Help Please

Discussion in 'General Electronics Chat' started by MDK, Mar 18, 2008.

  1. MDK

    Thread Starter Member

    Feb 1, 2008
    22
    0
    I need an op amp design FAST!!! i need one with a big enough gain for a guitar.


    Thanks:D
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Just about any opamp has a voltage gain of about 200,000 or more which is much too much for a guitar. Negative feedback with two resistors reduces the gain to whatever you need.

    Since you don't need voltage gain then what other kind of gain do you need?

    Does your guitar have a magnetic pickup? Why do you need to add an opamp?
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If by " big enough gain for a guitar" you mean to drive speakers, you might look at Apex Technology. They make op amps with outputs rated up to 10 amps at 300 volts.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    This page has lots of ideas for guitar effects and "stomp boxes"
    http://www.geofex.com/

    But really, were you looking to build a practice amp, a headphone amp, or what?

    If you want a really good sounding guitar amp, you'll need to look at tube models.
     
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