Speaker/Microphone and Inverting Op Amp


by Jiggy-Ninja
Tags: inverting
Jiggy-Ninja
Jiggy-Ninja is offline
#1
Nov12-11, 03:08 PM
P: 310
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?
Phys.Org News Partner Engineering news on Phys.org
PsiKick's batteryless sensors poised for coming 'Internet of things'
Researcher launches successful tech start-up to help the blind
Researchers propose network-based evaluation tool to assess relief operations feasibility

Register to reply

Related Discussions
Microphone Help. Electrical Engineering 1
NC open with condensor microphone Electrical Engineering 3
Non Inverting and Inverting Amplifiers Introductory Physics Homework 1
Microphone in vaccuum General Physics 10
output power of a microphone? Electrical Engineering 3