3188 - 40 Second Message Recorder (ISD1740)

Feature packed non-volatile 40 second multi-message sound recorder module using a high quality ISD1740 by Winbond. Standalone operation using just six onboard buttons or the onboard SPI interface. Record using built-in microphone or external line in. Speaker and analogue AUX outputs. Wide 8-24 V dc operating voltage. Adjustable sampling frequency.

These chips are designed for operation in either standalone or microcontroller (SPI) mode. This kit provides interfaces for both.

Onboard controls for RECORD, PLAY, VOLUME, ERASE, FORWARD, RESET and LINE/MIC input selection. Selecting a different message will override the currently playing message.

The sampling frequency (message length) can be adjusted from 4 to 12 kHz (80 - 24 seconds) by changing one onboard resistor value, giving greater flexibility in duration versus recording quality.

Recordings are stored in on-chip Flash memory, providing non-volatile storage when power is removed. The audio data is stored directly without digital compression, which provides better quality voice and music reproduction.

Technical Specifications
Operating Voltage	8 to 24VDC (see User Manual for details)
Sampling Frequency	8 kHz default (see User Manual for details)
Message Length	40 seconds @ 8 kHz (see text)
Standalone Mode	Yes
SPI Mode interface	Yes
Input Sources	Onboard electret microphone or Analogue Line In
Outputs	Direct drive to 8 ohm speaker Analogue Aux Output
Visual Indicator	Onboard LED: Stays ON during recording BLINKS during playback, etc.
Board Dimensions	52 x 70mm
Board Connections	Power socket, 3.5mm mono audio jacks, screw terminal blocks and solder pads
Product Format	Electronic Kit (KT ) or Assembled (AS) more
Documentation	User Manual