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 February 2007, 11:54 PM   #1
diyAudio Member
 
tamasic1's Avatar
 
Join Date: Dec 2006
Default GCjr

Hi all -

Just finished my first gainclone amp. Bought the kit from BrianGT and the PS from Parts Express (2x22 250va). I've read a lot of threads on this board before starting this project and it all paid off. I finished without problems! Powered up and turned up the volume with no input. Speakers were dead silent even with my ear right next to the cones. Been listening to it for almost 2 hours now (jazz) and it sounds amazing. Used an old IBM PCjr computer for the case and it looks pretty cool.

http://bellsouthpwp2.net/k/a/karlet/Amp/GCjr.jpg
  Reply With Quote
Old 4th February 2007, 02:36 AM   #2
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
LOL! thats cool. does the CD drive actually work or are you planning to make it work?
  Reply With Quote
Old 4th February 2007, 02:48 PM   #3
diyAudio Member
 
tamasic1's Avatar
 
Join Date: Dec 2006
Default CD drive

Thanks, I thought people might get a kick seeing this if they ever owned a PCjr. At the moment the CD does not work I put it there just for looks right now but I do plan to make it work. Cool thing about the PCjr is the add-on modules that were created for it. I will probably add the 2nd drive chassis and move the toroid and power board inside it then add a second toroid to power a preamp and CD player. Iíll place the preamp boards in the main chassis where the toroid is now. It will separate power from the main unit.
Right now Iím taking the advice of so many Iíve read here: Ďjust build the amp and listení
Modding can wait for now. Listening to Obscured by the Clouds Ė Echoes sounds amazing!

Hereís a couple more pics:
This is how I modified the drive assy. http://bellsouthpwp2.net/k/a/karlet/Amp/DriveBay.JPG
This is a second drive module
http://bellsouthpwp2.net/k/a/karlet/Amp/Drive2.jpg
  Reply With Quote
Old 5th February 2007, 03:07 PM   #4
diyAudio Member
 
tamasic1's Avatar
 
Join Date: Dec 2006
Default inside

Here's a better pic of the inside. Nothing out of the ordinary. Star ground and chassis ground are on the same terminal strip but they do not connect to each other. Many post I've read said not to connect the amp boards directly to chassis ground. I followed their advice and added a 10 ohm resistor between each board and the chassis ground point.

http://bellsouthpwp2.net/k/a/karlet/Amp/inside1.JPG
  Reply With Quote
Old 6th February 2007, 12:13 PM   #5
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Nice use of a PCjr

--
Brian
  Reply With Quote
Old 6th February 2007, 12:32 PM   #6
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Now you just need to build an aquarium into the monitor part...
  Reply With Quote
Old 6th February 2007, 04:02 PM   #7
diyAudio Member
 
tamasic1's Avatar
 
Join Date: Dec 2006
Default Been there, done that, etc ....

Nordic, ask and you shall receive ........

http://bellsouthpwp2.net/k/a/karlet/Amp/MacQuarium1.JPG
http://bellsouthpwp2.net/k/a/karlet/Amp/MacQuarium2.JPG

I built this over 10yrs ago from scratch and it's still going strong. The fluorescent light was a nice touch.

...and no, I'm not putting it on top of the amp.
  Reply With Quote
Old 6th February 2007, 04:55 PM   #8
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Am I not the coolest
  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



New To Site? Need Help?

All times are GMT. The time now is 07:01 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