Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 11th May 2011, 02:18 AM   #711
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
My F5 Summertime Edition (I had to add ventilation slots). Still wondering if I should have written F5 the other way around. In the process I also changed the output devices. I prefer the Toshiba, beside the fact that they have much less measurable distortion.

Best Regards,

Davide

Edit: Don't know why the site display the picture upside down.
Attached Images
File Type: jpg photob.JPG (137.1 KB, 2420 views)
File Type: jpg photod.JPG (118.4 KB, 2369 views)

Last edited by Nikon1975; 11th May 2011 at 02:25 AM.
  Reply With Quote
Old 11th May 2011, 03:58 AM   #712
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Quote:
Originally Posted by Nikon1975 View Post
My F5 Summertime Edition (I had to add ventilation slots). Still wondering if I should have written F5 the other way around. In the process I also changed the output devices. I prefer the Toshiba, beside the fact that they have much less measurable distortion.

Best Regards,

Davide

Edit: Don't know why the site display the picture upside down.
Which Toshiba devices are you using?
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com
  Reply With Quote
Old 11th May 2011, 07:55 AM   #713
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
I am using 2SK1530/2SJ201. The first try was a textbook F5, with IRF. The actual one has no termistors and no current limiting. I may add the current limiting when the terror todler comes back home after summer. He likes to play with the speakers cables, and already once he shorted the output. The fuse blowed before the MOSFET.

This time I trimmed the distortion down, but I think that the main benefit comes from the fact that N and P parts are complementary, although mine are not matched.

BR,

Davide
  Reply With Quote
Old 12th May 2011, 02:49 AM   #714
diyAudio Member
 
Join Date: Sep 2006
Location: Santa Rosa Beach, FL
Quote:
Originally Posted by Nikon1975 View Post
My F5 Summertime Edition (I had to add ventilation slots). Still wondering if I should have written F5 the other way around.
Davide, by "written F5 the other way around", do you mean so that it's more easily read from the other end of the amp? If so, it almost looks as though your screw holes are symmetrical--can it be as easy as unscrewing and rotating the top cover? (Although I suspect you've already considered that...!)

Great looking job, and good choice of semiconductors......
  Reply With Quote
Old 12th May 2011, 09:55 AM   #715
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
Yes, the holes are symmetrical, but then it makes less sense of the heat dissipation point of view, as the lower air inlet now are below the bigger ventilation grid. Probably it will not change much.

D.
  Reply With Quote
Old 13th May 2011, 08:43 PM   #716
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
nice work Davide!!
  Reply With Quote
Old 27th May 2011, 06:43 PM   #717
diyAudio Member
 
merlin2069er's Avatar
 
Join Date: Sep 2008
Location: Toronto
Blog Entries: 1
Send a message via MSN to merlin2069er
Default F5 alive!

I posted a quick video on youtube... with my bias readings...

YouTube - f5 amp

I've also got an initial sound demo (connected to my ipod & optimus speakers)
(ok, they're my computer desktop speakers )

http://www.youtube.com/watch?v=VW7MWNZsZUs

(this is private if you want to see this, send me an IM with your youtube id, or email address)
  Reply With Quote
Old 28th May 2011, 04:24 PM   #718
diyAudio Member
 
Join Date: Jul 2010
Location: the hague
Default Another F5

It has been playing all day now and I should have listened to everybody here about the heatsink rotation. (it gets bloody hot). But other then that it sounds brilliant. Re-living all my favorite recordings. Now I'll take it apart again and build it properly.
Thanks Nelson!
Attached Images
File Type: jpg 006kl.jpg (119.4 KB, 1727 views)
File Type: jpg 007kl.jpg (88.5 KB, 1677 views)
File Type: jpg 008kl.jpg (97.7 KB, 1594 views)
  Reply With Quote
Old 29th May 2011, 07:35 PM   #719
Preamp is online now Preamp  Germany
diyAudio Member
 
Join Date: Jul 2008
Location: North Sea
Default Zen build from scrap ;)

This is the first Zen I've build, simply to find out how it sounds and to make some use of salvaged parts I had lying around. It is not exactly beautiful, but made almost completely out of scrap . Along with that it is quite compact, measures only 'bout 14cm x 24cm x 29cm. I got it almost finished today, it is only missing an adequate fan controller. Well, a 'power' LED too.

I didn't test it yet, since I don't have a variac here at home. I'll do that tomorrow at work. I'm a bit afraid to simply plug it in and see what happens...

Here's some info on the parts I used:
Toroid with 2 secondaries, 24V/6,2A each
2 huge capacitors rated 180'000uF at 35V, Nippon Chemi-Con
2 air core coils 1,5mH made of 18 gauge (1mm diam.) copper wire
another 2 caps 15'000uF/50V each
heatsink 8cm x 8cm x 20cm w/ Papst fan (got that from eBay some years ago)
nice aluminum case equipped with a huge mains filter
Simply astonishing what people throw away !


The amplifier itself is built on perfboard with each power transistor mounted on one part of the heatsink, which is comprised of four equal profiles. I didn't spend the amp a volume pot, since it's going to be placed somewhere near the bottom, next to my PC. Since the computer also uses a fan, the one in the amp won't be much of a problem. At least I hope so .


Regards,
Lasse
Attached Images
File Type: jpg scrapzen01.jpg (191.9 KB, 905 views)
File Type: jpg scrapzen02.jpg (903.1 KB, 969 views)
__________________
Regards, Lasse
  Reply With Quote
Old 29th May 2011, 09:24 PM   #720
diyAudio Member
 
Andersonix's Avatar
 
Join Date: Jan 2004
Location: Silicon Valley
Lasse, admirable use of 'scrap' and terrific packaging efficiency! Maybe get some more colors for your wire collection to help prevent confusion?
  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
DIY Low Pass and Mid/High Pass (Bass Blocking) Filters runslikealpaca Everything Else 1 19th June 2009 10:59 PM
Naked pictures of Pass Pete Fleming Pass Labs 30 9th December 2006 06:39 AM
My new hifi amplifier (pictures) Wejp Chip Amps 23 15th October 2004 12:16 AM
Pass Diy High Low Pass Please macka Pass Labs 127 2nd March 2004 11:00 PM
DIY Pass labs 100watt amplifier. microwalsh8504 Pass Labs 12 6th February 2004 07:27 PM


New To Site? Need Help?

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