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ISD1820 Voice Recording & Playback Module with Mic and Speaker

Specification	Details
Operating Voltage	3V to 5V DC
Recording Duration	8 to 20 Seconds (Adjustable)
Main Chip	ISD1820
Speaker Drive	0.5W 8Ω (Direct Drive)
Interface	Push-button or Microcontroller (TTL)
Dimensions	38mm x 42.5mm
Sample Frequency	3.2kHz to 8kHz

Price

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₹ 165.25

(Tax included)

बारकोड: 8039480

Product Description

The ISD1820 Module provides a simple "true-to-life" voice capture experience. It consists of a driver PCB with three primary control buttons: REC (Record), PLAYE (Edge-triggered Play), and PLAYL (Level-triggered Play). The module utilizes a CMOS-based recording chip that requires no external programming or complex software libraries to function. Simply supply 5V, press the record button, and speak into the onboard high-sensitivity microphone. It also features a "Pass-Through" mode, where the microphone signal is amplified and sent directly to the speaker in real-time.

Key Features

Standalone Operation: Can be used completely without a microcontroller using the onboard push-buttons.
Non-Volatile Storage: Uses high-quality flash memory to store the voice message for up to 100 years without power.
Adjustable Sample Rate: By changing a single resistor (ROSC), you can trade off recording time for higher audio quality.
Direct Speaker Output: Features a built-in power amplifier capable of driving the included 0.5W speaker without extra components.
Dual Playback Modes: Supports both "Play Once" (Edge) and "Play while held" (Level) logic for flexible integration into interactive projects.

Technical Details

Control Pins: REC, PLAYE, PLAYL.
Feedback: Onboard LED lights up during the recording process.
Connectivity: Standard 2.54mm headers for VCC, GND, and Control signals.

Prototyping and Engineering Tips from Robogears

The Quality vs. Time Trade-off: The default 100kΩ resistor (ROSC) gives you 10 seconds of recording at an 8kHz sample rate. If you need a longer message (up to 20 seconds), you can replace it with a 200kΩ resistor, but the audio will sound noticeably "muffled" due to the lower 3.2kHz sample rate.
Microcontroller Control: To trigger this with an Arduino, connect the PLAYE pin to a digital output. Set the pin to HIGH for a brief moment to start the playback. Ensure your Arduino and the ISD1820 share a Common Ground.
Reducing Noise: If your recording has a "hissing" background noise, ensure your power supply is clean. For best results, use a 100µF decoupling capacitor across the module's VCC and GND pins to filter out electrical interference from other components.
Loop Playback: You can create a continuous loop by connecting the "Done" signal (available on some versions) back to the PLAYE pin, or simply use your code to trigger the PLAYE pin at regular intervals.

Package Includes

1 x ISD1820 Voice Recording Module
1 x 0.5W 8Ω Small Loudspeaker
1 x Speaker Connection Cable

Disclaimer

Do not use a speaker with an impedance lower than 8Ω, as this may draw excessive current and damage the ISD1820 chip. The onboard microphone is sensitive; avoid recording in high-wind or high-vibration environments for better clarity.

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