That USB DAC should work fine if you're only looking for something with an analog output. As for the speakers, after quickly looking at them, they appear to have a built in amplifier, so you should be able to plug into the speakers with this card and be good to go, no external amplifier needed.royle wrote: I've read this thread (plus multiple similar ones) and so far, I have this:
a) i need a DAC to eliminate that annoying popping
-> The PCM2704 USB DAC from this thread would do the job i guess? One more question here: is this item here http://dx.com/p/usb-dac-pcm2704-decoder-red-172991 also good, or is it better to just get the one from aliexpress?
b) i need an amplifier to get some noise out of my speakers
-> I have no idea what are my options here, so I'm open to suggestions. At the moment I am using ALSA only, would it help if i tried PulseAudio (or some other audio driver/software), or do I really need some sort of an amp (I really don't know much about this stuff, it's a bit confusing to me...). Oh, the speakers in question are these: http://www.geniusnet.com/wSite/ct?xItem ... ctNode=147
Project looks good, I ended up using liquid electrical tape on my LED on the sound card...it is bright. Probably could have just snipped one of the LED leads or de-solder it.speculatrix wrote:Just wanted to say another thanks for the heads-up re that USB sound card. I've got it working great now, via a tiny amp board bought from Aliexpress, for my dawn clock project. You can read about it here: http://speculatrix.tumblr.com/post/4051 ... pt-3-audio
Interesting...I wasn't aware of anyone have problems with popping on the USB sound card...well, at least not the one I recommended based on the PCM2704, but good find if it helps others solve their popping sounds.koonyue wrote:Guys,
I have solved the "pop" sound problem when USB out
Code: Select all
rmmod snd_usb_audio modprobe snd_usb_audio
Code: Select all
amixer sset PCM mute amixer sset PCM unmute
I was thinking it could be something like that. I even switched the power adapter to test but no dice. Sometimes it works throughout a whole song and then starts to fail and the connection drops.ski522 wrote:Most likely getting hit by the USB bug. Search for the "usb redux" thread which explains more. I had issues when I had my wireless Logitech keyboard plugged in, but it worked fine without the keyboard.
Unfortunately I already did this. And one think that hit me know, this command slows down both ports, right? Is it possible that this could be causing the problem with the wifi adapter?ski522 wrote:You could try dropping the USB port speed down if you haven't already. This is done by adding
Yes as there is only 1 USB interface driving the 2 USB ports and the Ethernet port. And the slower speed could be a problem if you're using wireless on a g/n network as USB 1.1 is only 12Mbps for speed and wi-fi G can hit 25Mbps. Should be a problem for music, but could be if you're doing other things. Most likely the issue is due to the USB bug.massayoshi wrote:Unfortunately I already did this. And one think that hit me know, this command slows down both ports, right? Is it possible that this could be causing the problem with the wifi adapter?ski522 wrote:You could try dropping the USB port speed down if you haven't already. This is done by adding
Tried all the "dwc_otg" options and none of them worked properly. Also switched the power source and the stream was still very intermitent. I have another usb wifi card that I'm gonna try today.ski522 wrote:Yes as there is only 1 USB interface driving the 2 USB ports and the Ethernet port. And the slower speed could be a problem if you're using wireless on a g/n network as USB 1.1 is only 12Mbps for speed and wi-fi G can hit 25Mbps. Should be a problem for music, but could be if you're doing other things. Most likely the issue is due to the USB bug.
You need to follow this thread in this forum about getting the card to work with XBMC, http://forum.stmlabs.com/showthread.php?tid=1052jr00n wrote:Hi, i've also bought at AliExpress.com the PCM2704 DAC board.
But can't get it working. I'm using the last RaspBmc.
Choose the setting of audio engne and i see in the DMESG log and lsmod that usb_audio is loaded. Even i can get the analog out on the board working (not so loud, but working) if i choose in XBMC:
System - Settings Audio: Audio Output device: USB Audio DAC Analog Stereo (PulseAudio)
But when i choose at the first entry: Audio Output Optical/Coax instead of HDMI, i can't get any sound out of my DAC.
Also i've noticed that i can't choose a value on the option: Passthrough output device. It only displays Defaults (Pulse Audio)
I've checked DTS and AC3 capable receiver because my amp can handle those protocols.
Does anybody have some suggestions? I really would like to have it get working...it looks i'm close
it seems that the RTL8188CUS-based wifi cards all have problems when used with analogue audio.massayoshi wrote:Just finished setting up the whole thing with the USB DAC mentioned here and it worked flawlessly with the RPi wired to the network but when I switched to the Edimax EW-7811un wifi card it didn't work properly. It would only play a few parts of the song like if it was buffering. I should mention though that before my USB DAC arrived, I could get a perfect stream using the onboard sound card.
i've got the same whine when the music is off too (freaks the cat out!) using the pcm2704 and a 3w amp i nicked from some usb speakers (has on/off switch and volume pot)speculatrix wrote:Having thought I'd solved all my problems with sound, I now have a new one.
For my dawnclock project (link) I'm using the USB sound card recommended in this thread, which is working fine. But because I'm using the headphone jack, I'm also using a small amplifier board to boost the signal. It looks like this:
It works, but... after playing sounds, I'm left with a distinct whine/whistle - loud enough to be irritating when we're trying to sleep. This is audible through the speakers. I found that if I put my finger on the main chip on the amplifier board, the whine winds down and disappears. Remove my finger, and it winds up again.
Powering down & up again also eliminates the whine (yes, I turned it off and on again) - until the next time I play something.
My first thought was a weak ground connection, but checking & double-checking reveals that isn't so. Maybe it's just what you get buying a cheap board from China!
So, any suggestions what I might replace this board with. Needs to be cheap & simple - don't need physical controls and the 3W/channel I'm getting from the current board is ample. All help appreciated.
i think perhaps the pcm2704 isn't as great as people think. i've had the whine with two amp boards and two sets of speakers.ski522 wrote:Does the problem happen if you are just using headphones without the amp? If no, then makes me wonder if there is a common ground issue with the PCM2704 and amp board. I suggest heading over to the diyaudio forum http://www.diyaudio.com/ and maybe asking the question there as people there.