APR9301 Voice Recorder

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


Join the conversation!

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  • jagadeesh

    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??

    • bullseye

      I just finished building this PCB and it doesn’t work for me either. The led is lit as soon as I apply power. Does anyone know what I am doing wrong. I followed the schematic exactly.

  • azeem mumtaz

    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)

  • Mark Smith

    are these ICs available? If so, where? Thx