Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Neither. 0.5W is the maximum power coming from an amplifier that the speaker can stand without damage and/or excessive distortion. It will produce sound even if the incoming voltage is only 0.1V (0.00125W) or even less.2) I have a speaker with 8 ohms, 0.5 W and using P=(V^2)/R, I found that the voltage is 2V's. Is it the output voltage from the speaker or the voltage needed for the speaker to function?
General-purpose opamps like the LM1458 are meant to be used mainly as voltage amplifiers. This means that they are normally expected to have a high impedance load, which in turn means that they are not expected to deliver high currents to the load. A speaker is a low impedance device. Therefore an opamp (except a special high-power opamp) is not suitable for driving a speaker directly. We need a power amplifier, even a simple one, for that.Yes, I want to implement this to detect baby cries. But I am yet to understand how to get an output from electret microphone that is heard over a simple speaker. I'm a novice, and I am trying to learn bit by bit.
(To simplify matters, let's stick to voltage amplifiers for the time being and ignore current and power requirements at the output)So, how exactly will I know how much to amplify the voltage from the electret microphone? Can you provide me with a simple, low power and high gain circuit to achieve 5V.