3886 Ebay kit Build - Page 21 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 3rd April 2012, 08:00 PM   #201
redjr is offline redjr  United States
diyAudio Member
 
Join Date: May 2011
Location: Danbury, CT
Quote:
Originally Posted by fabricated View Post
It's coming along.... just got a new batch of caps in the other day and got them soldered on. I'm still following Aguilabrava's thread to see what his final conclusion of the completed amp is. I'm having to scrap alot of the original design in favor of a more "traditional" setup.

My boy was just born this last Friday so I've kinda slowed to almost a stop here lately. I'll pick back up in a couple of days. I've checked out your DAC and I gotta admit it looks really temting
Congrats on your newborn! That event always adds a lot of excitement, stress, tension and late nights around the house. I'm taking my amp build a little slower. There's always something else I need it seems. I powered up the big toroidal today and checked the secondary voltages (without load) and they all checked out. I also discovered I needed some longer M3 screws for my IEC connector. M3 screws are not easily sourced at Home Depot, or Rat Shack. I also ordered some heavier duty binding posts that I preferred.
  Reply With Quote
Old 3rd April 2012, 08:07 PM   #202
diyAudio Member
 
Join Date: Jan 2012
Location: Des Moines, IA
Yeah it seems those tiny screws are a pain to source locally. Thanks for the congrats!

I'm just trying to get a lot more things done before I post up any more pictures. I'm already over 11,000 views and I haven't got all necessary parts in yet
  Reply With Quote
Old 3rd April 2012, 08:29 PM   #203
diyAudio Member
 
Join Date: Jan 2012
Hey, Fabricated, CONGRATULATIONS!!! I'm happy to hear that your son was born and you are back here at diyAudio.

Regarding my amp, I am very happy with it, it sounds amazing. I will be posting some pictures soon. I didn't use the input selector board and the speaker protection board, I will use them when I finally get the enclosure.

The only issue is that the heatsinks get really hot when I play it at full volume, I can't even touch them, I think I could easily fry some eggs on top of them, but I've had it playing at full volume for hours and it works perfect, no distortion or noises of any kind. I think that I will have to look for some CPU type heatsinks, and then decide on the enclosure after that.

Redjr, I looked at your thread, your amp looks really nice. I saw it on eBay yesterday or the day before and I placed it on my wish list as a good candidate for my next project. I don't know much about this, but I think you are right, it doesn't need any modifications. The only question I have is about powering it, they say that it requires 60V and 45V???
  Reply With Quote
Old 3rd April 2012, 11:40 PM   #204
diyAudio Member
 
Join Date: Jan 2012
Location: Des Moines, IA
Yeah i've heard of several people having really good results using a cpu heatsink per chip without the fans. I was thinking about doing it myself.

Keep plugging away... I'm looking forward to seeing you hook up the selector.
  Reply With Quote
Old 4th April 2012, 12:04 AM   #205
diyAudio Member
 
lanchile's Avatar
 
Join Date: Sep 2008
Location: AREA 51
Quote:
Originally Posted by fabricated View Post
Yeah i've heard of several people having really good results using a cpu heatsink per chip without the fans. I was thinking about doing it myself.

Keep plugging away... I'm looking forward to seeing you hook up the selector.
Even the quiets fans make noise and attract dust! I am not a fan of fans lol. I would never build an amp using fans to cool down amp. as long as it is a big enough heat sink to cool down amp...it will be ok.
  Reply With Quote
Old 4th April 2012, 12:39 AM   #206
redjr is offline redjr  United States
diyAudio Member
 
Join Date: May 2011
Location: Danbury, CT
Quote:
Originally Posted by Aguilabrava View Post
....Redjr, I looked at your thread, your amp looks really nice. I saw it on eBay yesterday or the day before and I placed it on my wish list as a good candidate for my next project. I don't know much about this, but I think you are right, it doesn't need any modifications. The only question I have is about powering it, they say that it requires 60V and 45V???
You don't use both voltages - either/or. My PSU will be supplying 60v rails for a class AB configuration at about 100wpc into 8ohms.
  Reply With Quote
Old 4th April 2012, 03:04 AM   #207
redjr is offline redjr  United States
diyAudio Member
 
Join Date: May 2011
Location: Danbury, CT
Quote:
Originally Posted by redjr View Post
You don't use both voltages - either/or. My PSU will be supplying 60v rails for a class AB configuration at about 100wpc into 8ohms.
Aguilabrava - Sorry, my mistake. After looking more closely at the schematic, it does appear both voltages are required. I'll need to make sure I have both voltages available. Need to do a bit more investigating....
  Reply With Quote
Old 4th April 2012, 09:11 AM   #208
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by redjr View Post
You don't use both voltages - either/or. My PSU will be supplying 60v rails for a class AB configuration at about 100wpc into 8ohms.
+-60Vdc should be approaching 200W into 8r0 if you build it right.

+-50Vdc is the norm for a 100W into 8r0 ClassAB Power Amplifier.
__________________
regards Andrew T.
  Reply With Quote
Old 4th April 2012, 11:46 AM   #209
redjr is offline redjr  United States
diyAudio Member
 
Join Date: May 2011
Location: Danbury, CT
Quote:
Originally Posted by AndrewT View Post
+-60Vdc should be approaching 200W into 8r0 if you build it right.

+-50Vdc is the norm for a 100W into 8r0 ClassAB Power Amplifier.
AndrewT - I'm moving this post and part of the discussion to my build thread here.
  Reply With Quote
Old 27th February 2014, 08:44 PM   #210
diyAudio Member
 
TUBESMAN's Avatar
 
Join Date: Apr 2004
Location: New York
Quick question about this amp. I see this: LM3886 Amplifier Amp Board Power Supply Rectifier Filter Plate LM3886TF DIY Kit | eBay
I presume it is the unit being discussed here, or one almost the same from another supplier. Most of this thread is about building an amp with it, OK nice. But. Is the kit itself in need of circuit changes? I want to buy two of them to build a bi-amped system with my Focal tweeters that I've been sitting on for years. I haven't seen any mention of mods needed to the kit itself. Is this true? I can put together my own box, power tranny, preamp, crossover etc. I just would like to know if the amp boards out of the box are OK, or do I need to tweak them.
__________________
Dedicated to the proposition that man's innate thirst for knowledge will someday overwhelm his passionate lust for stupidity.
  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
3886 kit question mbohn Chipamp 0 17th March 2011 12:05 AM
ChipAmps.Com 3886 Kit : DaveSail Chip Amps 5 30th July 2010 01:21 PM
Question on Ne5532 + 3886 amp on Ebay JackM11 Chip Amps 12 27th July 2010 02:34 PM
3886 kit LED replacement remmelt Chipamp 0 10th December 2009 09:00 PM
BrianGT's 3886 kit, a little help required.. MrSensitive Chip Amps 2 16th August 2005 01:08 PM


New To Site? Need Help?

All times are GMT. The time now is 09:42 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