120s Audio Recording and Playback Module Chipcorder

Product Description:

This compact audio recording and playback module is ideal for DIY electronics projects requiring simple voice prompts or sound effects. Measuring just 30 × 28 mm, it offers up to 120 seconds of high-quality audio recording using Adaptive Differential Pulse-Code Modulation (ADPCM) compression, stored in an onboard 1 MB flash memory.

Key Features:

• Recording Time: Up to 120 seconds

• Audio Format: ADPCM compression

• Sampling Rate: 16 kHz max.

• Resolution: 14-bit

• Output Power: 0.6 W into 8 Ω

• Speaker Impedance: Supports 8 Ω to 32 Ω speakers

• Supply Voltage: 3.0 V to 5.0 V DC

• Standby Current: Less than 5 μA at 3.6 V

Control Functions:

The module features four control pads for push-button operation (connect to GN pad):

• RL (Record Level): Records audio while the button is pressed.

• RE (Record Edge): Starts recording on press; stops on second press or after 120 seconds.

• PL (Play Level): Plays audio while the button is pressed.

• PE (Play Edge): Starts playback on press; stops on second press or at end of message.

Recording starts with a short beep and ends with two short beeps, which are not included in the recorded audio.

Connections:

• Power Supply: Connect between B+ and GND pads.

• Speaker Output: Connect an 8 Ω to 32 Ω speaker between SPK+ and SPK− pads. Note: Outputs are floating and not referenced to ground.

• Microphone Input: Designed for direct connection of an electret microphone capsule.

Applications:

• Custom greeting cards with personalized messages

• Model trains or toys with realistic sound effects

• DIY security systems with audible alerts

• Educational projects requiring audio feedback

Usage Notes:

• The module's output utilizes pulse-width modulation (PWM) at approximately 2.7 MHz. When connecting to external amplifiers, use an isolation transformer (e.g., 600:600 Ω) to prevent ground loops and filter PWM noise.

• For optimal recording quality, especially from line-level sources, consider using a resistor divider or potentiometer to adjust input levels and prevent distortion.