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Op-Amp Gain

  1. May 26, 2007 #1
    Hi,

    I'm currently making a hydrophone and I'm planning to use a piezo crystal as a sound receiver whose output I then intend to put through an op-amp. Berkeman recently raised an interesting point about voltage issues with op-amps so I thought I'd pose this question before proceeding any further.

    I expect the signal to be of the order of millivolts and I want to turn it into something audible with headphones. Would a LM741 op-amp be okay for this or are it's limitations to severe? I'm guess I'd need a gain of about 1000 for it to work?

    Can anyone help? Sorry to post yet another topic but why not take advantage of other people's expertise :wink:
     
  2. jcsd
  3. May 26, 2007 #2
    I'd recommend you use a TL082 for a microphone, probably is also avialable in radio shack. The chip is based of jfets which provide a very high input impedance, much higher than LM741. Also you get two opamp in this chip.
     
  4. May 27, 2007 #3
    Thanks waht :redface:
     
  5. Apr 21, 2008 #4
    please shows me about LM741 or MA741.Thank You very much!
     
  6. Apr 22, 2008 #5
  7. Apr 23, 2008 #6
  8. Apr 25, 2008 #7
    hahaha...is this an example of a closed loop search?
     
  9. Apr 28, 2008 #8
    Recursion: See Recursion. :biggrin:
     
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