Commercial Gainclone kit- building instructions - Page 9 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Audio Sector

Audio Sector Kits & PC boards from AudioSector

Reply
 
Thread Tools Search this Thread
Old 27th May 2008, 06:16 AM   #81
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
We can also notice that with volume turned down, the rails are at 32.6V DC. So under full power they drop by 2V.
Attached Images
File Type: jpg p11.jpg (97.8 KB, 8531 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 06:56 AM   #82
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I do the same test for 4ohm load (8 resistors in parallel) and initially we can see 56W power output with rails going down even further to 29.5V.
Attached Images
File Type: jpg p3.jpg (98.3 KB, 8401 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 06:59 AM   #83
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
However, as the heatsinks warm up (and it happens really fast), the power colapses down to 10W or so. Those heatsinks are definitely not suitable for 4ohm loads under full power.
Attached Images
File Type: jpg p4.jpg (97.6 KB, 6184 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 07:11 AM   #84
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
The frequency response is approx 4Hz-240kHz (-3dB)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 07:22 AM   #85
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
There is one other thing we can check tonight: lets disconnect one of the rails and see what happens with DC offset.

I disconnect the negative rail first.
Attached Images
File Type: jpg r1.jpg (99.6 KB, 7101 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 07:24 AM   #86
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Without any load connected, we measure 31.7V DC at the output.
Attached Images
File Type: jpg r2.jpg (94.1 KB, 6457 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 07:44 AM   #87
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
After we connect the dummy load, the DC offset drops down to 75mV. In my test, it does not happen right away though, but takes approx a second or so for the voltage to drop.

I did try it with a test speaker and unfortunately the DC voltage was still present (at 24V or so)
Attached Images
File Type: jpg r3.jpg (99.1 KB, 6924 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 07:53 AM   #88
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
With positive rail disconnected and no load the DC offset is approx 7V.
Attached Images
File Type: jpg r4.jpg (88.8 KB, 6748 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 07:58 AM   #89
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
With test speaker connected, the voltage drops immediately down to 70mV and there is no danger whatsoever to the speaker.

The above findings are quite interesting and surprising. It was reported few times on a forum, that there is no danger to the speakers when one rail disappears, however, it seems like this is only the case with the positive rail. With a negative supply disconnected, I couldn't eliminate DC offset with my test speaker, although with a dummy load, the offset was going down indeed.

That Blaupunkt car speaker took 24V for at least 4 seconds many times over and still didn't suffer any damage
Attached Images
File Type: jpg r5.jpg (98.4 KB, 7135 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 27th May 2008, 07:04 PM   #90
sneih is offline sneih  Indonesia
diyAudio Member
 
sneih's Avatar
 
Join Date: May 2008
thanks bro....
  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
Commercial complete Gainclone kit for a beginner? gychang Chip Amps 365 4th October 2011 09:19 AM


New To Site? Need Help?

All times are GMT. The time now is 03:11 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