Any idea about how this circuit work?

Discussion in 'Analog & Mixed-Signal Design' started by Stéphen Grosjean, Nov 21, 2018.

  1. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
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    Hi, I try to know what this circuit is about
    And how it work
    I think it’s a circuit for audio amplification, it has a TDA2822 chip in it.

    Mod: cleaned up your image.E

    tda1.jpeg
     
    Last edited by a moderator: Nov 21, 2018
  2. DickCappels

    Moderator

    Aug 21, 2008
    5,590
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    There is no schematic or other illustration accompanying your post. Other than to note that the TAD2822 was intended to be used as an audio amplifier, not other comment may be made about your circuit at this time.
     
  3. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
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    Well I don’t have a schematic other than the image itself that’s why I’m asking about it
    I’ll try to make a schematic out of the pcb
     
  4. bertus

    Administrator

    Apr 5, 2008
    19,704
    4,064
    Hello,

    When you do not have a schematic, you will have to trace out the board.
    The datasheet will give you information on the function of the pins.
    There are also some test schematics in there.

    Bertus
     
  5. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
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    I'm doing it right now, but any idea about the cables ? VDD VSS GND IN SP+?
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,436
    5,671
    This may be typical.
    Max.
    upload_2018-11-21_9-30-27.jpeg
     
  7. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
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    0
    Is this helping?
     
  8. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
    8
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    Oops made a lot of errors, here it's correct:
    Capture d’écran 2018-11-21 à 17.39.42.png
     
  9. JWHassler

    Active Member

    Sep 25, 2013
    272
    51
    The pin numbering in your schematic is wrong... 8 and 7 on your drawing should be 4 and 3

    Edit; so it's an audio amp with one channel unused
     
  10. crutschow

    Expert

    Mar 14, 2008
    22,532
    6,609
    Below is the 8-pin version pinout (looking from the top of the chip).

    upload_2018-11-21_8-41-42.png
     
  11. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
    8
    0
    I Know but it was easier to read reversed to the Pins are correct
    I know it's an audio AMP but what I don't know is what the cables are for ? VDD, VSS, SP+, GND, IN?
     
  12. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
    8
    0
    Thx, in my diagram the chip is from bellow
     
  13. DickCappels

    Moderator

    Aug 21, 2008
    5,590
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    VDD, Positive power supply
    VSS, negative power supply
    SP+, Speaker output (probably with respect to ground, otherwise with respect to VSS)
    GND, Common electrical connection for all signals in and out
    IN Audio inpu
     
  14. Stéphen Grosjean

    Thread Starter New Member

    Nov 21, 2018
    8
    0
    Thank's a lot, I made it work, sound was really bad and even after cleaning the signal it was not good, I tried something and blew the chip ^^
    Thank everyone for your help!
     
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