Engineers Garage

  • Projects and Tutorials
    • Electronic Projects
      • 8051
      • Arduino
      • ARM
      • AVR
      • PIC
      • Raspberry pi
      • STM32
    • Tutorials
    • Circuit Design
    • Project Videos
    • Components
  • Articles
    • Tech Articles
    • Insight
    • Invention Stories
    • How to
    • What Is
  • News
    • Electronic Products News
    • DIY Reviews
    • Guest Post
  • Forums
    • EDABoard.com
    • Electro-Tech-Online
    • EG Forum Archive
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • EE Resources
    • DesignFast
    • LEAP Awards
    • Oscilloscope Product Finder
    • White Papers
    • Webinars
  • EE Learning Center
    • Design Guides
      • WiFi & the IOT Design Guide
      • Microcontrollers Design Guide
      • State of the Art Inductors Design Guide
  • Women in Engineering

Voice Recorder and Playback Circuit

By D.Mohankumar

With this circuit, you can record your voice and play back the same for 20 seconds. The voice recorder circuit is ideal for door phones, automatic answering devices etc. APR 9301 is used in the circuit which is a data storage and retrieval IC without any micro controller programming.

Voice Recorder
 
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.
 
APR9301 IC
 
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.
1.         R1 52K 20 Sec.
2.         R1 67 K   24 Sec
3.         R1 89 K   30 Sec.
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.
  
Standby Mode
After completing the Record or Play back function, the IC will enters into the standby mode.
 
Sampling frequency
20 Sec 6.4 KHz
24 Sec 5.3 KHz
30 Sec 4 KHz
28 Pin IC requires IC base.
 
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
 
Play back
Close S2. Recorded message will be heard from the speaker. Use a 2 inch 8 Ohms speaker.
Power supply 5 Volt regulated supply or 6 volt battery.

 

 

 

Circuit Diagrams

Voice-Recorder-and-Playback_0

Project Datasheet

https://www.engineersgarage.com/wp-content/uploads/2019/10/apr9301-datasheet.pdf



Filed Under: Electronic Projects

 

Questions related to this article?
👉Ask and discuss on EDAboard.com and Electro-Tech-Online.com forums.



Tell Us What You Think!! Cancel reply

You must be logged in to post a comment.

HAVE A QUESTION?

Have a technical question about an article or other engineering questions? Check out our engineering forums EDABoard.com and Electro-Tech-Online.com where you can get those questions asked and answered by your peers!


Featured Tutorials

  • PS2 Keyboard To Store Text In SD Card Using Arduino Circuit Setup On Breadboard
    How To Use PS2 Keyboard To Store Text In SD Card Using Arduino- (Part 42/49)
  • Wireless Path Tracking System Using Mouse, XBee And Arduino Circuit Setup On Breadboard
    How To Make A Wireless Path Tracking System Using Mouse, XBee And Arduino- (Part 43/49)
  • How to Make a Wireless Keyboard Using Xbee with Arduino- (Part 44/49)
  • Making Phone Call From GSM Module Using Arduino Circuit Setup On Breadboard
    How to Make Phonecall From GSM Module Using Arduino- (Part 45/49)
  • How to Make a Call using Keyboard, GSM Module and Arduino
    How To Make A Call Using Keyboard, GSM Module And Arduino- (Part 46/49)
  • Receiving SMS Using GSM Module With Arduino Prototype
    How to Receive SMS Using GSM Module with Arduino- (Part 47/49)

Stay Up To Date

Newsletter Signup

Sign up and receive our weekly newsletter for latest Tech articles, Electronics Projects, Tutorial series and other insightful tech content.

EE Training Center Classrooms

EE Classrooms

Recent Articles

  • Renesas delivers intelligent sensor solutions for IoT applications
  • Microchip Technology releases AVR-IoT Cellular Mini Development Board
  • Qualcomm acquires Cellwize to accelerate 5G adoption and spur infrastructure innovation
  • MediaTek’s chipset offers high-performance option for 5G smartphones
  • Nexperia’s new level translators support legacy and future mobile SIM cards

Most Popular

5G 555 timer circuit 8051 ai Arduino atmega16 automotive avr bluetooth dc motor display Electronic Part Electronic Parts Fujitsu ic infineontechnologies integratedcircuit Intel IoT ir lcd led maximintegratedproducts microchip microchiptechnology Microchip Technology microcontroller microcontrollers mosfet motor powermanagement Raspberry Pi remote renesaselectronics renesaselectronicscorporation Research samsung semiconductor sensor software STMicroelectronics switch Technology vishayintertechnology wireless

RSS EDABOARD.com Discussions

  • Tuning the antenna to be conjugately matched to input impedance of the die
  • about ATmega328 ADC pins
  • Netlist physical name update
  • nt1065_USB3 gnss receiver
  • LLC HB with synchronous rectifiers can be very dodgy?

RSS Electro-Tech-Online.com Discussions

  • PC/laptop working and processing so much harder when data is low quality
  • undefined reference header file in proteus
  • Capacitor to eliminate speaker hum
  • Decapped Chip On Board
  • Sony KV-A2913E (chassis AE1C) auto shuts off after one minute
Engineers Garage
  • Analog IC TIps
  • Connector Tips
  • DesignFast
  • EDABoard Forums
  • EE World Online
  • Electro-Tech-Online Forums
  • Microcontroller Tips
  • Power Electronic Tips
  • Sensor Tips
  • Test and Measurement Tips
  • 5G Technology World
  • About Us
  • Contact Us
  • Advertise

Copyright © 2022 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search Engineers Garage

  • Projects and Tutorials
    • Electronic Projects
      • 8051
      • Arduino
      • ARM
      • AVR
      • PIC
      • Raspberry pi
      • STM32
    • Tutorials
    • Circuit Design
    • Project Videos
    • Components
  • Articles
    • Tech Articles
    • Insight
    • Invention Stories
    • How to
    • What Is
  • News
    • Electronic Products News
    • DIY Reviews
    • Guest Post
  • Forums
    • EDABoard.com
    • Electro-Tech-Online
    • EG Forum Archive
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • EE Resources
    • DesignFast
    • LEAP Awards
    • Oscilloscope Product Finder
    • White Papers
    • Webinars
  • EE Learning Center
    • Design Guides
      • WiFi & the IOT Design Guide
      • Microcontrollers Design Guide
      • State of the Art Inductors Design Guide
  • Women in Engineering