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The TK37 at an angle: a black board with a wide gold border, a square dark grey buzzer with cut corners near the top with a small round port and a plus sign on its lid, a black diode at the top right, a small LED and a resistor under the buzzer, a three-legged transistor and a resistor at the right, lonely binary and PASSIVE BUZZER up the left edge, a box printed PWM, and a right-angle four-pin header along the front edge.
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/tk37
You have this

Passive Buzzer

A magnetic buzzer with no oscillator of its own, switched by a transistor on a TinkerBlock board. It sounds only while SIGNAL is a square wave, at the wave's frequency, so tone() plays any note; it is loudest at its 2.7 kHz resonance. Held HIGH it is silent and the coil draws about 200 mA.

Loudest at
2700Hz, its resonance
Draws up to
95mA, not from your pin
Coil
16Ω, magnetic, not a piezo
VCC
3V3 or 5Von any board
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 reaches only a 1 kΩ into a transistor's base; the buzzer, a 16 Ω magnetic one, runs from VCC.

Product questions & answers ↓

The whole handbook10 articles · 45 minQuick referencePDF · 428 KBPassive Buzzer model (GLB)GLB · 1012 KBPassive Buzzer CAD (STEP)ZIP · 1.1 MBMLT-8530 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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Passive Buzzer

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk37.

Order or missing parts?

Email us or reply to your order, and quote tk37 — 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.