Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Basic question about ISD2500 series

Status
Not open for further replies.
C

cincailo

Newbie level 6
Joined
Feb 14, 2009
Messages
12
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,375
isd 2500

Hi,

I bought a ISD25120 chip and then only I found out it is noisy and low sample rate (only 4KHz). But I wish to get output 8kHz which is much clearer, can I change the sample rate? How to change it? I should buy ISD2560 which can give me better output and 8kHz sample rate but unfortunately it is no more in the market.

Thank you.
 

isd 25120 example

Hi,

Actually how to manage it? I already connect all the things as in the application notes the circuit on breadboard but it seem no sound at all. Problem is I don't know whether is recording part got problem or the playing part got problem or because it is ISD 25120 with low sample rate so the output is too weak till I can't hear?

Do you know how to configure it?

I put a LED with a resistor then to GND at the !EOM pin, so actually it is light up when !EOM low? Confusing...

Thanks...


KMoffett said:
Check page 4: https://kitsrus.com/pdf/isd_2560.pdf

Doesn't look like you can.

Ken
Click to expand...
 

isd2500 datasheet

Data rate shouldn't have anything to due with output volume. Re check your circuit.

Winbond had an App Note for adding an amplifier. I couldn't find it, so have attached a Zip of the two PDF pages.

Ken
 

how to use isd25120

Ya, I know that the preamplifier and I did connect the speaker with preamplifier LM386 and then a 8ohm speaker. But seem no output at all. Voltage at the speaker area is 0V. Is it the EOM problem? Since in the datasheet it stated that need to wait for EOM to become low only start recording/ playback. EOM when low will light up LED that connect to it with a resistor? (EOM pin to resistor to LED to ground)

Ya, I use the electronic mic on my breadboard, is it I should use the headphone jet to transfer the voice file in the PC into it then only it will sound louder?

Thanks...


KMoffett said:
Data rate shouldn't have anything to due with output volume. Re check your circuit.

Winbond had an App Note for adding an amplifier. I couldn't find it, so have attached a Zip of the two PDF pages.

Ken
Click to expand...
 

buy isd2500

Since I dont have the application note, I don't know how you are set up. So, I can't help much at this point.

According to the data sheet you should be able to use an "electret" mic for the input. I only used the computer's "line output".

Ken
 

    C

    cincailo

    Points: 2
    Helpful Answer Positive Rating
manual isd25xx

Hi,

I thought you done with the ISD25xx before. Erm... According to the datasheet for push button mode, I should shift PD= low (!EOM low, LED doesn't light up) then change to P/!R = low to record (!EOM still low, LED still doesn't light up) then !CE pin= low, recording start (!EOM become high and LED light up). Until this point I get it.

Then when playback, my SP+ and SP- have voltage around 1.8V. Everything seems nice, but just don't have the voice out from speaker.




KMoffett said:
Since I dont have the application note, I don't know how you are set up. So, I can't help much at this point.

According to the data sheet you should be able to use an "electret" mic for the input. I only used the computer's "line output".

Ken
Click to expand...
 

isd25xx datasheet

I have not used the ISD25XX before...I used one of their other chips. Can you post a link and Figure/Page # for the circuit you are using?

Ken
 

isd2560 25120 application data

Really thanks so much. With attachment is the datasheet, I use the circuit example in page 30. Quite similar, except that I use LM386 with 8ohm speaker as in other set of its manual. Another part is I connect all the A0 to A9 address line to a pull down network, 10K resistor to 5V then to the slide switches (A0 to A9) then from the switches to ground. Any way, I already set all A0 to A9 to 0V, but I found out that either A6, A8 or A9 become 0V, the !EOM marker will light up LED. Ya, I also connect the !EOM pin to a resistor then to LED then to ground for indicator.


Besides that when in the playback mode, the speaker SP+ and SP- have around 1.5V. As well as the output pin of LM386. It seems so normal.

Note that EOM=OEM= End of marker



KMoffett said:
I have not used the ISD25XX before...I used one of their other chips. Can you post a link and Figure/Page # for the circuit you are using?

Ken
Click to expand...
 

isd-2500

The "pushbutton" Modes use the EOM marker and line. It is not necessary for direct addressing, because you will determine how long each message is and select your addresses accordingly. With A0 through A9 low, your message will start at the lowest memory location and fill the memory as long as you are in record.

I'm not sure what you mean about the 1.5V on the SP+, SP-, and LM386 output. Is this DC or AC (as in a signal)?

ken
 

isd2500 worked out examples circuit design

Now facing a problem at the EOM, end of marker, LED. As I put an LED at the EOM pin, it light up as long as there is power supply even if the chip is in power down mode. This make me feel so upset. Already check the circuit for many times, it really seem ok.
 

isd2500 push

Is the LED (through a resistor, hopefully) connected between the /EOM pin and +5, or between the /EOM pin and ground?

Ken
 

isd 2500

ya, is with the 1k resistor then to ground. I also found out the LED will light up whenever the address pin for A9, A8 or A6 is low. As long as either of them low, LED will light up. Really wonder why...

Thanks.

cincailo
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top