Visaton K 28 WP - 50 Ω is a 2.8 cm miniature speaker with a Mylar diaphragm, designed for very small devices. It offers a balanced frequency response and good voice reproduction, with IP65 protection at the front and operation down to −40 °C. Its 50 Ω impedance reduces the current drawn from the driving circuit.
Key features
- Ultra-compact: Ø 28 mm, 5.5 mm thick and just 7 g.
- IP65 at the front: protected against dust and water jets when built into a sealed enclosure.
- High impedance: 50 Ω, useful in low-current circuits or when several speakers share one output.
- Clear voice: 300–20,000 Hz with a balanced response.
- Cold-resistant: tested for operation in the cold to EN 60068-2-1/EN 50155, range −40 to 70 °C.
Technical specifications
- Type: miniature speaker with Mylar diaphragm
- Rated power: 1 W
- Maximum power: 2 W
- Nominal impedance: 50 Ω
- Frequency response: 300–20,000 Hz
- Mean sound pressure level: 75 dB (1 W/1 m)
- Resonance frequency fs: 600 Hz
- Excursion limit: ±0.5 mm
- Voice coil diameter: 13.5 mm
- Height of winding: 2 mm
- External dimensions: Ø 28 × 5.5 mm
- Cutout diameter: Ø 24 mm
- Net weight: 7 g
- Protection: IP65 at the front, when built into a sealed enclosure
- Operating temperature: −40 to 70 °C
- Connections: solder pads
- Colour: black
- Visaton article number: 2910
Typical applications
Signalling and monitoring speaker for small electronic devices, handheld equipment, measuring instruments, outdoor sensors and terminals, toys and gadgets, wearables and maker projects with Arduino or ESP32 playing tones, beeps and short voice messages.
Mounting and wiring tips
- For IP65, build it into a sealed enclosure over a Ø 24 mm cutout, with the front facing outwards.
- Solder wires to the pads quickly and at moderate temperature, without heating the diaphragm for long.
- Do not connect it directly to Arduino or ESP32 pins: use a driver transistor or an amplifier module such as LM386, PAM8403 or MAX98357.
- Many amplifier modules are optimised for 4–8 Ω: into a 50 Ω load they deliver less power, which suits signalling but should be checked in the module datasheet; in any case stay within 1 W rated.
- A small closed volume behind the diaphragm improves output and sound pressure.
Warnings. This item is an electronic component (part, board, module or accessory) intended for people with technical skills in electronics, for development, prototyping, education, repair and integration into other equipment. It is not a ready-to-use finished product or a toy and is not suitable for children under 14. Wiring, power supply, installation and use are the buyer's responsibility, following the manufacturer's documentation and the applicable safety rules. Anyone who integrates it into equipment placed on the market becomes its manufacturer and must ensure its conformity (CE marking under directives 2014/30/EU on electromagnetic compatibility, 2014/35/EU on low voltage and, for radio functions, 2014/53/EU). Consumer rights under Italian Legislative Decree 206/2005, including the legal guarantee of conformity, are not affected.
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