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JLH Portable Megaphone Speaker PCBA – 13-Voice Modes, Bluetooth Audio, and Recording Support – High-Power Voice Amplifier Circuit with Volume Control

Parameter	Detailed Specification
Model	JLH Megaphone Controller PCBA
Operating Voltage	3.7V to 5V DC (Li-ion Battery compatible)
Audio Modes	13 Distinct Voice/Siren Effects
Connectivity	Bluetooth Audio & Wired Mic Input
Recording Feature	Integrated Digital Recording/Playback
Amplifier Class	Class D High-Efficiency
Control Interface	Tactile Buttons & Potentiometer (Volume)

Price

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₹ 135.59

(Tax included)

Barcode: 90745

Product Description

Engineered for high-impact voice projection, the JLH Portable Megaphone Speaker PCBA is a versatile all-in-one circuit board for DIY megaphone builds and industrial public address systems. This module combines a high-power audio amplifier with a digital signal processor (DSP) that supports 13 unique voice modes, including various sirens and alert tones. At Robogears, we recommend this PCBA for its integrated Bluetooth connectivity, allowing you to stream audio wirelessly or record voice messages directly for looped playback. Featuring a dedicated volume control potentiometer and energy-efficient Class D architecture, it is designed to drive standard megaphone horn speakers with maximum clarity and minimal battery drain.

Detailed Key Features

13 Multipurpose Voice Modes: Includes standard voice amplification along with 13 pre-programmed siren, whistle, and alarm tones for crowd control and emergency signaling.
Bluetooth & Recording Capability: Allows for wireless audio streaming from smartphones and features a built-in memory buffer for recording and looping custom voice announcements.
Integrated Volume Management: Features a smooth-acting potentiometer for real-time volume adjustment, ensuring distortion-free audio at high output levels.
Low Voltage Efficiency: Optimized to run on a single 3.7V 18650 Lithium-ion cell, making it perfect for portable, battery-powered handheld devices.
Compact PCBA Layout: Industrial-grade PCB design with clearly labeled solder pads for battery (B+/B-), speaker (SP+/SP-), and microphone (MIC) connections.

All Technical Details

Onboard Buttons: Trigger switches for Record, Play, Mode Selection, and Siren.
Audio Format: High-bitrate digital recording for clear message reproduction.
Protection: Built-in over-current and thermal protection within the amplifier stage.
Input Interface: Supports external electret condenser microphones.
Standby Current: Ultra-low power consumption when not active to preserve battery life.

Prototyping & Engineering Tips (Robogears Exclusive)

Speaker Matching: To achieve maximum volume at your Pimpri workshop, pair this PCBA with a 4Ω or 8Ω horn-type speaker. Ensure the speaker's wattage rating matches or exceeds the output of the PCBA (typically 10W-20W).
Power Supply Logic: Use high-discharge 18650 cells (like our 2600mAh 44g model) for consistent performance. If you notice the Bluetooth disconnecting during loud peaks, add a 1000uF capacitor across the power input pads to stabilize the voltage.
Feedback Prevention: When mounting in a handheld chassis, ensure the microphone is acoustically isolated from the speaker horn to prevent high-pitched feedback squeals (Larsen effect).
Antenna Placement: Keep the onboard Bluetooth trace antenna away from large metal objects or thick wires to ensure a stable wireless range of up to 10 meters.

Package Includes

1 x JLH Portable Megaphone Speaker PCBA (Bluetooth & Recording Version)

Image Disclaimer

Product images are shown for illustrative purposes only. The exact component layout, PCB color (typically Green or Blue), or the number of onboard buttons may vary based on the latest firmware version, though all primary features and the 13-voice functionality remain as described.

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