Texas Instruments PCM Series Audio D/A Converter ICs are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas. Texas Instruments PCM Data Acquisition – ADCs/DACs – Special Purpose parts available at DigiKey. PCM SPI Arduino library is a bitbang SPI implementation which makes it possible to interface with the PCM USB DAC from Texas Instruments.

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Had some problems with the volume at first, it would change randomly when i got close to the PCB.

A SPI interface can be used to control playback on the connected computer. I wrote a small Arduino library so playback can easily be controlled from an Arduino. Yes, delete it Cancel.

Similar projects worth following. Become a member to follow this project and never miss any updates. It is a 3-W Stereo Class-D amp.

So i put some solder on the top side pad, put the IC on and applied heat on the bottom side. I just uploaded the schematics to the Github repo as a PNG file, hope it works!

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Many similar boards use an external DAC for better performance but since small size and cost is more importent in this project i choose the integrated DAC. The amplifier is capable of driving two 3 W, 8 Ohm speakers. The new PCB layout is soon ready: I think a bad ground connection caused this. I am almost done with the new schematic for the hopefully final version. When the DAC is connected to a computer it recognizes it as a USB sound card and no manual installation of drivers is need.

Here is the new PCB compared to the old one. Only some routing and adjustments left.

USB DAC with amplifier |

Your Password Forgot your password? The only thing left before i start pcm2750 the PCB layout is to check all footprints and recheck all connections.

Your Email Remember me. Nice to pcm205 a mostly through hole design for this. If so, how did you go about it? The only downside is that a external power supply is needed when volume is increased. I’m thinking about making something similar when I’m done with my current projects. I just finished soldering the components on the latest PCB.


Become a member to follow this project and never miss any updates Become a member. It’s actually not too many components. Does this project spark your interest? It does not show in the pictures but the thermal pad is also exposed on the bottom side of the PCB.

U nfortunately i could only solder the USB connector before my almost new solder station broke, so now i must get a replacement before i can continue. You should Sign Up. It’d be nice to see them without needing a CAD tool.


Got the new PCB and some missing components for the new version today! The USB-cable i used was very loose in the connector and when i changed the cable everything was fine.

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View all 21 components. Any chance you could put a PDF of the schematics in the Github repo? Sign up Already a member?