APR9301 Voice Recorder Circuit

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

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


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