Need Help with Small Amp

[BubbaGump]

I am really new at this, and having never built an audio amp, I really need help. I am trying to create a stereo audio amplifier with an output power of close to 4W per channel. The speakers I am using are the CMSO321KLX
If anyone can just flat out tell me what IC to use and give me the design (or where I can buy a kit), I could finally figure out how to build an amp. I really just need a good amp to build with my hands and I will learn a lot more than just reading about stuff. Thanks.

[jaybombalous]

Don't some pre-amp's have 20 watts a channel?

[owen]

The Sonic Impact T amp fits this remit like a glove...


Owen

[Boris_The_Blade]

An LM1875T or LM675T would be a good beginner's part. There are various kits around...do a search and I'm sure you'll find something. They are rated for higher power, but just a wimpier supply would be OK for your power levels.

[BubbaGump]

Yeah those would probably be ok, but it looks like its only one channel (mono). I need it to supply power to 2 speakers, (stereo.) can anyone give me any other options?

[Nordic]

If people can fit two LM3875 circuits plus sinks in a PC power supply box, so can you....

[Boris_The_Blade]

This would do ya fine...

http://www.electronics123.com/s.nl/i...=8&category=33

Just remember to pick up a 12VDC wallwart supply that gives 12vdc at least an amp. Preferable 1.5 amps. A switching supply would be good here since they are lightweight. You'll have to cut the connector off the end to hook it up to the kit. Remember or write down the polarity.

[v-bro]

My choice would be AMP3 or AMP32 http://www.41hz.com

[Nordic]

A kit is great as a second build, but figuring out and pieceing together that first litlle screamer, is a job you should do yourself.

Building a circuit will give your more familiarity with the many concepts out there, in a physical tangible way... I have built complete kits without even looking ath the scematic... just plugging parts into the silkscreen....saved a few bucks from buying the complete item, but learned nothing!

You just have to follow the simple pre thread, to see how even the smallest bits of information on customs and conventions found in the real world, like which way around to hold an IC to number the pins, can be daunting, but will be lifelong skills once learned, but crippleing until.

I suggest you goole Datasheet LM1875 to get a datasheet on the chip, and a suggested schematic... make a list of parts, buy them, lay them out to accommodate their physical sizes (later you will learn to order the size you want).

Then come back and we will show you how to filter out the frequencies below what those speakers can handle... saves your amp/batteries alot of work keeps the speakers happy, and improves sonics by haveing to cover a smaller bandwith.

I think the average Lego kit for 10 year olds, is more complicated to build, it just exludes the opportunities for burning your fingers on a hot iron...WHICH YOU WILL DO! ....at least a few times

[v-bro]

Originally posted by Nordic
A kit is great as a second build, but figuring out and pieceing together that first litlle screamer, is a job you should do yourself.

I think it depends on whether you want to learn or just want an amp...

I actually learned a lot from building kits, it just depends on how inquisitive you are....