8 Ohm 0.5W Mini Loudspeaker 28mm Small Trumpet Horn Speaker

8 Ohm 0.5W Mini Loudspeaker 28mm Small Trumpet Horn Speaker is an excellent choice for adding audio output to portable devices and compact electronics projects. This miniature speaker delivers clear audio and voice reproduction despite its small footprint, making it ideal for applications where space is a premium. The standard 8 Ω impedance ensures easy compatibility with common low-power audio amplifier ICs and microcontroller audio shields. Therefore, you can easily integrate this trumpet-style speaker into your design for confirmation beeps, alarms, or simple music playback without requiring complex power stages. Furthermore, its low power rating and robust construction ensure reliability across various operating conditions.

Key Features:

• Compact Form Factor: With a 28 mm diameter, this mini speaker is specifically designed for integration into small, portable, and space-constrained electronic enclosures.
• Standard Impedance: The 8 Ω nominal impedance ensures efficient power transfer when connected to most standard audio power amplifiers and ICs.
• Clear Audio Output: It provides sufficient volume and clarity for voice prompts, alarm signals, and notification sounds in various devices.
• Low Power Consumption: Rated for 0.5 Watts (500 mW), the speaker minimizes the power draw on battery-operated systems.
• Easy Mounting: The design typically includes mounting holes or flanges, simplifying mechanical installation into device housing.

Technical Specifications:

• Nominal Impedance (Z): 8 Ω (±15%)
• Rated Power (P_rated): 0.5 W (500 mW)
• Maximum Power (P_max): 1 W
• Frequency Range: Typically 300 Hz to 5 kHz (Optimized for voice and alarms)
• Sound Pressure Level (SPL): ≈ 85 dB/W at 1 meter
• Operation Mode: Dynamic speaker

Mechanical Specifications:

• Diaphragm Material: Paper or Mylar cone (Ensuring lightweight responsiveness)
• Magnet Material: Ferrite or Neodymium (Determining field strength and size)
• Mounting Type: Flange Mount with holes or Glue/Clip mount
• Connection Type: Solder Tabs or Wires
• Construction: Open-back design (Typical for trumpet horn speakers)

Dimensions:

• Diameter (D): 28 mm (±0.5 mm)
• Depth/Height (H): ≈ 5 mm to 8 mm (Varies by specific model)
• Mounting Hole Pitch: Typically 35 mm (Center-to-center, if flanged)
• Weight: ≈ 5 g (Extremely light)

Pinout and Wiring:

• Terminal 1 (+): Connect the positive output terminal of the audio amplifier or driver circuit.
• Terminal 2 (−): Connect the negative output terminal or ground return of the audio amplifier or driver circuit.
• Polarity Note: While dynamic speakers don’t have a strict polarity requirement for basic sound output, connecting the terminals correctly ensures consistent diaphragm movement, which is consequently critical when using multiple speakers for proper acoustic phasing.
• Wiring Recommendation: Use short, twisted wires between the amplifier and the speaker to minimize noise pickup and maintain audio quality.

Datasheet Reference:

• Download Example Mini Speaker Specification Sheet

Commonly Used in:

• Handheld Devices: Providing sound for portable gaming consoles, diagnostic tools, and GPS units.
• DIY Electronics Projects: Often chosen for Arduino, Raspberry Pi, and other prototyping audio feedback circuits.
• Small Appliances: Integrated into microwave ovens, rice cookers, and other appliances for audible alerts and confirmations.

Applications:

• Audible Alarms and Buzzers: Generating warning tones, beeps, and general system feedback.
• Voice Playback: Essential for simple voice recording and playback modules in toys, security systems, and teaching aids.
• Hence, engineers often utilize this component for low-fidelity speech synthesis.
• Signal Confirmation: Providing click or chime sounds to confirm button presses or state changes in user interfaces.

Equivalent Models:

• DFRobot DFR0271 Mini Speaker: A commonly referenced small speaker with similar 8 Ω impedance and power rating.
• CUI Devices CMS-2818-058: A high-quality model with comparable 28 mm diameter and electrical specifications, often used as a professional alternative.
• Generic 29mm Mylar Speaker: Many manufacturers produce functionally identical 8 Ω / 0.5 W speakers under different OEM part numbers.

Package Includes:

• 1 x 8 Ohm 0.5W 28mm Mini Dynamic Loudspeaker