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The TK103 at an angle: a black board with a wide gold border, a black 3.5 mm headphone jack standing off the back edge, the twenty-legged PCM5102 in the middle surrounded by small capacitors, two round LEGO holes, and six right-angle pins out of the front edge printed GND, 3V3, BCK, DIN, LRCK and XSMT.
VR

View it in VR

This board opens in a VR headset: life-size, or big enough to stand beside, with every pin and every part named where it sits. Open this address in the browser on a headset such as Apple Vision Pro or Meta Quest.

learn.lonelybinary.com/vr/tk103
You have this

I2S DAC

TI's PCM5102A stereo DAC and a 3.5 mm jack on a TinkerBlock board, for the ESP32-S3, which has no DAC of its own. Three wires carry the samples in and the chip makes its own master clock from the bit clock. The output is line level, 2.1 V RMS: headphones and powered speakers, never a bare speaker. 3.3 V only, and XSMT is already held HIGH.

Full scale
2.1V RMS, line level
Supply
3.3V only, never 5 V
Dynamic range
112dB, datasheet
XSMT
HIGHby a 10 kΩ pull-up; LOW mutes
Start here · 01 Numbers to a voltageOpen the board in 3D

Every pin and part: BCK, DIN and LRCK into the PCM5102, XSMT held high by 10 kΩ, the charge pump, and the 470 Ω and 2.2 nF on each output.

Product questions & answers ↓

The rest of the kit

All three blocks come in the one I2S audio kit. The microphone records, the amplifier drives the speaker, the DAC feeds headphones or powered speakers; the harder builds join two of them.

See this board 3.3V, as printedI2S AmplifierInto 4 Ω: 1.2 W at 3.6 V, datasheetSee this board 3.3V, never 5 VPDM MicrophoneSensitivity: -26 dBFS at 94 dB SPL
You have this2.1V RMS, line levelI2S DACSupply: 3.3 V only, never 5 V
The whole handbook9 articles · 45 minQuick referencePDF · 346 KBModel (GLB)GLB · 2.5 MBCAD (STEP)ZIP · 1.9 MBPCM5102A datasheetPDF · ti.comPinout and specsThe pin table, and the questions people ask first
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Email us or reply to your order, and quote tk103 — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

Take it with you

Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.