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Description: This is a breakout board for the ISD1932, a multiple-message record/playback device. This single chip can record up to 64 seconds worth of voice messages. Microphone inputs and speaker outputs are all handled by the ISD1932.

A switch is connected to allow selection of the ISD1932's operating mode - address trigger or direct trigger. You must cycle the power after switching the mode. An LED is also populated on the board and will illuminate when the device is recording. An external resistor is necessary to select the record duration and sampling frequency, which can range from 21.2 - 64 seconds (4-12kHz sampling frequency).

The board breaks out all pins of the ISD1932 to 0.1" spaced headers. This product comes as shown in the pictures with filtering capacitors, an LED, mode selecting switch and the ISD1932 IC. The new version of this board also includes a microphone and a 3.5mm audio jack.

Features:

  • Operating mode selector switch
  • 2.4V to 5VDC supply voltage
  • LED indicates if the board is recording
  • Record up to 64 seconds of audio
  • All pins of the ISD1932 broken out to 0.1" headers
  • Breadboard friendly

Documents:

Replaces: BOB-09579

Comments 16 comments

  • This board was excellent for trying to help my brother who has aphasia. Please see the short video clip. Wish I had recorded the audio better as this board produces excellent audio; I choose the configuration resistor for maximum fidelity.

    I’m surprised that there seems to be nothing on the market for people with expressive aphasia. It would be easy to make a box with 8 short messages.

  • I want to use the sound module without a controller – can I get the audio to loop? I need to have it run constantly. Thanks joel

  • Thanks to a lot of the comments here, I used this in my Halloween project this year. The complete writeup, including wiring diagram is on my blog:http://baldwisdom.com/electrify-your-halloween-making-things-scream/ I also started a simple arduino library for it: https://github.com/osbock/ISD-library

  • There is a tutorial online on using the ISD1932 breakout board right here => http://ianlangelectronic.webeden.co.uk/#/voice-recorder/4562321245

  • I have this board working where I can record a message (@ 3.5v, direct mode, single message, 150k ohm Rosc). I can only record if the line out jack is not connected (no biggie, but might help others looking at this board). I can start & stop play, no problem. But the 1932 spec sheet says feed-through only for single ended audio! The board had a differential mic glued down. I can’t get feed-through to work. Is it because the differential mic is present? Has anyone gotten feed-through to work with this board? Do I need to lift the capacitors and solder down a single ended mic to get feed-through to work? If so, this should still allow muxing between the recorded audio and the single ended mic? So close to finishing my project! Any help is very much appreciated! :-)

    • Sorry, this is actually a single-ended mic. A closer look at the schematic shows that the “negative” leg of the mic is tied to “LED” which is an output of the 1932. “LED” is active low so when recording (the red LED is lit), the mic operates like a single-ended mic. But when not recording, the mic is ineffective because “LED” is driving high…which is why it doesn’t work in feedthrough mode.

  • Has anyone created a wiring diagram to make this board work? Perhaps a description of the pinout from the board? I’m hoping to create a voice module with best quality audio, one message, of 20 seconds duration. Thanks! John

  • We ordered there and were so sad that we could not find an elegant way to solder our own external mic. May I suggest a couple of through-hole points on the mic-connections, coupled with designated places to cut the traces for the built-in mic?

  • I have used this chip a few times and it does have the ability to sound much cleaner than the sample recording here. I am not sure what the sample frequency is that the sample is, but a single resistor change with this part can increase or decrease the frequency… just look at the datasheet for the chip. Also, the LED pin should be connected to the microphone input, it is a technique they use to disable the microphone when its not in record mode.

  • Has anyone gotten this to work? I have one, but I can’t seem to get it to record. Feedthrough mode doesn’t work (tying it to low doesn’t output the audio to the speakers). And the LED pin is always on.

  • Do you have any of the old ones left? I built some circuits around the pinout from that one, and need at least 2 more of the old-style one…

  • On the schematic, it looks like part of the mic circuit is tied to the LED pin? Is this intended?

  • That recording sounds pretty terrible. I’m sure it’s possible to get better samples, but wow.

  • I have the previous version of this one and it sounds very clean (I have been recording directly from MP3 player’s headphone output).


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