Searching for 2.1 amp board for SINGLE 12v - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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
Reply
 
Thread Tools Search this Thread
Old 21st December 2014, 02:51 PM   #1
diyAudio Member
 
Join Date: Dec 2014
Default Searching for 2.1 amp board for SINGLE 12v

Starting a speaker box project with my 12 year old son.
Looking for a 2.1 amp board in the 18w - 18w +25w range that is efficient on 11-13v.
I am finding a ton of TDA 2030 boards but all are 12-0-12v.
has anyone found a board they are happy with.
I have search both google and this board,,
It is to the point I enlarge the icture of a board from a hong kong supplier to see if it has 3 pad for the power,,

any help is appreciated,
Slack
  Reply With Quote
Old 21st December 2014, 05:08 PM   #2
diyAudio Member
 
Join Date: Jan 2010
TPA3116, TK2050, search to ebay, aliexpress, etc...
  Reply With Quote
Old 21st December 2014, 05:22 PM   #3
diyAudio Member
 
Join Date: Jan 2010
??? 2.1 amplifier board - ?????? ?? ?????? ????? 2.1 amplifier board ???? ?? Aliexpress.com
  Reply With Quote
Old 21st December 2014, 05:54 PM   #4
diyAudio Member
 
Join Date: Oct 2014
These are quite good for their price TPA3116D2 2.1 12v 50Wx2+100W HIFI digital subwoofer amplifier Verst board | eBay
(Left and right channel have full range output, is that okay for you, or do you need a crossover?)

Last edited by ForenSeil; 21st December 2014 at 05:57 PM.
  Reply With Quote
Old 21st December 2014, 06:07 PM   #5
diyAudio Member
 
Join Date: Dec 2014
Thanks for the quick response guys, means a lot.
I found no results for a 2.1 amp based on TK2050, they were all 2 ch.

I found a lot of 2.1 amp boards based on the TPA3116,
Power supply listed for these boards ranges from 12-25, 15-18, 12-18, etc.
I will be running off a SLA battery that I will be running down to 11.2v.

Does anyone have experience running these boards from 11v ?

Thanks,
Slack
  Reply With Quote
Old 21st December 2014, 07:15 PM   #6
diyAudio Member
 
Join Date: Jan 2010
Need use DC -DC boost 12 to 24V
  Reply With Quote
Old 21st December 2014, 07:52 PM   #7
diyAudio Member
 
Join Date: May 2013
Quote:
Originally Posted by Slackdaddy1 View Post
Starting a speaker box project with my 12 year old son.
I am finding a ton of TDA 2030 boards but all are 12-0-12v.
You can remove the bridge rectifier on there to let it work on DC. Perfect 2.1 amp for the money but they aren't very efficient (class AB).
  Reply With Quote
Old 23rd December 2014, 01:19 PM   #8
diyAudio Member
 
Join Date: Oct 2014
11V shouldn't be a problem for TPA3116D2 I guess (depending a bit on board-layout)
Actually I think most of them are still working quite well with even much lower voltages like 9V
Min. working voltage for that chip are 4.5V if I remember correctly

When you're using your box indoor you could use an old laptop power brick.

If there's a problem or you need higher output power I would simply use a ~150W step up booster (~8€) - that would make 24V out of your 12V battery and would cost ~10-20% effeciency/runtime but it's still more efficient than a Class AB like TDA2030. Some step-up+amp combinations (amps with small or no input caps and step ups with small output caps) are producing buzzing noise, in that case you would need to add an additional large capacitor (like Nichion 35V 6800F, or better several 470F ones, a few cents each) in parallel for puffering that noise. But I don't think it would be necessary.

As alternate there are dirt cheap "Lepai 838" (~10€-15$) Class D 2.1 Mini-Amps which are working well from 9V to 18V, though they don't sound as good (the subwoofer output has high distortion, stereo output is okay but not as good as TDA3116 or others) as the TDA3116 chip based boards like the one I linked above.

Last edited by ForenSeil; 23rd December 2014 at 01:41 PM.
  Reply With Quote
Old 23rd December 2014, 11:49 PM   #9
diyAudio Member
 
Join Date: Dec 2014
Forenseil,
Thank you so much for your response, very informative. I did order a 2.1 3116D2 board. I will try it off of a 12v SLA run down to 11v and see how it acts.
I plan on having the power supply, SLA battery, and charger all mounted internally with a relay or 2 switching. when the power cord is plugged in the relay would direct power from the power supply to the amp, disconnecting the battery and powering the SLA charger. I have not read any firm evidence that would lead me to believe a charger would power the amp and charge the battery safely.

Slack
  Reply With Quote
Old 26th December 2014, 04:54 AM   #10
diyAudio Member
 
Join Date: Oct 2014
Depends a lot on the quality of the charger (bad quality might cause buzzing sound etc.) and how many amperes it can deliver.

I guess you will use a small battery like 7Ah, right?

Lead/Acid batteries should not be charged with more than 1/10 of their capacity.
For example a 50Ah should not be charged with more than 5A and a 7Ah battery not with more than 700mA etc. - otherwise they start heating which does shorten their lifetime.

Though 700mA@12V are a little low to listen to music, at least at slightly elevated loudness - most likely it would charge very slow if at all while playing music

I would simply make a second power supply circuit internally, add a few switches and an old laptop power brick or similar power supply inside (something between 12V-24V DC and enough A output) - that should deliver enough to listen to music even at high loudness while you're charging your battery with a charger in parallel.

Another alternative would be to use an additional step-down module with build in voltage and current regulation (like Mini 5A Adjustable CC/CV Display Step Down Charge Module LED Panel Voltmeter -- BuyinCoins.com - simply set with a screwdriver to 14.1V and 1/10 A of your batteries Ah)- you wouldn't need a charger, only an external notebook power brick for both charging your battery and listening to music at the same time
  Reply With Quote

Reply


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
cheap single channel amp w/ bass boost on unipolar 12v Ensoniq Chip Amps 7 14th August 2014 02:16 PM
Searching for Help regarding multi channel I2S/DAC for 12V AppAttack Digital Line Level 0 5th February 2014 12:17 PM
80%+ efficiency amp running @12V single rail with 400...500W @ 8 ohms meko Class D 25 6th August 2013 03:52 PM
Single 12v and +-12v needed, What options? karmik Power Supplies 37 28th June 2011 11:27 AM
Searching for a quality amp for single 12V supply Otherwise Chip Amps 9 5th September 2006 12:54 AM


New To Site? Need Help?

All times are GMT. The time now is 01:02 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2