M273 PT2399 NE5532 Microphone Amplifier 

The M273 microphone amplifier board is an audio processing module designed for microphone signal amplification with echo and reverb effects. It is built around the PT2399 digital delay processor and NE5532 low-noise dual operational amplifiers, delivering clear sound amplification with adjustable echo, delay, and tone control. This module is widely used in karaoke systems, DIY audio projects, and small PA or recording setups.

Technical Specifications:

• Audio processing IC: PT2399 digital delay processor
• Operational amplifier: NE5532 low-noise dual op-amp
• Input: Microphone input (MIC)
• Output: Line-level audio output
• Supply voltage: Typically DC 12V
• Delay time: Adjustable via onboard potentiometers
• Audio controls: Volume, echo, delay, and tone adjustment
• Connectors: MIC input jack, audio output jack, power input terminal
• PCB type: Through-hole components with onboard potentiometers

Features:

• Clear and stable microphone amplification
• Built-in echo and reverb effects using PT2399
• Low noise and low distortion audio performance
• Multiple onboard knobs for easy sound adjustment
• Suitable for dynamic microphones
• Compact and easy-to-integrate audio module

Applications:

• Karaoke microphone amplifiers
• DIY audio and sound effect projects
• Public address (PA) systems
• Home audio and mini mixer systems
• Recording and rehearsal equipment