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Old 26th September 2011, 11:02 PM   #1
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Default Line level to low power speaker amplifier

Hi guys,

I'm looking for a discrete amplifier (with or without speakers) that will drive low power speakers (0.5-2W or so) from line level motherboard (pc headphones) output. I cannot use off the shelf customer-ready products like desktop speakers for example.

I need something that does not require alot of assembly/outside circuitry and that is mass produced (preferrably). I found it kinda hard to find it on the internet. If anyone has any info on where I could potentially find one, please help me out.

Thank you very much.
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Old 27th September 2011, 09:49 PM   #2
! is offline !  United States
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I suspect you would get more replies if we knew where you are located and more details about the project, for example why it can't be off the shelf customer-ready, yet wouldn't require assembly or outside circuitry which is essentially what off the shelf customer ready IS.

Do you basically mean you want the equivalent of the PCB, jacks, pot, and knobs from desktop computer speakers but not the speaker housing? What if you only had to remove the PCB from the speaker housing? Sadly the way goods are produced and sold in volume, sometimes it is less expensive to buy something that costs more to build, simply because the factory was set up to make a product appealing to the masses instead of niche hobbyists or special applications (like finished ready to use computer speakers).

Otherwise, in the USA I would just start by going to ebay, searching for "stereo amp" and sort by price and pick "buy it now" which would show the cheapest items not for auction which would tend to be very low wattage chipamp boards with solder pads or terminals for I/O, to which you supply your own volume pot, power switch, input and output sockets/jacks/etc, power supply, enclosure, etc.

How are you defining "discrete" in this context?
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Old 27th September 2011, 09:59 PM   #3
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Thank you for your reply!

Yes, roughly speaking I need an equivalent of PCB, jacks, pot, and knobs from desktop computer speakers but not the speaker housing. Actually not even that, I just need to find a suitable PCB/chip (large enough to be assembled/soldered by hands) that needs minimum outside components (like resistors, caps, etc). I can find suitable jacks, speakers and knobs all that. Something close to this: http://www.ebay.ca/itm/2-W-Small-Mon...#ht_2538wt_905

Except I need it to be mass produced, since I'm working on a project for a small company and after finding a suitable solution, we'll need mass quantities. We're using a small motherboard with an audio output-so I need an amp to drive small (laptop type) speakers.
I'm considering an LM386 (or 368, can't remember) amp, but it still requires addition of a few resistors and capacitors.

Last edited by Granovsky; 27th September 2011 at 10:07 PM.
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Old 29th September 2011, 11:13 AM   #4
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Correct me if i am wrong . As it sounds to me like you want to build a 1 chip amplifier with no capacitors or resistors?. How many of these little amplifiers do you need

Regards Ian
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Old 29th September 2011, 11:50 AM   #5
sreten is offline sreten  United Kingdom
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Hi,

The supply might be your biggest problem and you probably need a stereo chip,
e.g. TDA2822M or similar.

rgds, sreten.
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Old 29th September 2011, 05:09 PM   #6
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The TDA2822M would be a good choice. A pair of LM386 chips would be good too.
You'll need to design the circuitboard (or have someone design it for you).

Please send me an email and I can help with the design, layout and finding a company to produce the PCBs for you.
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Old 29th September 2011, 05:11 PM   #7
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Quote:
Originally Posted by madtecchy View Post
Correct me if i am wrong . As it sounds to me like you want to build a 1 chip amplifier with no capacitors or resistors?. How many of these little amplifiers do you need

Regards Ian
That's the thing, I'm looking for a ready-to-use amplifier that does not require any external components to be added (ideally). And that I would be able to get it in mass quantities later.
After days of searching, I might have found what I need: Kemo Electronic 3.5W Single Channel Audio Amplifier Module | M031N | Kemo Electronic I just have to see whether I can get these in large quantities.
If anyone knows of other companies/distributors that have this sort of product, please let me know.
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Old 29th September 2011, 05:44 PM   #8
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Quote:
Originally Posted by Frank Berry View Post
The TDA2822M would be a good choice. A pair of LM386 chips would be good too.
You'll need to design the circuitboard (or have someone design it for you).

Please send me an email and I can help with the design, layout and finding a company to produce the PCBs for you.
Thank you Frank, but I'll see where I get with those ready-to-use modules. I'm an electronics engineering student and I would love to customize an amp, but the company wants to just get a ready product.
Thanks again!

P.S. What do you think about the low power audio amp design LM386 has in it's datasheet? It only uses 1 chip; did you have 2 chips in mind because we need 2 channels for stereo?
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Old 29th September 2011, 05:46 PM   #9
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Quote:
Originally Posted by sreten View Post
Hi,

The supply might be your biggest problem and you probably need a stereo chip,
e.g. TDA2822M or similar.

rgds, sreten.
Thanks! Interesting chip, will keep in mind.
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Old 30th September 2011, 12:32 AM   #10
! is offline !  United States
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Depending on the quantities needed, you might investigate 'sites like Alibaba.com,
Amplifier Module-Amplifier Module Manufacturers, Suppliers and Exporters on Alibaba.com

Make it clear you are interested in volume but that you need a sample to test.

Last edited by !; 30th September 2011 at 12:35 AM.
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