Circuit Schematics Diagrams and Projects

Digital Voice Record and Playback Project by ISD2560P

Digital Voice Record and Playback Circuit Schematic

Description

This project is based on ISD2560P IC which allows you to record 60 seconds voice and then playback it with very high quality. As shown in the schematic, the input soruce is an electret microphone. If a dynamic microphone is used,  R2,R3,R4 resistors and C3,C5,C7 capacitors will be omitted and microphone will be connected to the 17 and 18 numbered pins directly. Since it has better frequency response, we choose electret microphone in this project.

Digital Voice Record and Playback Circuit Schematic Controlling the circuit is very simple. Sw1 switches between record and playback modes. Push button B1 is used for start and pause functions. B2 stops the process.

To record voice, first move Sw1 to the record position and then push B1 once. IC will start recording and during this process red LED will bright. One push to B1 pauses and second push continues recording. You can record 60 seconds by this way. To stop recording push B2.

To listen the voice recorded before, move Sw1 to playback position then push B1. During the playback process red LED will bright again. One push to B1 pauses and second push continues playing. To stop playback push B2.

Click here to download PCB and Layout Files

There are some other operating modes for ISD2560P. Mode choice is done by the 7 numbered pin of the IC. For instance if you want to play the voice repeatedly, 7 and 4 numbered pins must be connected to +5V. Another mode is recording and playing only during pushing B1 button. To switch this mode, connect the only 6 numbered pin to +5V.Supply Part

Supply voltage of the circuit is +9V that is supplied by a 9V battery or 9V AC/DC adapter.But since ISD2560P requires +5V, we use a voltage regulator in our circuit. You can see the supply part of the circuit based on 7805 regulator in the figure.

 ISD2560P IC includes an amplifier to drive a 16 OAmplifier Parthm speaker but the output volume is not sufficiently enough. So instead of a 16 Ohm speaker, an amplifier circuit must be connected to the output. You can see the amplifier part of the circuit based on LM386 in the figure. SP+ and SP- pins must be connected to 14 and 15 numbered pins of ISD2560P. A 100K potentiometer is used to adjust the output volume. If the output of the amplifier is connected to a 8 Ohm speaker, then much higher volume will be taken.

Y.Erol

Comments (14)

Matthew Bumbalough
Is there any way to add something like a memory card socket to extend the recording time. For example, maybe adding a 1Gig SD card for the recorder to save the file to? That would be perfect for this project.

Thank you,
Matt
s.h.
By using the data pins of the ISD, you can read the recorded data and by using an external microcontroller it is possible to write this data to a SD card. But I am not sure that you can do the recording and reading process at the same time. You should read the operation modes of the ISD2560 carefully and find out.
Inuwa Jika
So much interesting
Tomas
I need to record audio from a PC, how is the conection?

Thanks
Hi
Once I tried to record audio from pc but pc audio output made so much noise. when I tried by using a mp3 player sound quality was good. I dont remember how I did the connection but you have only two options try this two different ways of connection.
Telmo
-->>> i just need someone to help me ... i tried to remake the initial diagrame but with a speaker of 8 ohm and wire instead of button and interrupters but that doesn't work! someone can explain to me if a can do it or not... i've got an university's project to do! thanks!
patrick garcia
I want it to be extended for at least 2 hours of recording especially during meetings, how will it be possible to do that?
Yuri
Hi.. since its digital.. Is there any programming involved in your design?
Yuri
If yes.. can you post it. so That I can see the program?
mikki moore
is this also applicable with higher impedance of speakers? at what extent can it be tolerable?
Sanjay
this is very good project.
B.K.Romine
Sorry, this is not true digital because all the digital effects are internal and you would not be able to connect to an SD card, anyway!

A one IC with external digital output (serial OK,too)would be more appropriate.
shanaka
is there any way to insert a mp3 sound clip of maximum length of 6 seconds?
With out Recording via the microphone
please give i need to konw.wanna help from u
John
does anyone know how to work this thing at all. I have literally built this 20 times and all i get for sound is a 1 second blurr and the led goes on and off as it pleases. So if anyone could give me a clue such as what pins i need just to make a 60 second recording that would be great because what i am doing is not working.

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