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Old 3rd April 2011, 06:37 AM   #1
Havoxx is offline Havoxx  United States
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Default Trying to make a small sub out of a chipamp?

Hey all, I was scouring the internet for information, but is it possible to make a chipamp power a small PC sub? Nothing too extensive, and doesn't have to be too powerful, just enough to give a well, nice bass to PC music, I don't have too much money, and I have worked with an LM386 before, and I do find it quite fun, I was curious if anyone knows how I would go about making a PC sub out of a IC chip, and which one would work best. Thank you !

-Oscar
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Old 3rd April 2011, 06:41 AM   #2
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That will certainly work. Most store-bought PC subs (at least the ones i've pulled apart) are chip amps.

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Old 3rd April 2011, 07:15 AM   #3
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Oscar, since you're on a budget I suggest searching the web for a good deal on a driver. Once you've got a driver, then you can focus in on the proper enclosure and chipamp, and merging it with your current setup.
There's loads of information & support for the LM1875 chip. With just a modest power supply it will put out ten to twenty watts. I only mention it as a starting point. I don't really know what your design goals are other than your generalized statements.
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Old 3rd April 2011, 04:21 PM   #4
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Quote:
Originally Posted by sofaspud View Post
Oscar, since you're on a budget I suggest searching the web for a good deal on a driver. Once you've got a driver, then you can focus in on the proper enclosure and chipamp, and merging it with your current setup.
There's loads of information & support for the LM1875 chip. With just a modest power supply it will put out ten to twenty watts. I only mention it as a starting point. I don't really know what your design goals are other than your generalized statements.
I actually have an old samsung subwoofer out of a home stereo system that is rated at 100w, and it sounded great when I used it, but the amp itself was a display model and went nuts after a few weeks. I don't know the exact specs of it, I just know it's 100w and it's a 6" driver. I did check out the LM1875, and it looks like it would work quite well, not to mention it looks pretty simple to wire.

Now as far as a power supply, can I use a wall-wart and modify it, or should I make my own transformer for it?
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Old 3rd April 2011, 05:23 PM   #5
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You have the driver/enclosure, you're just looking to replace the old amp?

No, a wall-wart probably won't do. Maybe, just maybe, a surplus switchmode supply will work. Otherwise you'll need a transformer.
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Old 3rd April 2011, 07:37 PM   #6
Havoxx is offline Havoxx  United States
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Yea pretty much, I'm looking to make an amp for my PC, since I have all the other speakers working just fine, I'm just missing one for the subwoofer channel. It's just a driver, and the enclosure as you said, there is no amp/power to it, it's one of those that was powered by the headunit
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Old 3rd April 2011, 08:30 PM   #7
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So you have a subwoofer-out signal. All you need is an amplifier and power supply. Yeah, the LM1875 would do. It's a little bit "up-the-ladder" from a LM386 but nothing you can't handle. I'd check the subwoofer forum for info on using a switchmode supply; I have no firsthand experience with it but see it as a suitable possibility. There may be something I'm overlooking though. Something like 20 volts at 5 amps is where I'd be looking for a power supply.
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Old 3rd April 2011, 09:02 PM   #8
Havoxx is offline Havoxx  United States
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Alright, I will check out what I need and make myself a little parts list, I do appreciate the help, it's nice to have someone that at least knows a bit more than me lol.
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Old 31st July 2011, 04:26 AM   #9
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You can try TDA8947J
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Old 1st August 2011, 08:42 AM   #10
sasmit is offline sasmit  India
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Quote:
Originally Posted by sofaspud View Post
Oscar, since you're on a budget I suggest searching the web for a good deal on a driver. Once you've got a driver, then you can focus in on the proper enclosure and chipamp, and merging it with your current setup.
There's loads of information & support for the LM1875 chip. With just a modest power supply it will put out ten to twenty watts. I only mention it as a starting point. I don't really know what your design goals are other than your generalized statements.
Finding a good driver for a small sub is really tough. I would suggest the same thing, find a driver and decide on the type of enclosure first before you decide on a chip.
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