Lonely Binary
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The TK36 at an angle: a black board with a wide gold border, a tall round black buzzer near the top under a white paper seal printed REMOVE SEAL AFTER WASHING with a blue plus sign, a small LED, two resistors and a three-legged transistor below it, two round LEGO holes, lonely binary and ACTIVE HIGH up the left edge, and a right-angle four-pin header.
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/tk36
You have this

Active Buzzer

A 12 mm electromagnetic buzzer with its own oscillator, on a TinkerBlock board. SIGNAL HIGH beeps at about 2.4 kHz, LOW stops it: one note, one line of code. An S8050 transistor switches it from VCC, so your pin gives a few milliamps and VCC can be 5V beside a 3.3 V board. There is no pull-down on SIGNAL, so use a pin that stays LOW while your board boots.

Note
2400Hz, one fixed note
VCC
5V rated; 3V3 works, quieter
Draws up to
30mA, not from your pin
Pull-down
Noneuse a pin that is LOW at boot
Start here · 01 The four pinsOpen the board in 3D

Turn it over and see the three holes to wire: GND, VCC and SIGNAL. SIGNAL only feeds a transistor's base through 1 kΩ, with no pull-down; the buzzer runs from VCC.

Product questions & answers ↓

The whole handbook9 articles · 40 minQuick referencePDF · 433 KBActive Buzzer model (GLB)GLB · 1021 KBActive Buzzer CAD (STEP)ZIP · 1.0 MBTMB12A05 datasheetPDF · datasheet.lcsc.comS8050 datasheetPDF · datasheet.lcsc.comPinout and specsThe pin table, and the questions people ask first
Community

Product questions

See what other owners have asked, and read their solutions.

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Active Buzzer

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk36.

Order or missing parts?

Email us or reply to your order, and quote tk36 — 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.