- USB SOUND CARD FOR LAPTOP INSTALL
- USB SOUND CARD FOR LAPTOP DRIVER
- USB SOUND CARD FOR LAPTOP PC
- USB SOUND CARD FOR LAPTOP SERIES
The evaluation can be pretty easily done when you know what you’re looking for. For more convenience, it’d be better to take off the microphone socket from the PCB because then you can easily extend a three-core screened cable (5 V-GND-MIC) from the PCB to the outer world through the space leftover.īefore the hacking attempt, do a quick test to check the functionality by connecting one standard electret condenser microphone (ECM) to the microphone input socket (yellow) of the “untouched” USB sound card with the correct ± polarity i.e., “+” of the microphone to the “tip” of the 3.5-mm stereo audio jack and “–” to its “sleeve.” Yes, you’re building a simple USB microphone!Īfterwards, you can start the evaluation with the help of Audacity (or similar software).
USB SOUND CARD FOR LAPTOP PC
Nevertheless, a few more modifications may need to be carried out aside from the above alterations to make the USB sound card fully useful as an adapter for a PC sound card oscilloscope. As far as I know, there’s no digital high pass for the microphone input (Pin 27) inside, so CM108 (and CM119) can accept DC input. For DC coupling, you can bridge the 1-♟ capacitor (C3) with a piece of wire (0-Ω jumper). Simply bumping off the 1K2-Ω resistor (R7) from the PCB will remove the microphone bias, though it’s not important in some situations.
However, a closer look at the electronics of my USB sound card revealed that the “monophonic” microphone input is AC-coupled to the chip’s input by a 1-♟ capacitor, and the microphone input also has a bias feed (for electret microphone) that is about 2.8 V (measured in an open state). You can obviously connect your hardware to your PC through the microphone input of the USB sound card. Furthermore, your accidental slips never break your internal sound card, thus preventing costly disastrous consequences. Because USB sound cards are usually hassle-free, you will likely just need to plug it into a vacant USB port to start the fun. If you’re working on some PC-based audio projects or experiments, using an external sound card will be more comfortable and safer than fiddling with the internal sound card of your favorite computer. The on-board LED remains steady in standby condition but starts winking fast in the active state i.e., while it’s handling audio signals. We can see the USB VID and PID in the Device Manager window as well. If installed correctly, we can see the USB sound card as a “USB PnP Device” in the Device Manager.
USB SOUND CARD FOR LAPTOP INSTALL
So when the USB sound card is plugged into a Windows PC for the first time, it’ll automatically install required device drivers instantly.
USB SOUND CARD FOR LAPTOP DRIVER
Admittedly, I didn’t get the precise part number of the chip, but the overall design of this particular device is a mere replica of the application example of CM108, I’m sure.īecause the USB sound card is a PnP device, it hardly requires special device driver software.
USB SOUND CARD FOR LAPTOP SERIES
Another popular chip in this series from C-Media is the CM119, another 48-pin (LQFP) highly integrated single-chip USB audio controller but designed specifically for Voice over Internet Protocol (VoIP) applications. All essential analog modules are embedded in the chip, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and USB transceiver. In this device, a chip-on-board (COB) version of the controller (or its clone) is used, and in all probability, it’s the CM108, a 48-pin (LQFP) highly integrated single-chip USB audio solution. The inside electronics is surprisingly simple because the design is based on a USB audio controller chip by C-Media Electronics Inc. Above all, it’s a true plug-and-play (PnP) device for Windows PCs. Because the tiny device uses a USB port for power, an external power supply adapter is not required. This $1 product that I bought from Amazon is nothing but a USB sound card (integrated two-channel USB audio controller) with audio connectors. Let’s begin with the above photo of a cheap electronics gizmo that made me curious.
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