Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Burning Amplifier BA-1
Burning Amplifier BA-1
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 9th September 2019, 11:51 AM   #361
Rush is offline Rush  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Tarpon Springs, Florida
Default BA-1 Single Ended

I have collected the transformers and associated parts to build this and other amps. Now that I am retired, I have some choices to make.

My intention is to build a single ended 3 pairs per channel IRFP040 (12 total both channels) stereo amp.

I have 4 ohm speakers and need some advise which voltage 1000 VA transformer I should use to maximize output power at 4 ohms.

I am using current inventory, not buying anything new, if I can help it.
Antek 1000VA:
So a 0-18, 0-18, 0-18, 0-18 VAC (23 VDC 1 amp per device)
Or a 0-25, 0-25, 0-25, 0-25 VAC (32 VDC .75 amp per device)

Which transformer would be best to use?

My heatsinks will handle over 150 watts per side.

Rush
  Reply With Quote
Old 9th September 2019, 12:03 PM   #362
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Burning Amplifier BA-1
18Vac
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 9th September 2019, 12:18 PM   #363
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Burning Amplifier BA-1
Quote:
Originally Posted by cobar53 View Post
I am not in any way gifted in electronics. I have been trying to assemble the BA-1 and do not understand how to interface the front end and output stage.
It seems to revolve around D and S but it is unclear to me

Any advice would be appreciated
see pic

Quote:
Originally Posted by Rush View Post
I have collected the transformers.....
more than 3 pairs per channel could be wise
Attached Images
File Type: jpg BA-1 complete.jpg (282.0 KB, 100 views)
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 9th September 2019, 01:05 PM   #364
Rush is offline Rush  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Tarpon Springs, Florida
[QUOTE=Zen Mod;5909586

more than 3 pairs per channel could be wise [/QUOTE]

ZM,

Well, I only have 12 matched devices. I don't think you can buy them anymore.

Rush
  Reply With Quote
Old 9th September 2019, 01:14 PM   #365
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Burning Amplifier BA-1
in that case , just crank 'em
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 9th September 2019, 01:49 PM   #366
Dennis Hui is offline Dennis Hui  Canada
Hoopy Frood
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Burning Amplifier BA-1
Wow...IRFP040? I seem to recall those were pretty rare even back in the original Zen days.
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 9th September 2019, 02:29 PM   #367
Rush is offline Rush  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Tarpon Springs, Florida
Quote:
Originally Posted by Dennis Hui View Post
Wow...IRFP040? I seem to recall those were pretty rare even back in the original Zen days.
Dennis,

I think so.
Someone said they sounded better than currently available Mosfets, but that is probably because you can't get them, even back then. If they are unobtainium, then of course they sound better!

Rush
  Reply With Quote
Old 9th September 2019, 04:56 PM   #368
indra1 is offline indra1  Indonesia
diyAudio Member
 
Join Date: Nov 2010
Location: Bogor
On alternative mosfets for Zen amp :
Quote:
Originally Posted by Nelson Pass View Post
... the best choice for the N channel device in my experience is the IRFP040, which is no longer made.

The 040 is doped a little differently than the 140 or 240 and the lower withstand voltage comes with higher transconductance, which accounts for the better performance...
On IRFP040 vs. IRFP044 :
Quote:
Originally Posted by Nelson Pass View Post
The real difference is that you can get the 044's. I just scored a thousand of them.
Thus The Wizard hath spoken.
  Reply With Quote
Old 11th September 2019, 10:27 AM   #369
cobar53 is offline cobar53  Australia
diyAudio Member
 
Join Date: Feb 2014
Location: Canberra
Smile Thank you for the help. It is clear now

Quote:
Originally Posted by Zen Mod View Post
see pic



more than 3 pairs per channel could be wise
  Reply With Quote

Reply


Burning Amplifier BA-1Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Burning Amplifier BA-2 Variac Pass Labs 1131 3rd December 2018 10:22 PM
Burning Amplifier BA-1 Nelson Pass diyAudio.com Articles 3 24th October 2011 02:53 AM
Burning Amplifier BA-2 Nelson Pass diyAudio.com Articles 5 14th September 2011 06:11 PM


New To Site? Need Help?

All times are GMT. The time now is 04:01 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki