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Old 3rd October 2012, 01:13 PM   #1
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Default Suggestions for a low power, 2.1 channel kit/schem?

I want to build a battery powered amp so I can have it outside, etc... I plan to have it powered by an SLA so 12v if possible.

I've already built a pair of overnight sensations for the primary speakers, and realized that, while they sound great, they deffinately need a sub. So in the "head unit" I'd like to include a small (6"?) sub. In fact, that will likely take up the most space.

So the amp would need to put out around 50watts @ 8oms per channel and then maybe 100 watts for the sub? Open to suggestions there, haven't picked out the driver yet.

I don't have the skills to design my own, but I can follow a schematic or better yet, put together a kit. I've got a lab power supply, signal generator, Oscilloscope, etc... and have built tube amps in the past. Also, I have an extra arduino sitting here... dunno if I can use that for anything.

So, key features:
3 or 4 channels
12-24volts
very efficient
Volume control
Some sort of passive Hi/low pass filter to split the bass off to the sub. Preferably adjustable, if even by just a switch.
Available kit or PCB
has to sound "great" of course
relatively low cost
I do not need multiple inputs, but it wont bother me if they are there.

I did get an "Indeed TA 2020s" a while back but it just didn't have enough umph. Then my father bumped the wrong button on my power supply, dumped 25volts into it and fried it because, while it seems designed relatively well, they never though to fuse it... go figure.

Any suggestions on a kit or PCB I Should get would be greatly appreciated!
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Old 3rd October 2012, 02:09 PM   #2
jaycee is offline jaycee  United Kingdom
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Location: Norwich, UK
Rather than try and get an amp that will run on 12/24v, it would be better to build an SMPS that will take 24V in and put out the required symmetric supply rails. You can find such circuits meant for car use and adapt accordingly. 24V would be better as there would be a LOT of current at 12V.
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Old 3rd October 2012, 05:04 PM   #3
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ok, any suggestions on schematics/kits like what you are suggesting?
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Old 3rd October 2012, 08:40 PM   #4
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50W and 100W at 8ohm with a 12V supply will be very hard to do.
it is possible. but you are better of using a DC-DC converter as jaycee said.
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Old 3rd October 2012, 08:46 PM   #5
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charlie. you can use somthing like this one. to get dual rail voltage up to +/-45V. that will give you some headroom. for a 50W at 8ohm amp. you need around +/-30V rails.
and use 2 of the same amps in bridge mode for the sub. at same rail voltage.

http://item.taobao.com/item.htm?id=12502102705 - Boards | Kits | Components | Modules | Tools

Last edited by AudioSan; 3rd October 2012 at 08:50 PM.
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Old 3rd October 2012, 09:42 PM   #6
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A bit expensive, but hopefully I can find a more affordable solution... So assuming the 12-24v requirement is gone, any suggestions for an amp?
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Old 3rd October 2012, 10:37 PM   #7
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depending on what you want to drive with it. LM3886 based chipamp is good easy and cheap. but if you want a little more soldering work and such. maybe some MX50 modules can be something for you.
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Old 3rd October 2012, 10:57 PM   #8
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LM3886 is good easy and cheap? I'm sold. I'll search around for some kits or schematics. If you have any recommendations I'd be happy to hear them.
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Old 3rd October 2012, 11:51 PM   #9
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So would this work?
xy DIY LM3886 68W Amplifier kit -17 | eBay
I'd need 2 for my mains, and 2 for a possibly dual coil sub. Then a DC-DC converter right?

Any suggestions for a preamp stage that had volume control and could split the channels into 4 via high-pass/low-pass filters to power the sub?
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Old 3rd October 2012, 11:56 PM   #10
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try chipamp.com they have some good LM3886 kits. and plain PCB's if you want to get parts your self.
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