Posts: 53
Joined: Thu Nov 05, 2015 3:48 am

Any Good Stereo Amplifiers

Tue Oct 04, 2016 1:57 am

I am looking for a good stereo amplifier for a project I am working on. I need it to be able to run at 5v and I'm looking for about 10-20W output to the speakers.

User avatar
Posts: 6182
Joined: Thu Sep 29, 2011 4:34 pm
Location: Berkshire UK Tralfamadore
Contact: Website

Re: Any Good Stereo Amplifiers

Tue Oct 04, 2016 10:01 am

I've had a look through your previous posts, and got the impression you may be going to be disappointed.

You seem to want an amplifier that runs on 5v and outputs 20W.
Straightforward Ohm's law says that (1) that requires 4A from the supply, and (2) the speakers will have to be about 1Ω
(1) isn't impossible, but most speakers I've seen are 4Ω so (2) will be difficult

And that's not taking into account the fact that sound isn't DC.
For a sine wave, the peak voltage and current is almost half as much again compared to the RMS value, and the peak power is twice the average.
So your supply will have to be able to supply ±6A

So look for a supply of, eg, 24v and an amp capable of handling that.

User avatar
Posts: 10531
Joined: Tue Nov 29, 2011 11:12 am
Location: North West UK
Contact: Twitter YouTube

Re: Any Good Stereo Amplifiers

Tue Oct 04, 2016 10:41 am

also look at using the HDMI as the audio source and not the other analog stuff
How To ask Questions :- http://www.catb.org/esr/faqs/smart-questions.html
WARNING - some parts of this post may be erroneous YMMV


Return to “Graphics, sound and multimedia”