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USB 2.0 Sound Card

USB20-SND

Adds headphone and microphone jacks over USB, bypassing a faulty or missing onboard audio.

Type: Converter
Connectors: USB-A

In-depth technical details

USB-A carries just 4 pins: VBUS (+5V power), a D+/D- differential data pair, and GND -- the simplest USB pinout, with no reversibility and no Power Delivery negotiation lines.

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Connector anatomy

USB Type-A

01 VBUS +5V power. Slightly longer than the other pins so it mates first and breaks last.
02 D+ / D− The differential data pair -- the same signal inverted on each wire, so noise cancels at the receiver.
03 GND The common ground -- the voltage reference every other signal is measured against.
04 Metal shell The plastic tongue sits in one half of the shell only, which is why the plug goes in one way up.
05 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
06 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

From the published standard

How it works

The external card carries its own digital-to-analogue converter (DAC) for playback and analogue-to-digital converter (ADC) for the microphone, entirely separate from the motherboard's built-in audio circuitry. That is why it fixes onboard-audio noise or failure -- the conversion happens entirely inside the external device, not on the motherboard.

Function: Independent DAC (playback) + ADC (microphone) over USB
Bypasses: Faulty or noisy onboard motherboard audio

This information comes from published sources about this type of product, not from the supplier.

en.wikipedia.org

Technical specifications

Type	Converter
Connectors	USB-A

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