That signal can then be fed to a set of powered computer speakers for playback. It converts the I2S stream coming out of the Beaglebone Black and converts it to a line level audio signal on the output. The star of the show here is the PCM5102 Audio DAC chip. There are many features I wish I would have had when I originally designed this project (Obstacle Avoidance, how did I ever route without you?). I feel very comfortable with it and thanks to Autodesk's acquisition it's capabilities have greatly increased( Full disclosure: I'm a product support specialist for EAGLE at Autodesk). I've been using EAGLE for almost 10 years. In doing so I learned a lot and that's what I'll be sharing with you. Sometimes the simplest things are the ones that take the longest to solve, my hope is that my experiences can give you the courage to try a project that goes beyond your comfort zone. My goal in this instructable is to highlight some of traps I ran into as I was working on this project, so that you can avoid them on your own projects. The webinar above covers more of the design process so it's worth a watch. I recommend you download it to follow along with this instructable. Because of this I designed an add-on board(cape in the beaglebone world) to handle audio output from the BBB.Īll of the files for this design are available on github here: The BeagleBone Black(BBB) doesn't have a built-in audio output and before the wireless variant of the BBB was available I had to use a USB dongle for Wifi. This is a project I made two years ago, because I wanted to listen to online radio stations.
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January 2023
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