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Old 31st December 2012, 02:24 PM   #1
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Default How to increase the total output power or bass of small chip amp?

How do I increase the total output power of this chip amp? LA4225 datasheet(3/3 Pages) SANYO | Monolithic Linear IC Audio Output for TV application 5W Monaural Power Amplifier
I want to get a little more power without using more voltage..
Sort of the way 12 volt car amplifiers do... but without so much components..
I'm using 12 volt 1 amp power supply to power it..
If I increase the amps of the power supply will I get more output power to the speakers?
Because I have a computer power supply that puts out 250 watts at 12 volts
If I hooked that up how much of an increase would I see?
Is there any danger of using so much amps in this tiny chip?
At high volume it doesnt even get slightly warm in fact its stone cold.. running from 1 amp 12 volts (possibly 14 volts because I don't know how much power really comes out of the little DC power supply..)
I'm not looking for loudness... I'm looking for more bass.... or better low frequencies..
Is there anything I can add to improve the circuit? or using a power supply with more amps?
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Old 31st December 2012, 02:42 PM   #2
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Gain is set internally at about x200, so you can't change that.

Yes, The chip can deliver 3.3Amps, so you should up the power supply's current. This may help with big transients, which are often bass. Though the 1000uF cap across the power may already be supplying some of this. You could also change this to 2200u. It may help a tiny bit.

For more power you could try using 4 ohm speakers if you aren't already. Or wire two 8 ohms in parallel.

The data sheet says nothing about frequency response. The input cap is fine, but to get more bass the output cap should probably be upped to 1000u or 2200u, especially into 4 ohms. Maybe even 4700u.

Obviously you can't get much out of a 5W tv amp, but this might help.

Question: what are you inputting?

Last edited by Robert Kesh; 31st December 2012 at 02:49 PM.
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Old 31st December 2012, 02:48 PM   #3
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I have 2000uFs for the output capacitor..
and 4.7uF input cap
And im using a 12 inch 4 ohm subwoofer (which sounds awesome already)
But if it can deliver that much more power... That would be awesome..
I'm just using my comps headphone jack hooked to the input... at low volume... and there is almost no static so i'm good on sound quality..... as far as that goes......
I have gotten the speaker to move quite a bit... but I will definitally try using the computer power supply next time I get around to doing it..
I also have two 8 ohm speakers which work wonderfully.... along in parallel with the 4 ohm subwoofer... 2 ohms is quite a load for this little chip but it doesnt even break a sweat with the massive heatsink i've got for it.. and it truly is overkill for this little chip... but bigger heatsink is always better right? maybe i could try the PC power supply next time
I have the amp and chip all neatly stored in a box with speaker hookup terminals so its very easy to change speakers..
sorry if it sounds a little weird coming from me... Im autistic and I have ADHD... but im doing the best i can to describe what i've got setup..

Last edited by realflow100; 31st December 2012 at 02:51 PM.
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Old 31st December 2012, 02:57 PM   #4
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The 3.3Amp is an absolute max, peak transient, so it will probably be severely distorted and over driven approaching that.

It's probably time to get a bigger chip.
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Old 31st December 2012, 02:58 PM   #5
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I don't have any other chips this is the only one i got for right now... and if I unhook it i'm afraid one of the leads going to the chip will break because they're so fragile..
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Old 31st December 2012, 04:23 PM   #6
sreten is offline sreten  United Kingdom
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Hi,

A 12V supply is about right for a 4ohm load, and TBH a 1A supply is also
about right, with a maximum chip dissipation of 7.5W. Though using the
big 12V supply should be OK, you may release the audio magic smoke
in the device with 2 ohm loads, unless its built in protection is good.
If it is good, its unlikely to produce any more power into 2 ohms than 4.

FWIW a properly designed vented box for the driver may be able to
increase the low bass output and efficiency by a significant amount.

Driver Fs, Qts and Vas are needed for the calculations, what box do have ?

rgds, sreten.

Around 5W is standard for a 12V amplifier and 4 ohm load.
Chips that bridge two standard amplifiers get up to 20W.
Why nearly all cheap car head units are 20W per channel.

Click the image to open in full size.

http://www.hqew.net/circuit-diagram/...gram_3888.html
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Last edited by sreten; 31st December 2012 at 04:32 PM.
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Old 31st December 2012, 04:56 PM   #7
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The box is ruined... and the subwoofer has duct tape all over it..
I'm planning on buying a standard ported box and a standard JBL 12 inch subwoofer the next time I go to town..
Maybe I'll find something even better if I'm lucky enough..
I have just around 100 dollars to spend.. so I should be able to find something that's way better than what I have..
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Old 31st December 2012, 06:46 PM   #8
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by realflow100 View Post
The box is ruined... and the subwoofer has duct tape all over it..
I'm planning on buying a standard ported box and a standard JBL 12 inch subwoofer the next time I go to town..
Maybe I'll find something even better if I'm lucky enough..
I have just around 100 dollars to spend.. so I should be able to find something that's way better than what I have..
Hi,

A box is a box, maybe useful, may be not.

A sub is a sub, duct tape shouldn't come into it.

Standard car sub ported boxes are nowhere near what
what you might use at home with the same driver.

rgds, sreten.
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Old 31st December 2012, 06:54 PM   #9
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i have a walmart 30 dollar DUAL subwoofer but its got duct tape instead of a normal foam surround..
the box is a modified fisher stv 655B
with a far too big port on it..
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