Numbnut builds chipamp..success!! - 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 14th March 2006, 03:53 PM   #1
eddog is offline eddog  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Small Town in Minnesota
Default Numbnut builds chipamp..success!!

First thanks for all the great info posted on this site, without it I wouldnt have discovered this incredible little amp. In my case a LM3875 rev 3 kit. Firstly I managed to but the caps in backwards on the amp cards. After discovering this mistake my amp was clipping very badly, after much anguish I found that my "regulated" DC power supply was malfunctioning and giving me incorrect voltages for the rails. Then I had my signal ground inputs wired incorrectly(not to ground). Even after all this(including one exploding cap)the amp is now running and making great sounds. I really can't believe it after the abuse I put it through. I have one question concerning what I percieve to be a slight "tsk,tsk" yness to cymbals. Is thier anyone else'samp with this quality? It may be my speakers tweeters though as they are cheap goldwoods that replaced the OEM's that got blown up by the Evil Powers of Rock and Roll!
  Reply With Quote
Old 14th March 2006, 03:58 PM   #2
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Give it a week or so, they sometimes sound less than nice right at the start, but with some burn in, you and the amp will get more used to each other.
  Reply With Quote
Old 14th March 2006, 05:29 PM   #3
Garnett is offline Garnett  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: London
This is great news!

There's hope for me yet. My kit arrives any day, and I'm looking forward to a similarly seamless build.

Well done. Have you enclosed it yet? Any chance of some pics?

Are there any additional instructions you found particularly useful that you can recommend? Or any top tips (other than those you've already mentioned) for fellow electrically hindered newbies?
__________________
Usually mitigation for all my dumb questions: I will endeavour to make sure I explain everything I find out on www.substitutereality.co.uk so that other newbies like me have a useful resource to check first...
  Reply With Quote
Old 14th March 2006, 05:41 PM   #4
kmj is offline kmj  Sweden
diyAudio Member
 
kmj's Avatar
 
Join Date: Feb 2004
Location: Falkenberg
Congratulations Numbnut!!

Sorry, couldn't resist
  Reply With Quote
Old 14th March 2006, 05:42 PM   #5
eddog is offline eddog  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Small Town in Minnesota
Sorry, no digital camera. Imagine a cardboard box with a bunch of wires coming out of it and you have my current enclousure I am using some old heatsinks from an old RCA stereo about 2.5" X 6" X 1/4" and it seems to be enough for my low volume needs. The best build advice I can give is "relax and have a homebrew" and if you have enough batteries to = 24volts, use those as the amp is completely silent that way. Dont worry too much about the feedback resistor and mount it on the PCboard if you feel uncomfortable soldering it to the pins. I know I was worried about the whole grounding issues, but if you check and double check your wiring you will be alright. These chips seems to be able to handle lots of brainfarts and still work. Good Luck. By the way, I was able to visit London last summer with a group of high school kids(prior to the bombing) and really had a great time there. Great city and great beer!!
  Reply With Quote
Old 14th March 2006, 05:48 PM   #6
eddog is offline eddog  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Small Town in Minnesota
Quote:
Originally posted by kmj
Congratulations Numbnut!!

Sorry, couldn't resist

Absolutely! Glad to see it's a global expression
  Reply With Quote
Old 17th March 2006, 05:20 PM   #7
eddog is offline eddog  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Small Town in Minnesota
Quote:
Originally posted by Nordic
Give it a week or so, they sometimes sound less than nice right at the start, but with some burn in, you and the amp will get more used to each other.

What you said!! The amp has exceeded all expectations, the treble seems to have mellowed yet still retain it's clarity and the bottom end just floors me. I was listening to an old Blue Oyster Cult track "I love the night" today and was just amazed at the detail. For 35 bucks these amps are the worlds best bargain.
Good luck to all who build these, hope yours turns out as well as mine did.
  Reply With Quote
Old 19th March 2006, 05:19 AM   #8
diyAudio Member
 
Join Date: Nov 2005
Default LM3875 rev 3 kit

Where was the kit purchased from?


Mark
  Reply With Quote
Old 19th March 2006, 05:46 AM   #9
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
from the sound of it it was a brianGT kit from chipamp.com
i have a couple of the first version ones running and they are great. better than anything i ever bought
  Reply With Quote
Old 20th March 2006, 02:07 PM   #10
eddog is offline eddog  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Small Town in Minnesota
Yep it was Brians kit.
  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
Successful builds using Extremis in a TL? Shaun Multi-Way 0 24th November 2007 03:29 PM
My first speaker builds - Thanks for the help stuartdj_x Multi-Way 13 19th October 2005 02:06 PM
so who here builds amps amp builder jb Tubes / Valves 29 15th July 2005 09:23 PM


New To Site? Need Help?

All times are GMT. The time now is 07:51 AM.


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