tips on building micro speaker amp?

[Illum]

I have a pair of computer speakers that are just plug and play, no AC adapter required.

Radioshack Optimus water resistant speaker set.
Input: 4 ohms
Max power: 2W

Having very little knowledge of how audio amplifiers work is it possible to create a stereo amplifier that runs on batteries [as low as 3V? I'm thinking of using it to drain half spent cr123as as well] where I can plug my MP3 in on one end and the speakers in the other?

With the current setup I can play classic piano comfortably loud through these speakers when I set my MP3 player's volume at 15/25, but it drains the battery pretty quickly [~4 hours before the meter hits half, basically my limit when it comes to discharging li-ions], I was hoping to create something that will allow me to keep the volume around 5-10/25 while enjoying the same intensity as 15/25 volume. As you can see...I'm not looking for a 10W amplification, just something you would use for your earphones.

Something like this, but not $135


circuit geek's schematic has a layout I was looking for...with the exception of that "10-20V input"


When they say "single channel" does that imply "mono?"

:thanks:

 

[cyberspyder]

I have a pair of computer speakers that are just plug and play, no AC adapter required.

Radioshack Optimus water resistant speaker set.
Input: 4 ohms
Max power: 2W

Having very little knowledge of how audio amplifiers work is it possible to create a stereo amplifier that runs on batteries [as low as 3V? I'm thinking of using it to drain half spent cr123as as well] where I can plug my MP3 in on one end and the speakers in the other?

With the current setup I can play classic piano comfortably loud through these speakers when I set my MP3 player's volume at 15/25, but it drains the battery pretty quickly [~4 hours before the meter hits half, basically my limit when it comes to discharging li-ions], I was hoping to create something that will allow me to keep the volume around 5-10/25 while enjoying the same intensity as 15/25 volume. As you can see...I'm not looking for a 10W amplification, just something you would use for your earphones.

Something like this, but not $135


circuit geek's schematic has a layout I was looking for...with the exception of that "10-20V input"


When they say "single channel" does that imply "mono?"

:thanks:

That means you need to build two of them for stereo. My recommendation is a Chipamp.

 

[Illum]

chip amp?

 

[alpg88]

might be cheaper and easier to find comp. speakers with built in amp, rip it out, and put in in enclosure, cuz it is possible to build one yourself, internet full of diagramms, even kits, but i,m not sure how clean of a sound you'll get.

 

[louie]

You could go crazy trying to build your own and get it right, although many of us like to do that.

Consider something like a Boostaroo. I haven't used one, but have heard they work OK. $30-40, 3 volts.

http://www.boostaroo.com/index.html

 

[tiktok 22]

How about a Boostaroo?

 

[R@ndom]

A cmoy?

 

[here4fun]

For a portable setup, you may want to consider a Class D amplifier for efficient power usage. The trade-off is they typically require a very efficient speaker (90db+) in order to produce the sound level you may be looking for. I've built a 20W X 2 channel amplifier based on the Tripath TA2020 chip - see http://www.41hz.com/shop/ for kits.

You may want to take a look take a look over at http://www.diyaudio.com though the site may lead to yet another technical addiction....

I hope this helps.

 

[Illum]

ooh...looks fun