Hydrophone Build: Seeking Help on Voltage Issues with Op-Amp

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Discussion Overview

The discussion revolves around the construction of a hydrophone using a piezo crystal as a sound receiver, with a focus on the voltage issues related to op-amps. Participants are exploring the suitability of different op-amps for amplifying low-level signals from the hydrophone to a level that can be heard through headphones.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests using a TL082 op-amp instead of the LM741, citing its higher input impedance due to its JFET design, which may be more suitable for microphone applications.
  • Another participant echoes the recommendation for the TL082, emphasizing its advantages over the LM741.
  • Some participants request more information about the LM741 and MA741, indicating a need for clarification on these components.
  • There is a light-hearted exchange regarding the use of search engines for information, with one participant humorously referencing a "closed loop search."

Areas of Agreement / Disagreement

There is no clear consensus on the best op-amp to use, as participants have differing opinions on the suitability of the LM741 versus the TL082. The discussion remains unresolved regarding the optimal choice for the hydrophone project.

Contextual Notes

Participants have not fully explored the limitations of the LM741 or the specific requirements for the hydrophone's application, leaving some assumptions unaddressed.

Adder_Noir
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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:
 
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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.
 
what said:
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.

Thanks what :redface:
 
please shows me about LM741 or MA741.Thank You very much!
 
hahaha...is this an example of a closed loop search?
 
Recursion: See Recursion. :biggrin:
 

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