The ISD1820 Voice Recording Module is a simple and effective audio recording and playback board designed for DIY voice message and sound storage projects. It includes an onboard microphone for direct recording and supports playback through an onboard speaker output or external amplifier. With push-button controls and easy microcontroller triggering, this module is widely used in talking toys, voice alerts, security alarms, and interactive electronics projects.
Core Module Specifications
• Module Type: Voice recording and playback module
• Recording IC: ISD1820
• Recording Method: Onboard microphone input
• Playback Output: Speaker output / audio output pins
Electrical & Interface
• Operating Voltage: 3 V – 5 V DC
• Control Method: Push buttons (REC / PLAYE / PLAYL)
• Trigger Support: Microcontroller control pins (active HIGH/LOW, module dependent)
• Output Interface: Speaker connector + audio output pads
• Mic Type: Onboard electret microphone
Performance Characteristics
• Recording Time: Up to ~10 seconds (typical)
• Audio Quality: Suitable for voice playback
• Non-volatile Memory: Keeps recording after power OFF
• Quick recording and instant playback
Physical Characteristics
• Module Type: PCB-mounted voice module
• Onboard Buttons: Record and playback keys
• Compact and lightweight design
• Includes external small speaker (kit dependent)
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• Raspberry Pi GPIO triggering
• Voice alert projects
• DIY sound and automation systems
Key Advantages
• Record and play without any programming
• Simple push-button operation
• Supports external trigger control
• Great for voice notification systems
Technical Insights
• Recording length depends on module settings and oscillator
• Output is best for voice (not high-fidelity audio)
• Can drive small speaker directly
• External amplifier improves loudness and clarity
Applications
• Voice reminder and alert systems
• Talking toys and greeting projects
• Security warning sound modules
• Interactive DIY electronics
• Educational audio experiments
Pro Tip
• Record in a quiet environment for clear audio
• Use external amplifier for bigger speakers
• Avoid touching microphone during recording
• Use stable 5 V power for best performance
Package Includes
• 1 × ISD1820 Voice Recording Module
• 1 × Microphone (onboard)
• 1 × Loud Speaker (if included in kit)