Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 3rd October 2012, 01:13 PM   #1
diyAudio Member
Join Date: Sep 2012
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
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!
  Reply With Quote
Old 3rd October 2012, 02:09 PM   #2
jaycee is offline jaycee  United Kingdom
diyAudio Member
Join Date: Apr 2004
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.
  Reply With Quote
Old 3rd October 2012, 05:04 PM   #3
diyAudio Member
Join Date: Sep 2012
ok, any suggestions on schematics/kits like what you are suggesting?
  Reply With Quote
Old 3rd October 2012, 08:40 PM   #4
diyAudio Member
Join Date: Feb 2009
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.
  Reply With Quote
Old 3rd October 2012, 08:46 PM   #5
diyAudio Member
Join Date: Feb 2009
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.
  Reply With Quote
Old 3rd October 2012, 09:42 PM   #6
diyAudio Member
Join Date: Sep 2012
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?
  Reply With Quote
Old 3rd October 2012, 10:37 PM   #7
diyAudio Member
Join Date: Feb 2009
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.
  Reply With Quote
Old 3rd October 2012, 10:57 PM   #8
diyAudio Member
Join Date: Sep 2012
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.
  Reply With Quote
Old 3rd October 2012, 11:51 PM   #9
diyAudio Member
Join Date: Sep 2012
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?
  Reply With Quote
Old 3rd October 2012, 11:56 PM   #10
diyAudio Member
Join Date: Feb 2009
try chipamp.com they have some good LM3886 kits. and plain PCB's if you want to get parts your self.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY Low Power Class A (or AB) amplifier suggestions gareth Solid State 2 16th June 2009 02:46 PM
Ideas, suggestions, and schem to improve Sony sdpep9 es? mpmarino Digital Source 9 19th September 2008 05:21 PM
Just picked up a Marantz CD-94 mkII: schem/ser manual + modding suggestions? adhoc Digital Source 7 25th July 2006 04:08 PM
Suggestions for a high-power low noise Zener regulator ? youyoung21147 Power Supplies 0 29th November 2005 11:48 AM
pure n channel schem. help needed psychosteve Solid State 0 18th December 2004 12:26 PM

New To Site? Need Help?

All times are GMT. The time now is 06:15 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2