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The article explains a single chip circuit which can be used for recording and playing back short voice clips or any audio clip ranging from 20 to 60 seconds. The recording or storage of the audio can be done through an integrated electret mic or via any line out or RCA port of an audio reproducing device.
However since the IC is a low bit device does not support Hi-Fi recording rather low quality music.VOICE RECORDING AND PLAY BACK APR33A3
The sampling rate or the frequency response is limited to just 8 kHz max that's pretty ordinary if we compare it with the specs of modern Hi-Fi equipment. Nevertheless, the IC is a stand alone device which does not depend on any external circuits, just plug it in, and it starts recording whatever voice data is fed across its input pins. It's a 28 pin IC which can be very easily and quickly configured for getting the required results by adding a handful of common passive electronic components.
For example pin 28 and pin 27 are assigned as the trigger inputs for initiating playback and recording functions. The IC also has appropriate visual indication options which provide the user with instant information regarding the position of the circuit. The LED at pin 10 stays illuminated for so long the audio is being played, indicating circuit "busy". The LED at pin 22 indicates through rapid flashes regarding the playback or recording modes of the IC.
The input data is normally picked from the mic which is appropriately connected across the pins 17 and 18 of the IC.
The sampling rate of the IC can be set as per the user preference. Longer periods would also mean lower voice quality while shorter periods of recording spec will produce relatively better sound processing and storing.
The audio output may be derived across pin 14 and ground which must be terminated to an audio amplifier so that the data can be heard with proper volume. The IC ISD is a device which features a single chip audio message recording and playback facility, and is able to retain the audio message in it infinitely even while the chip in the un-powered state.
This also causes the chip to go into a power down condition or in the standby condition. In the PLAY E or edge activated mode, a single press and release or a momentary press of the button will initiate the playback of the recorded clipping through the speaker, and will end as soon as the internal EOM end of message signal gets activated.
The PLAY L mode is activated when the attached button is pressed and held pressed without releasing it.
Arduino (Mega) Audio Recording
The audio playback now continues as long as the button remains depressed, or as soon as the internal EOM is activated. Keeping the button permanently pressed will cause a higher current consumption of the IC. The FT input signal is responsible for controlling the feed through mode of the chip.Adding sounds or music to our project will always make it looks cool and sounds much more attractive. Especially if you are using an Arduino and you have lots of pins free, you can easily add sound effects to your project by just investing in an extra SD card module and a normal speaker.
Thanks to the Arduino community who have developed some libraries to build this in a fast and easy way. We have also used IC LM here for amplification and noise cancelation purpose. For playing sounds from SD Card using Arduinowe need audio files in. To make an arduino mp3 playerthere are a lot of mp3 shields are available which you can use with arduino.
Step 2: Arduino can play a wav file in the following format. You can toy around with the settings later, but these settings were experiment to be the best in quality.
Then feed in the above settings. Once done it should look something like this in the below image. Wav file format. It will also be downloaded once the conversion is done. Step 5: Finally format your SD card and save your.
Make sure you format it before you add this file. Also remember the name of your audio file.
Similarly you can select any of your four audios and save them with names 1, 2, 3 and 4 Names should not be changed. I have converted four songs and have saved them as 1. The complete circuit diagram is shown in the Image below. As we know our audio files are saved into the SD card, hence we interface a SD card reader module with our Arduino.
It is further listed in the table below. Now the Arduino will be able to read the music file from the SD card and play it on the pin number 9. But the audio signals produced by the Arduino on pin 9 will not be audible much. The amplifier shown above is designed for a Gain of and the Vdd pin 6 is powered by the 5V pin of the Arduino.
Voice recorder/playback circuit
It can withstand a maximum of 15V. Learn more about this gain amplification configuration for LM here.Add the following snippet to your HTML:. Record your voice using Arduino and ISD Project tutorial by gadgetprogrammers. I was juggling the internet to find devices which record voice and play it again. I require to control this device using Arduino, I mean recording and playing voice through Arduino only.
This project is just for beginners and for those who want to learn about the functioning of ISD with Arduino, but you can extend it to very big sense. You should visit www. Firstly, we just record voice through ISD, which can record 20 seconds for once you can store voice in sd card tooand you can play it again and again.
You can record voice and store it in SD Card for future purpose and you can create walkie talkie and more Please visit and promote us so that we can build new projects for you www. Please log in or sign up to comment. Project tutorial by Patel Darshil. Hello peepz, I created a little laser alarm from a laser Emitter and a Laser receiver. I used the ky laser. Project tutorial by Danny van den Brande. Project tutorial by Gadget Programmers. Project tutorial by Austin Wilson. It is a simple tutorial on how to create little a security device using an Arduino.
Sign In. My dashboard Add project. Project tutorial. The Idea Behind It! How It Works! So this was the whole working of our system.
Team gadgetprogrammers anshulpareek 6 projects 78 followers Follow. Respect project. Similar projects you might like.This project is a 60 seconds voice record — playback module. Voice Module 60 Sec project will playback and record up to 60 seconds of voice message.
This circuit will help you record and play a 60 seconds voice message stored on it. The project provides four different modes of voice message to be recorded and played, viz i MOD8 : 60 Seconds is equally dived in 8 equal segments, ii MOD4 : 60 Seconds is equally divided in four equal segments, iii MOD2 : 60 Seconds is equally divided in two equal segments and iv Tape Mode : Entire 60 segment is available in a single shot mode. There are two different ways to record a voice message onto the chip viz.
Jumper J3 on the PCB to select audio source. Onboard preset PR1 will adjust the sampling rate of playback and record option for IC. Important thing to remember is that, if you increase the sampling rate, the duration of message will reduce and vice-versa. Also select the source for recording through CN1 Connector. Keep the sampling rate preset PR1 in the middle position to test a sample of the recorded message. Increasing the sampling rate will decrease the total amount of recording time and vice-versa.
To record a message in any on of this location, you need to keep the Record Switch SW10 pressed with one finger and the Segment Switch pressed.
A Pip sound will play through the speaker to denote recording start. Recording will end when you release both these keys and when it reaches the end of the segment. Another PiP would sound to denote the end of recording. Switches marked M1 to M8 are available in this mode.
Playing a Message: Connect a appropriate speaker should not lower than 8 Ohms at LS1, For playing a recorded message you just need to press and release any of the switch available in that particular mode once. The play of message is also indicated by the flashing of LED, D2. Parts List. My requirement is to record four different sound in one circuit and play any one sound when i want. Hi, I am making miniature railway model and I need similar circuit in which I can play pre-recorded horn by pressing button.
Can you help me? Once the ic starts playing will it be playing again and again itself or it will stop after playing the recorded music 60 sec. According to the datasheet, if you press and hold the message button M1-M8 the message is replayed repeatedly. To achieve this mode J1 and J2 should be closed. Electronics Lab. Manzoor Ahmed. Shantanu Borate. This project would be a great fit for your railway model.
How can i help you?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 is used in the circuit which is a data storage and retrieval IC without any micro controller programming. The IC requires minimum components to create a voice recorder.
The IC has non volatile flash memory technology with K recording cycles and year message retention capacity. It requires a single 5 volt supply and operates in 25 mA current. Mode of operation. Record Mode.
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. R1 52K 20 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. 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. Connect with Engineers Garage on Social Media. Search Engineers Garage.Digital and Analog is an integral part of Electronics. Also the real world signals like sound and light are analog in the nature, so whenever these real world signals have to be used, the digital signals have to be converted to analog, for example PIC microcontrollers can be used to connect to the legs of metal coins used as key microcontroller with ADC circuit 36 is used for touch-key The melody has 5 audio circuit, made with pic16f84a American police sound ambulance siren, the alarm sound, the sound of Morse code, according to a previous 32 tune Melody a simpler design.
LSI can be driven directly speakers also, in view of the lack of volume, only added to the Making an audio player. In this project I used a wave file with sample rate of Hz and 2 channels stereo. The file I used originally it was an MP3 fi The WAV audio file used in this project is Hz, 8-bit stereo 2 channels.
Speaker 20 MHz crystal oscillator 2 x 22p This post describes the design and construction of a 3-phase loudspeaker intended for Leslie Speaker emulation. The unit is intended to be driven by a 3-channel audio amplifier The Brute, which in turn is controlled by LEMS, a micro-controller based control system, the construction of which both are described in companion posts. Connections The following table documents the connecting leads and molex pin-header numbers tying the various interfaces together.
Header Pin no. A Cho This project uses a microcontroller to drive a speaker and play one of two songs: Yakety Sax the chase song from the Benny Hill Show and Entrance of the Gladiators the clown juggling unicycle song. The tunes are stored as a series of distinct notes. The frequency and duration of each a note is sent to a function. A square wave is generated based on the inputs. The nice thing about this is it can be c Thank you Your feedback has been received.This circuit is designed in response to a request made by Mr Vignesh.
What he requested was a circuit for recording and playing voice. I think this circuit is enough for the purpose. The chip can record voice for 20seconds and has many features like automatic gain control, anti aliasing filter, built in audio amplifier and smoothing filter.
The IC is fully compatible to microprocessors and can be used for a myriad of applications. The voice is stored in their natural form in the non-volatile memory cells inside the IC which enables a high quality reproduction.
The circuit is designed as per the application diagram in the datasheet. Pin23 CE is the chip enable pin and it has to be held low using switch S1 in order to perform a record or playback cycle. The selection can be done using the switch S3. The pin 24 PD is the power down pin. It has to be held high using switch S2 in order to pull the device to a extremely low power mode while there is no recording or playback idle state.
The resistor R5 and capacitor C5 connected across the pin 20 and pin 21 provides an additional cut-off to the low frequency end of the voice pass band. Circuit diagram. Audio circuits circuit diagram Author john. Sir, Please help me in designing a circuit which can play back a message to a duration of around 20 seconds from a chip which can be changed till when the user wants to stop from outside. This is intended for a new security system and requires somebody who can manufacture in bulk.
I want an amplifier circuit to enhance the output to a higher level. Can you please help me. Inside, the electronic part needs to be a voice recorder that repeats itselfs every 20 seconds until the repeat is cancelled by the user.
Also it should play the recorded sound or music on the scheduled date and time. Audio circuits circuit diagram. Author john. Frequency counter using arduino February 19, Motor speed control using arduino June 12, K G Radhakrishnan 2 years ago.
Eliot L. Sims 6 years ago.