A quick question reguarding audio Amplifiers

[Splitshot109]

Hello all! I am very new to this forum, but I have been looking into re using a bunch of old speakers I have salvaged from old electronics, and was wondering if I could have some help on where to go to get an audio amplifier for them. I am interested in making portable speaker systems just for the fun of re using these and to give to friends asking for them

I currently have:

2 x 5ohms 6W Speakers

2 x 8ohms 10W speakers

1 x 8ohms 0.5W speaker

1 x 8ohms 3W speaker

I would like to have an amplifier for each type of speaker I listed so that I can get the most out of these speakers

thanks for any help!

 

[Chris Daly]

Hi
Your need of being portable and relatively low power output, could be
met with a LM1875 kit(s) being connected as a single ended amp(s).
http://www.ti.com/lit/ds/symlink/lm1875.pdf

just remember to use a heat sink !

There are boards available and kits at the usual retail outlets.
have fun !

Cheers / Chris

 

[abraxalito]

For portable sound solutions, classD is the way to go as you'll get better battery life. Here's an amp that needs an external power supply - you could use batteries or a wall-wart if indoors.

HIFI Class 2.0 Stereo Digital Amplifier TPA3116 Advanced 50W + 50W-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

 

[AndrewT]

design for 5ohms loading and the one amplifier design will successfully drive any of those 5 or 8ohms speakers.

But two speakers in parallel is equivalent to halving their impedance.

Two 8ohms in parallel becomes a 4ohms load. You would need to design for this lower load.