ISD1820 Voice Recording and Playback Module

The ISD1820 is a compact, single-chip voice recording and playback module that brings true audio capture and non-volatile storage to Arduino, micro:bit, and other microcontroller projects. Built around the ISD1820 record/playback IC, it supports up to 10 seconds of default recording time (adjustable to 8–20 seconds via the ROSC resistor) and stores audio without battery backup. The onboard electret microphone captures sound directly, while the integrated 8Ω 0.5W speaker delivers clear playback; an external speaker up to 3W can also be connected for louder output. Three tactile buttons (REC, PLAYE, PLAYL) and two DIP switches (REPEAT and FT) let users record, play once, loop continuously, or use the feed-through mode for real-time microphone-to-speaker passthrough. The module operates from a 3–5V DC supply, draws about 60mA during recording or playback, and provides a maximum output power of 0.3W. Its 54mm × 38mm × 16mm PCB includes 3mm mounting holes for easy installation, and the 3-pin header allows direct control from a microcontroller. This voice recording playback module is ideal for interactive exhibits, security alerts, talking toys, and educational demonstrations that need a simple ISD1820 sound module with reliable record-and-play functionality.

Application

1. Interactive exhibits, museum displays, and educational demonstrations with triggered voice messages.
2. Security systems, alarms, and warning devices that play recorded alerts.
3. Talking toys, greeting cards, and novelty products with short repeatable voice clips.
4. Smart home notifications and elevator or access-control announcements.
5. Arduino and microcontroller projects requiring a standalone record-and-playback sound board.

Specifications

1. Model: ISD1820
2. Function: Voice recording and playback
3. Supply voltage: 3V to 5V DC
4. Working current: 60mA (typical)
5. Maximum output power: 0.3W
6. Default recording time: 10 seconds (adjustable 8–20 seconds via ROSC resistor)
7. Sampling frequency: 6.4kHz default (adjustable 3.2–8kHz)
8. Onboard microphone: Electret condenser
9. Onboard speaker: 8Ω, 0.5W, 4cm diameter
10. External speaker support: Up to 3W (8Ω)
11. Control interface: 3 tactile buttons (REC, PLAYE, PLAYL) and 2 DIP switches (REPEAT, FT)
12. Microcontroller interface: 3-pin header (VCC, GND, control signal)
13. Mounting holes: 2 × 3mm diameter
14. Dimensions: 54mm × 38mm × 16mm (length × width × height)
15. Weight: 14.8g
16. Operating temperature: -25°C to +65°C
17. Compliance: ROHS