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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The new PCB layout is soon ready: Only some routing and adjustments left. View all 6 project logs. Got the new PCB and some missing components for the new version today! Did some testing and everything seems to work.
View all 21 components. Nice to see a mostly through hole design for this. I think a bad ground connection caused this. U nfortunately i could only solder the USB pcm27705 before my almost new solder station broke, so now i must get a replacement before i can continue. The amplifier is capable of driving two 3 W, 8 Ohm speakers. Become a member to follow this project pcj2705 never miss any updates.
So i put some solder on the top side pad, put the IC on and applied heat on the bottom side. 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 only downside is that a external power supply is needed when volume is increased. Any chance you could put a PDF of the pcm27705 in the Github repo? It’s actually not too many components.
Sign up Already a member? I just finished soldering the components on the latest PCB. I am almost done with the new schematic for the hopefully final version.
USB DAC with amplifier
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The USB-cable i used was very loose in the connector and when i changed the cable everything was fine. It does not show in the pictures but the thermal pad is also exposed on the bottom side of the PCB. Already have an account?
Become a member to follow this project and never miss any updates Become a member. A SPI interface can be used to control playback on the connected computer. It’d be nice to see them without needing a CAD tool. I’m thinking about making something similar when I’m done with my current projects.
USB DAC with amplifier |
If so, how did you go about it? It is a 3-W Stereo Class-D amp.
When the DAC is connected to a computer it recognizes it as a USB sound card and no manual installation of drivers is need. Your Email Remember me. Had some problems with the volume at first, it would change randomly when i got close to the PCB.
Here is the new PCB compared to the old one. Does this project spark your interest? I wrote a small Arduino library so playback can easily be controlled from an Arduino. I just uploaded the schematics to the Github repo as a PNG file, hope it works!