Can i just plug it into my pc and plug in headphones to the dac to receive sound?

It requires an external power source, so I doubt it will not work with out it.

connecting this between a computer and stereo system, do I need a power supply?

yes. but if youre connecting your computer to an a/v receiver or stereo with optical in or coaxial in, meaning it does have a DAC; then you dont need this.

Does the without ac adapter version work with any phone charger?

Yes, the power input to the FiiO D3 uses USB power that any USB phone charger can provide.

Is the "Line Out" port on this an aux out port?

I use the RCA outputs to feed an older JVC sound system, and it works as expected. The Line out is a 3.5mm mini jack output which will drive headphones, and it worked in that capacity for me, so it should be compatible with any 3.5mm "AUX in" input. However, I used Line out only with headphones, and not as an input to a device other than headphones.

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FiiO D3 (D03K) Essential Edition Digital to Analog Audio Converter - 192kHz/24bit Optical and Coaxial DAC - Without AC Adaptor

FiiO D3 (D03K) Essential Edition Digital to Analog Audio Converter - 192kHz/24bit Optical and Coaxial DAC - Without AC Adaptor

Product ID: 99437577

Details

Brand
FiiO
Maximum Supply Voltage
5 Volts
Minimum Supply Voltage
5 Volts
Mounting Type
Coaxial
Number of Pins
6

🎧192kHz/24bit Hi-Res Audio

🔄Switchable Optical/Coaxial Input

🔋USB Powered, Ultra Low Jitter

Description

🎶 Elevate your sound game—because your ears deserve the best.

COMPACT POWERHOUSE - Ultra-low jitter design in a sleek 61.6x49.1x21mm form factor—small size, big impact.
PLUG PLAY CONVENIENCE - USB-powered with no bulky adapter needed—perfect for minimalist setups and on-the-go use.
AUDIOPHILE GRADE CLARITY - Experience pristine 24-bit/192kHz stereo sound that elevates every note.
RELIABLE SIGNAL INTEGRITY - Built-in PLL ensures stable, noise-free audio conversion for crystal-clear listening.
SEAMLESS DEVICE COMPATIBILITY - Effortlessly connect TVs, game consoles, and digital players with optical or coaxial inputs.

The FiiO D3 (D03K) Essential Edition is a compact, USB-powered digital-to-analog converter that transforms optical or coaxial digital audio signals into high-fidelity 2-channel analog output. Supporting up to 192kHz/24bit PCM audio with ultra-low jitter and switchable inputs, it’s ideal for connecting modern digital devices to analog amplifiers, speakers, or headphones. Its minimalist design and reliable performance make it a must-have for audiophiles and professionals seeking affordable, high-quality sound conversion.

Specifications

ASIN	B07L61JPQW
Best Sellers Rank	#698,785 in Electronics ( See Top 100 in Electronics ) #730 in Digital-Analog Converters #1,230 in Signal Converters
Brand Name	FiiO
Customer Reviews	4.5 4.5 out of 5 stars (250)
Interface	Coaxial, USB
Item Dimensions L x W	2.43"L x 1.93"W
Manufacturer	FiiO
Material Type	Copper
Maximum Supply Voltage	5 Volts
Minimum Supply Voltage	5 Volts
Model	8541740614
Mounting Type	Coaxial
Number of Channels	2
Number of Pins	6
Part Number	8541740614

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