decibel adjustment for an op amp

Discussion in 'The Projects Forum' started by abdus, May 11, 2010.

  1. abdus

    Thread Starter New Member

    Mar 4, 2010
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    hello,
    i just have to build a bass, terrible and mid controller (passive ) circuit..
    now i have to set a decible adjustment of the output with (+,-18dB)
    what calculations should i have to make to get the adjustable (+-18dB) output..???
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    Is this a color organ or a tone control?
     
  3. abdus

    Thread Starter New Member

    Mar 4, 2010
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    0
    I JST HAVE MADE THE DESING OF TONE CONTROL USING OP-AMP,NW THE PROBLEM IS:
    CAN I USE LM 324 (QUAD)AS A NORMAL OP-AMP APPLICATION?
    I AN IN CONFUSSION BECAUSE IT DOSNT HAVE ANY -vcc OPTION,JST A +vcc AND A GROUND OPTION..
    SO CAN I USE IT FOR A TYPICAL APPLICATION WHERE 4 OP-AMPS ARE USED??
     
  4. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
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    Yes, you can use a quad. You only have to use one of the opamps on the chip.

    If you look on the LM324 datasheet, it will show you which pins hook to each opamp in the package.

    be sure to connect all unused pins to ground.
     
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  5. kingdano

    Member

    Apr 14, 2010
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    19
    retched,

    i could have sworn you answered this question twice...
    :rolleyes:
     
  6. retched

    AAC Fanatic!

    Dec 5, 2009
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    Im multi-talented..or forgetful.. ;)
     
  7. abdus

    Thread Starter New Member

    Mar 4, 2010
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    0

    but how can i connect the -vcc to the op-amps????as i have studied that op-amps have both the +ve and -ve supplies...but this is have jst +ve input and ground:s
     
  8. retched

    AAC Fanatic!

    Dec 5, 2009
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    abdus likes this.
  9. abdus

    Thread Starter New Member

    Mar 4, 2010
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    its basically a tone controll.
     
  10. bertus

    Administrator

    Apr 5, 2008
    15,648
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    Hello,

    Do you have a schematic of the tone control?
    Can you post it, so we can have a look at it.
    Or are you looking for one?

    Bertus
     
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