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  • APR 9301 is a single chip Voice recorder and Playback device for 20 to 30 seconds voice recording and play back. It is an ideal IC for automatic answering machine, door phones etc. This IC has data storage capacity and requires no software and microcontroller. It provides high quality voice recording and play back up to 30 seconds.

    The IC requires minimum components to create a voice recorder. The IC has non volatile flash memory technology with 100K recording cycles and 100 year message retention capacity. The IC utilizes the Invox proprietary analog / multi level flash non volatile memory cells that can store more than 256 voltage levels. It requires a single 5 volt supply and operates in 25 mA current.

    APR 9301 Voice Recorder Circuit

    Mode of operation

    1. Record Mode
    The LED glows when the IC records the voice obtained through the Mic. A single voice message up to 20 seconds can be recorded. The IC remains in the recorded mode as long as the RecL pin 27 is grounded. Recoding will be terminated with the last memory when 20 seconds is over. The Speaker driver will automatically mutes in the recording mode. By changing the value of the OscR resistor R1 it is possible to increase the recording period as follows

    A. R1 52K 20 Sec.
    B. R1 67 K 24 Sec
    C. R1 89 K 30 Sec.

    APR 9301 IC

    2. Play back Mode
    By pressing the play back switch, the play mode starts from the beginning of the message. The input section will be muted during play back.

    3. Standby Mode
    After completing the Record or Play back function, the IC will enters into the standby mode.

    4. Sampling frequency

    A. 20 Sec 6.4 KHz
    B. 24 Sec 5.3 KHz
    C. 30 Sec 4 KHz

    5. 28 Pin IC requires IC base
    6. Recording
    Press ,switch S1 and speak through the Mic or record music. LED will glow in the recording mode. Open S1 after recording. Use a small condenser Mic

    7. Playback
    Close S2. Recorded message will be heard from the speaker. Use a 2 inch 8 Ohms speaker.
    8. Power supply 5 Volt regulated supply or 6 volt battery.

    APR 9301 Voice Recorder Assembled

    attentionThe author D Mohankumar is not an active member anymore. Please take into consideration that the presented information might not be correct.
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    10 Responses to "APR9301 Voice Recorder"

    1. Mark Smith says: on September 23, 2010 at 7:42 pm

      are these ICs available? If so, where? Thx

    2. azeem mumtaz says: on December 28, 2011 at 4:34 pm

      this IC is available at least in Pakistan.
      I have got it at coast of 300/-.
      I am making speech recorder pray that there will no problem!
      frm: University of Engineering and Technology,Lahore
      (Faisalabad Campus)

    3. jagadeesh says: on March 28, 2012 at 2:26 pm

      Is this circuit is working fine???
      Because i have connected all components as same as above but it’s not working…
      Is the circuit after the micro phone is must??

    4. Does anyone know where I can find the drawing at online, Im etching the board myself.Thanks

    5. Muzammil imdad says: on January 10, 2013 at 5:00 am

      where can i get this IC from in pakistan…………..anyone plz help me out…

    6. APR9301 available in hallraod lahore. working circuit available also.

    7. is there any technique to erase the circuit?

    8. if i record to 8 different sound,how long the duration for each can record?

    9. can you suggest a simulation software for this

    10. is it possible to give line in audio instead of a microphone, and is there any bigger size IC, which can record more than 2-3 minute.


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