DROK LM3886TF 60W 20~28V amplifier on Amazon Prime - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 14th May 2016, 12:09 AM   #1
diyAudio Member
 
Join Date: Nov 2003
Location: Austin, TX
Default DROK LM3886TF 60W 20~28V amplifier on Amazon Prime

Anyone familiar with this amp?
I'm looking for something small like this, that does not have volume knobs or anything else sticking out of it (space constraints in enclosure).

Amazon.com: DROK HI-FI Digital Stereo Power Amp Circuit LM3886TF Small Audio Amplifier IC Mono 60W AC 20~28V: Electronics

Product Model:LM3886TF
  • Operating Voltage:AC 20V~28V
  • Output Power: 60W
  • Resistance:1% copper foot metal film
  • Can monolithic or used in parallel

Basically, I'm wondering what type of power I'll get with my application?
I've got a single 4 ohm, power hungry speaker.
And I think my battery setup will be ~12 volts?

Then I've got the following battery/case/charger setup:

3 each 18650 batteries
http://www.amazon.com/18650-Recharge...ilpage_o01_s00



battery case for three 18650 batteries wired in series.
http://www.amazon.com/uxcell-Battery...ilpage_o00_s00



And this is the charger I got to charge the batteries with.
The speaker will rarely ever be connected to the charger while playing audio.
Amazon.com: 90W AC Power Adapter/Battery Charger for Toshiba Satellite A135-S7406 A205 A205-S5000 A305 A305-S6916 A505 A505-S6980 L305D L305D-S5934 L40-139 L455D-S5976 M305D-S4830 P205-S6267 U405D-S2850: Computers & Accessories
Attached Images
File Type: jpg 51knFVL2eFL.jpg (34.8 KB, 75 views)
  Reply With Quote
Old 14th May 2016, 12:20 AM   #2
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 142
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
You need a balanced supply for this, so 3 18650 won't cut it, it should be 6.
__________________
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
  Reply With Quote
Old 14th May 2016, 12:29 AM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Austin, TX
Whoah. Okay, thanks.
Crud.
Okay, just bought a couple of these 18650 protection boards then.
Two boards for six batteries:
10A bms Charger Protection Board for Pack of 3 18650 Li ion Lithium Battery Cell | eBay
  Reply With Quote
Old 14th May 2016, 12:31 AM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Austin, TX
Any suggestions on a heatsink to add to it?
I'm guessing that's the only other thing I'll need, aside from the Bluetooth board which I already have.
  Reply With Quote
Old 14th May 2016, 12:41 AM   #5
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 142
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
You'll want something the full width of the PCB and the height should be say 75mm with a depth of at least 30mm. Choose a black anodized one over plain shiny aluminium.

As regards to power output, with 6 cells into 4ohms, you'll have about 8WRMS.
__________________
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
  Reply With Quote
Old 14th May 2016, 12:52 AM   #6
diyAudio Member
 
Join Date: Nov 2003
Location: Austin, TX
8 Watts?
So is the 60 watt rating just specs BS or is this a limitation of the battery pack?

I need about 33 watts minimum for my single channel portable speaker and it's got to run on battery. Any suggestions?

I appreciate the help. I'm way out of my knowledge level when it comes to this battery pack stuff.
  Reply With Quote
Old 14th May 2016, 12:54 AM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Austin, TX
I ended up buying this board instead.
It's been talked a lot about on this forum so I'll start researching all the threads this evening.

DC 12V-24V TPA3118 BTL 60W Mono Digital Audio Power Amplifier Board Module M374
DC 12V-24V TPA3118 BTL 60W Mono Digital Audio Power Amplifier Board Module M374
Attached Images
File Type: jpg s-l1600.jpg (144.7 KB, 68 views)
  Reply With Quote
Old 14th May 2016, 12:57 AM   #8
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 142
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Yes, you're limited by your relatively low voltage battery pack. 60W is achievable but you'd need something like 70V total supply as well as a bigger heatsink. I was going to suggest classD but I see you've already discovered that

Note that with this new board and the same 6 cells you'll get round about your target power. However 6 freshly charged 18650s will exceed the maximum voltage rating so I'd suggest reducing the number to 5.
__________________
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
  Reply With Quote
Old 14th May 2016, 12:58 AM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Austin, TX
Quote:
Originally Posted by abraxalito View Post
Note that with this new board and the same 6 cells you'll get round about your target power.
YESSS... thank you
  Reply With Quote
Old 14th May 2016, 01:29 AM   #10
diyAudio Member
 
Join Date: Nov 2003
Location: Austin, TX
OMG, I'm such a dumbass.
I already have a board that I bought a couple weeks ago and forgot about. lol
http://store3.sure-electronics.com/aa-ja32171-1514
  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
[Q] Lepai TA-2020+ is the best sub-$30 option on Amazon Prime that comes with PSU? CZ Eddie Class D 0 10th February 2014 11:19 PM
6N11+TDA7293 60W+60W Amplifiers fn9mm Chip Amps 5 28th August 2011 01:37 PM
ISO Chip Amp to Use 28v-0-28v, 2A Toroid DreadPirate Chip Amps 1 14th November 2007 03:01 PM
Non Bootstraped amplifier 60W IrishboyM4 Solid State 14 23rd April 2007 11:53 PM
60w in 8 ohms ESP amplifier... Lisandro_P Solid State 15 19th April 2001 06:20 PM


New To Site? Need Help?

All times are GMT. The time now is 04:11 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki