Speaker/Microphone and Inverting Op Amp

  • #1
309
1

Main Question or Discussion Point

1) What is a typical voltage level coming from an 8Ω speaker being used as a microphone to record a human voice at average volume? I kept forgetting to bring it to school to measure it's output with the oscilloscope, so I'm wondering if anyone here knows it.

2) I seem to remember reading somewhere that using an inverting op amp configuration with a gain of less than 1 was unstable, or otherwise bad for some reason. I can't remember where I read it or why it said it was bad or anything else. This op amp would be used to attenuate an audio tone to a level manageable by the circuitry that formerly had the speaker hooked up to it (a Walkie-Talkie). Would there be any problems with this setup, or is my spotty memory unfounded?
 

Answers and Replies

  • #2
8,244
5,057
An inverting op amp is not unstable with a gain < 1
 

Related Threads on Speaker/Microphone and Inverting Op Amp

  • Last Post
Replies
2
Views
4K
  • Last Post
Replies
12
Views
9K
Replies
4
Views
1K
Replies
6
Views
784
  • Last Post
Replies
7
Views
1K
Replies
2
Views
10K
Replies
6
Views
10K
Replies
6
Views
1K
Replies
9
Views
3K
Replies
33
Views
2K
Top