ISD1820 Voice Recording Module With On Board Mic and Speaker

ISD1820 Voice Recording Module With On Board Mic and Speaker is a highly integrated, single-chip voice recording and playback solution that offers user-friendly functionality for recording short audio clips. This standalone module incorporates the robust ISD1820 chip, which uses non-volatile flash memory to store audio, therefore retaining recorded messages even after power loss without needing backup batteries. Featuring an on-board microphone, dedicated control buttons (REC, PLAYE, PLAYL), and a speaker output header, the module simplifies prototyping and deployment in various consumer electronics and educational projects. Furthermore, its direct-drive speaker capability eliminates the need for external audio amplifiers in many applications.

Key Features:

• Integrated Voice Solution: The module includes the microphone, control pins, and speaker drive circuit on a single PCB, offering immediate record/playback functionality.
• Non-Volatile Storage: Utilizes embedded Flash memory, meaning recorded audio remains stored indefinitely without requiring constant power or refresh cycles.
• Adjustable Recording Length: Users can typically record audio clips up to 10 seconds in duration at the standard sampling rate, often adjustable by external resistor.
• Simple Control Interface: Features three direct push-button controls (REC, PlayE, PlayL) for easy, hands-on operation without needing a microcontroller.
• Low Power Consumption: Designed for efficient use, especially in standby mode, extending battery life in portable applications.

Technical Specifications:

• Operating Voltage (V_CC): 3 V to 5 V DC
• Recording Time: 8 to 20 seconds (Adjustable via external resistor R_OSC)
• Sampling Frequency: ≈ 3.2 kHz (For 10-second recording)
• Speaker Output Power: Capable of directly driving an 8 Ω speaker at 0.5 W
• Standby Current: ≤ 1 μA (Extremely low power state)
• Output Type: PWM Current Source Output (Direct speaker drive)

Mechanical Specifications:

• Chipset: ISD1820PY Voice Recorder IC
• On-Board Components: Electret Condenser Microphone and LED indicator.
• Mounting: PCB module with 2.54 mm (0.1 in) pin headers for easy breadboard or jumper wiring integration.
• Package Type: Through-Hole Module

Dimensions:

• Module Board Size: ≈ 38 mm x 42 mm
• Mounting Holes: Two standard mounting holes provided for secure installation.
• Pin Header Pitch: 2.54 mm

Pinout and Wiring:

• VCC/GND: Power supply pins (3V-5V). Always connect VCC to the positive rail and GND to ground.
• REC (Record): Input pin. Drive high to start recording and drive low to stop.
• PLAYE (Playback Edge): Edge-triggered input. Pulling this pin low initiates full message playback once.
• PLAYL (Playback Level): Level-triggered input. Pull this pin low to initiate and maintain message playback until the pin returns high.
• FT (Feed-Through): Allows the microphone signal to pass directly to the speaker output, useful for monitoring.
• P-L (Loop/Pulse): Output pin for indicating the playback status (Pulse mode) or message boundaries.
• SP+/SP−: Speaker connection terminals. You can connect a small 8 Ω speaker directly here.

Datasheet Reference:

• Download Winbond ISD1820 Voice Chip Datasheet

Commonly Used in:

• Toy Manufacturing: Adding custom voice commands, greetings, or sound effects to electronic toys and dolls.
• Educational Electronics: Used in learning kits and simple audio message projects for beginners.
• Prototyping Devices: Essential for quickly adding audio feedback or alerts to Arduino, Raspberry Pi, and other microcontroller projects.

Applications:

• Simple Voice Alarms: Triggering a recorded message upon a specific event (e.g., door opening, sensor activation).
• Customizable Greetings: Providing personalized welcome messages for entry systems or interactive displays.
• Audio Tags: Labeling exhibit items or objects with recorded explanations.
• DIY Intercoms: Creating basic, short-range communication systems.

Equivalent Models:

• ISD1700 Series: While offering longer recording times and more features, this series utilizes the same core technology and architecture as the ISD1820.
• APR9600: An older, functionally similar voice recording solution, however, it generally provides lower fidelity and shorter recording options.
• ChipCorder Solutions (Nuvoton/Winbond): A broad family of voice playback ICs that offer scalable recording lengths and features, serving as functional replacements.

Package Includes:

• 1 x ISD1820 Voice Recording Module
• 1 x Detachable Speaker (Typically 8 Ω, 0.5 W)