voice recording chip

[sienz]

hi all,
i need help in understanding this circuit.//
can anyone help me out?

 

[Nigel Goodwin]

Have you downloaded the datasheet for it?.

 

[Gayan Soyza]

Why look into pictures why not reading the notes.

The data sheets do wonders the same circuit & colurs has in the data sheet.

Read that it has more informations than you expect.

 

[sienz]

i downloaded the datasheet and went through it before this.
but, i do not quite understand how the circuit works as much as i want to
for example, what is the purpose of placing the capacitor C4, C3 and R4 there..
also, the switches S1, it's a push-to-make switch right?
does that mean that if i press once, it will start, and paused when pressed again?
please help.....

 

[ericgibbs]

i downloaded the datasheet and went through it before this.
but, i do not quite understand how the circuit works as much as i want to
for example, what is the purpose of placing the capacitor C4, C3 and R4 there..
also, the switches S1, it's a push-to-make switch right?
does that mean that if i press once, it will start, and paused when pressed again?
please help.....

hi,
C3 is the ac coupling from the preamp to the main amp and conjunction with R4 form a simple frequency filter.

C4 is the voltage bias filter for the electret microphone.

R6 is a pull up resistor for the switches.

S1 is a 'start' push switch.

Select Playback or Record, then the 'Chip enable' ,,,, 'start' to record or replay.

S1? is a 'stop' push switch, stops Record or Playback and resets the ic ready for your next command. Look at page 8 of datasheet.

Note: the datasheet circuit and the one you have posted have different component idents!

I have read the datasheet and ALL you want to know is in there.

 

[Hero999]

It seems like you need more experiance before you build a circuit like this.

 

[sienz]

First of all, sorry for this very late reply.
Second, thank you to all who replied to this thread.
I have another question.
I built the circuit according to the schematic provided in the datasheet.
Now, it works fine.
The problem is this, my speaker output is too soft.
By soft, I mean that the voice recorded is too soft to be heard but on the other hand, the noise from the background is too loud.
By the way, I placed a low voltage audio amplifier between the output pins and the speaker.
What should I do to reduce the noise while making the voice audible?
I was thinking of using a low-pass filter to filter out the noise.
If that is the case, what cut-off frequency should I use?