PCBA  Images

About TECircuit

Found: TECircuit has been operating since 2004.

Location: An electronics manufacturing service(EMS) provider located in Shenzhen China.

Item: Customizable EMS PCB, offers a full range of one-stop shop services.

Service: Printed Circuit Board (PCB)and Printed Circuit Board Assembly(PCBA), Flexible Printed Circuit Board(FPC), Components Sourcing, Box-Building, Testing.

Quality Assurance: UL,ISO 9001, ISO 14001, ISO 13485, ITAF 16949 andcomplied with ROHS and REACH.

Factory Pictures:
Company's own plant : 50,000 sqm; Employees : 930+; Monthly production capacity : 100,000 m2

PCBA  Applications

• Home Entertainment and Social Singing: The PCBA integrates microphone preamps, audio mixing, and vocal effects processing to amplify voices over background music, enabling friends and family to enjoy singing along to instrumental tracks with professional echo and reverb for an engaging party experience.

• Commercial Karaoke Bar and Hospitality Operation: Powers commercial-grade systems in bars and lounges by managing multiple microphone channels, integrating with large-screen displays for lyrics, and often supporting coin-operated or room-booking systems to drive revenue through entertainment services.

• Portable and Outdoor Music Performance: Enables all-in-one, battery-powered portable karaoke machines. The PCBA combines a media player, amplifier, and wireless microphone receiver in a single unit, allowing for singing and music playback anywhere, from living rooms to outdoor gatherings.

• Vocal Training and Music Education: Serves as a practice tool for singing students by providing key control (pitch shifting) to match a song to the singer's vocal range and features like voice cancellation, allowing learners to isolate and practice their voice against the original melody.

• Professional Audio and Public Address (PA) Function: Functions as a compact PA system for small events, meetings, or presentations. The PCBA's core mixing and amplification capabilities allow it to be used for speech amplification and background music playback beyond just karaoke.

PCBA Features 

1. Multi-Channel Microphone Preamplifier and Audio Mixer: The PCBA features multiple independent microphone preamplifier circuits with individual gain control. These feed into a hardware or DSP-based audio mixer that blends the microphone signals with the music source (e.g., from Bluetooth, USB, or auxiliary input) into a single output.

2. Digital Signal Processor (DSP) for Vocal Effects: Incorporates a dedicated DSP chip that applies real-time audio effects to the microphone input. This processor is responsible for generating adjustable echo, reverb, and sometimes pitch correction effects that are essential for the characteristic karaoke vocal sound.

3. Multi-Mode Connectivity and Media Playback Controller: The board integrates a suite of connectivity controllers: a Bluetooth module for wireless audio streaming from smartphones, a USB host controller for reading audio files and lyric data from flash drives, and sometimes an SD card reader. A media processor decodes common audio formats (MP3, WAV).

4. Lyrics Video Synchronization and Display Output: Includes a video processor (or utilizes the main SoC) that overlays synchronized song lyrics (typically from specialized LRC or CDG files) onto the background video or image. It outputs this composite signal via HDMI, VGA, or composite AV ports to a television or monitor.

5. Key Control and Voice Cancellation Processor: Features dedicated audio processing algorithms for two core karaoke functions: Key Control (Pitch Shifting) alters the musical key of the backing track without changing its tempo, and Voice Cancellation attempts to attenuate the lead vocal frequencies from a standard stereo music track.

6. Integrated Audio Power Amplifier and Output Stage: Contains a multi-channel Class-D or Class-AB power amplifier circuit capable of driving the machine's built-in speakers at high volume. It also provides a pre-amplified line-out or headphone output for connecting to external sound systems or for private listening.

7. Advanced User Interface and Lighting Control: The PCBA manages a complex user interface, including physical buttons, knobs for echo/volume, and often a front-panel display. It may also include drivers for colorful LED party lights that can sync to the music's beat, enhancing the festive atmosphere.

FAQ

​PCB & PCBA  Description​