How to correctly amplify a low power audio signal signal

Other Hardware Audio
1

Hi!

Im currently working on a project and am looking for a way to amplify a signal that I have for a small 1 (max 2) watt, 8 ohm speaker. The signal i currently have is 5V and (max) 0.15mA (max amplitude). I thus need to amplify my signal big time but I do not have much knowledge on the topic of audio amplification. Was looking into chips like the TEA2025B or PAM8406 but I there is so much info on those datasheets and I am having a hard time wrapping my head around all of it.

Can any of you help me out, or can explain what I need? I don't mind whether they are mono, stereo or multichannel amplifiers, nor do i care about the size of the chips. Would just love to have some solution.

Thanks in advance!

2

There are several small audio amplifier modules like this one that are easy to wire up and will work well.

1 Like
3

Maybe that can help you Audio Amplifier on LM386

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4

Thanks a lot for the advice. Ordered one and gonna check how it works today! Will come back with some more info after that :slight_smile:

5

5V rms? peak-to-peak? or peak?

You may need to attenuate the signal first, as 5Vrms is already 3W if naively
amplified to high current into 8-ohm load. So a volume pot on the input
may be needed - however to select this you need an idea of the source
impedance.

Most audio amps assume the input is line-level, ie 0.1 to 0.5Vrms sort of range,
and have voltage gain. Most audio amp chips have a minimum voltage gain
that's substantially greater than unity.

Can you explain what this signal actually is?

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