Menu
Sound may stop playing on a Windows 7 system for a few reasons. If your computer has no audio, confirming that the sound card is installed correctly is one troubleshooting step. You'll also need to ensure that all of the audio cables are properly connected and the speakers are receiving power. If these basic steps do not restore audio, you can run a Windows troubleshooting wizard to find and fix sound problems.
Summary
Few months ago I have seen USB sound card called Alien DAC. The construction on the project web page inspired me to build this thing also. Today making a sound card is no more a complex issue. You can create a fully functional USB sound card using PCM2702 from Texas Instruments. This sound card can be powered from USB port and has one stereo output. You dont need to install any driver for Windows XP and Vista, because they are already inside. This is really plug and play. The core of this construction is 16-Bit Stereo Digital-To-Analog Convertor with USB interface PCM2702. How I Designed This introduction PCM2702 Datasheet PCM2702 needs only few additional parts to work. The schematic is not complex. Sound card can be powered directly from USB port (jumper W1) or from external power supply (jumper W3). PCM2702 needs two power supply 3.3V (3V-3.6V) and 5V (4.5V-5.5V). I used fixed output voltage LDO TPS76733Q for 3.3V (IO2) and adjustable output voltage LDO TPS76701Q for 5V (IO3). Both LDO are produced by TI, I used this because I had it in my drawer. Any similar LDO can be used. Output voltage of IO3 should be set to little bit lower than input voltage to allow LDO good stabilization, in my case output voltage is set to 4.8V. Output voltage can be set by adjustable resistor R33. In case of low power supply, IO3 can be shorted by jumper W3. LED D3 signalizes power on. process Small ferrite beads are placed before all power pins of PCM2702 and in Vbus and GND of USB. These small beads reduce high frequency hum. I had a problem find this small SMD ferrite beads in local stores but finally I acquire few of them from old hard drive. They are not absolutely necessary, you can use zero ohm resistors instead of them.Low-pass filter is placed in output signal path to reduce sampling frequency. An OPA2353UA dual op amp is configured as a stereo 2nd-order low-pass filter. Led diode D1 is illuminated when PCM2702 plays audio data received from the USB bus. Led diode D2 is illuminated when USB bus suspends audio data transmission to the PCM2702. Conclusion This circuit works very well. I only shorted crystal during soldering so the circuit didnt work, but after removing the short the sound card started to work. I have tested in Windows 2000, XP and Vista. It works in all mentioned systems. Drivers are present in operation system so the sound card is ready in few seconds after you connect it. During writing this article I have found that PCM2702 is now not recommended for new design, but TI offer even better solution. PCM2704, PCM2705 have same functionality as PCM2702, but they include output filter. They are able to drive directly headphones. Volume and Mute can be controlled through SPI bus in PCM2705 or with pushbuttons in case of PCM2704. PCM2704 and PCM2705 are in TSSOP28 package. PCM2706 is similar to PCM2704 and PCM2707 to PCM2705 but in addition they have I2S bus. PCM2706 and PCM2707 are in TQFP32 package. I recommend using these new chips for new design (look at the TI web page). Step 1
Click the 'Start' button, select 'Control Panel,' and then choose 'System and Security.'
Step 2
Click on 'Device Manager' in the System section and enter your administrator password, if prompted. Soal tentang musik gitar saja jakarta.
Step 3
Double-click on 'Sound, Video and Game Controllers.' Verify that a sound card is listed. If you don't see a sound card, check your PC's user manual for re-installation instructions.
The company went bankrupt in 1993, and since the original typeface was created before 1923, the typeface is in the public domain.We decided to make our own version, and contribute it to the Open Source Type Movement. Champions regular font download. It was originally designed by for the in 1903. League Gothic is a revival of an old classic, and one of our favorite typefaces, Alternate Gothic #1.
Step 1
Moto guzzi v7 iii mpg. Check that your external speakers or headphones are connected to the computer. Verify that the audio plug is not mistakenly plugged into the Line In jack.
Step 2
Confirm that your HDMI audio device is set to default, if you are using an HDMI audio cable. Click 'Start | Control Panel| Sound | Playback.' Select your HDMI device, then click 'Set Default' and 'OK.'
Step 3
Refresh the USB audio device, if one is in use. Unplug the USB cable from the computer and restart your audio program. Test for audio playback on a non-USB device. Reconnect the USB device and follow the Windows prompts to reload the driver.
Step 1
Verify that your speakers are turned on and properly connected to a power outlet.
Step 2
Click 'Start' and select 'Control Panel.' Choose 'Hardware and Sound,' and then click on 'Adjust System Volume.'
Step 3
Move the 'Volume' slider up. Make sure that the volume is not muted. If a red symbol is visible, click on the 'Volume' button to unmute the speakers.
Step 1
Click the 'Start' button and select 'Control Panel.' Type 'troubleshooter' in the search field.
Step 2
Choose 'Troubleshooting.' Locate the 'Hardware and Sound' section and click 'Troubleshoot Audio Playback.'
Step 3
Enter your administrator password, if prompted. The troubleshooting wizard will automatically attempt to fix your audio problem. Follow the on-screen prompts to complete the process.
How To Make Sound Card OscilloscopeReferencesAbout the Author
Benjamin Aries has been involved in digital media for much of his life and began writing professionally in 2009. He has lived in several different states and countries, and currently writes while exploring different parts of the world. Aries specializes in technical subjects. He attended Florida State University.
Photo Credits
More ArticlesComments are closed.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |