I'm ready to GAINCLONE!!!! - 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 10th January 2006, 12:38 AM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: Fairmount, GA
Default I'm ready to GAINCLONE!!!!

After buying my Son an MP3 player for Christmas I started looking into songs I could down load for him. I really got in the mood to seriuosly listen to music again. I even got the pair of little Bose out of the closet and hooked them up to a small amp and CD player. Knowing that even tho it was enjoyable, the little 5 watter was robing my of the full sound.

So, needing a good amp, I started searching on the net and got into the DIY/Gainclone thing. Since I have a very small budget, I realised that after I got the amp and built it, I would have to save again untill I got the transformer. Then, lo and behold, (this must be a sign ), I had one slapped in my hand from a buddy who had no idea of my new project!

So here is the plan. I am convinced that the best way to go about this is to get the LM3875 kit from Chipamp.com. It's a convient pacage with enough left to do that you still feel like you built yourself. For the supply, I have a 250VA center taped transformer that puts out 36 volts to center tap.

I have a pair of Bose 201 speakers (8 ohm) that I will use as "close feild monitors". No real intensions to fill up a room. In fact IMHO, close feild monitoring is the best way to hear the sound the producer intended, sense room accoustics hardly inter into effect.

Any opinions as to what results I will get, or problems I should anticipate are very much appreciated.

Thanks in advance,
David
Fairmount, GA USA
__________________
Poor stereo mix? Switch to mono! Perfect.
  Reply With Quote
Old 10th January 2006, 12:49 AM   #2
Variac is offline Variac  United States
diyAudio Editor
 
Variac's Avatar
 
Join Date: Dec 2001
Location: San Francisco, USA
Seems like a fine plan. The chip amp will be good enough that you are on a logical path towards a decent system. It won't need to be replaced, so you can next focus on building some good cheap speakers!

The amp will be louder than you expect..
  Reply With Quote
Old 10th January 2006, 12:56 AM   #3
diyAudio Member
 
Join Date: Jan 2006
Location: Fairmount, GA
Thanks. BTW, the Bose 201s make excellant close field monitors.
__________________
Poor stereo mix? Switch to mono! Perfect.
  Reply With Quote
Old 10th January 2006, 09:32 AM   #4
Bazukaz is offline Bazukaz  Lithuania
diyAudio Member
 
Bazukaz's Avatar
 
Join Date: Nov 2005
Location: Vilnius
Send a message via Skype™ to Bazukaz
I would like to ask , what are real advantages of gainclone ?
  Reply With Quote
Old 10th January 2006, 09:42 AM   #5
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Quote:
Originally posted by Bazukaz
I would like to ask , what are real advantages of gainclone ?
If built coreectly, they sound much better than they should for very little money.

David, just to check, is the 36V your transformer puts out before or after rectification? If before, it will likely be a little too high for a gainclone, 36x1.41=50V DC.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 10th January 2006, 09:45 AM   #6
Vikash is offline Vikash  United Kingdom
diyAudio Moderator Emeritus
 
Vikash's Avatar
 
Join Date: May 2003
Location: UK
Simplicity, cost, and sound quality.

Trafo might be too high. You want 18-25v trafo for lm3875.

edit: doh! the mouse beat me to it.
__________________
"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)
  Reply With Quote
Old 10th January 2006, 09:50 AM   #7
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
'S ok. It's always nice to have backup!
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 10th January 2006, 12:25 PM   #8
diyAudio Member
 
Join Date: Jan 2006
Location: Fairmount, GA
Bazukaz and pinkmouse,

Ok so..... Am I back to day one? Help me with this. Is it possible that I could use a Zener to get the voltage down? Or do I need to shop for another transformer?

If the latter, does anyone know where I can get one cheap? :-)


Thanks to all for posting!!
__________________
Poor stereo mix? Switch to mono! Perfect.
  Reply With Quote
Old 10th January 2006, 12:47 PM   #9
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
You really need the correct transformer unless you want to get complicated and use a voltage regulator. If you do a search in the chip amps thread you should find many recommendations.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 10th January 2006, 01:00 PM   #10
diyAudio Member
 
Join Date: Jan 2006
Location: Fairmount, GA
Ok, you've convinced me. It's kinda embarassing but, I'm really limited on my budget. I have an ex employer who has a huge surplus of 120/24V single secondary transformers. I'm pretty sure he would let me have a pair. Would that work well? What VA would you recommend for minimum?

Thanks all.
__________________
Poor stereo mix? Switch to mono! Perfect.
  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
my new toy, ready to play :) cowanrg Everything Else 7 7th July 2013 04:45 PM
My TT is finaly ready IZHAKKATZ Analogue Source 10 16th February 2009 02:57 PM
Ready to Learn GrahamH Introductions 11 11th February 2009 08:16 PM
My little beast is getting ready.. johnny1 Solid State 27 21st September 2006 02:39 PM
Ready to build my Gainclone ebijma Chip Amps 34 20th September 2004 06:01 PM


New To Site? Need Help?

All times are GMT. The time now is 11:00 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