F5 power amplifier - Page 1174 - diyAudio
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 24th January 2012, 05:35 PM   #11731
diyAudio Member
 
Join Date: Jan 2008
Im sorry, by official I meant F5 from Firstwatt as pictures can be seen on 6moon website.

So how do you determine which of the mosfets should have lower source resistor?

Thanks.
  Reply With Quote
Old 24th January 2012, 07:34 PM   #11732
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Any imbalance found in the circuit is adjusted by P3.

  Reply With Quote
Old 26th January 2012, 07:20 PM   #11733
lykkedk is offline lykkedk  Denmark
diyAudio Member
 
Join Date: Dec 2002
Location: Denmark, Fredericia
Send a message via MSN to lykkedk
Well... Could not wait anymore for Turbo F5

I ripped one of mine F4's apart, did a new pcb, and fired it up today.


The offsett was a little jumpy at first, but when the IRF's was getting hot, it stabilised nicely... actually very near 0mV.

I had no problem, adjusting the Bias at 0,6V. So first quick test was fine, with 2K2 across trimpot's.


Next i will assamble it with heatsink compound, and try to give it a listning.

Jesper.
Attached Images
File Type: jpg Bias1.JPG (95.9 KB, 545 views)
__________________
/// got to catch up again ///
  Reply With Quote
Old 26th January 2012, 09:16 PM   #11734
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
funny Danes

all having same heatsinks

__________________
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 26th January 2012, 09:17 PM   #11735
Rush is offline Rush  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Tampa, Florida
You sure do have a lot of thermal connections between the output transistors and the heat sink. Can't help but think mounting the transistors directly on the heat sink would transfer the heat better (I see the copper pad, but still). Use a piece of the U bracket to mount the F5 board at 90 degrees.
Secondly, looks like my wife's dining room table during my last amp build. Hope you can get the paint and thermal compound off before she gets home!
  Reply With Quote
Old 26th January 2012, 10:12 PM   #11736
a.wayne is offline a.wayne  United States
diyAudio Member
 
a.wayne's Avatar
 
Join Date: May 2008
Location: Front Row Center
Quote:
Originally Posted by Zen Mod View Post
funny Danes

all having same heatsinks

  Reply With Quote
Old 26th January 2012, 11:48 PM   #11737
diyAudio Member
 
Malotron's Avatar
 
Join Date: Sep 2005
Location: Kaimuki
At least he's at the dinner table, my F5 testing is relegated to the buffet
Attached Images
File Type: jpg F5 Buffet.jpg (478.3 KB, 498 views)
  Reply With Quote
Old 27th January 2012, 12:30 AM   #11738
1MOR is offline 1MOR  United States
diyAudio Member
 
Join Date: Jul 2008
Quote:
Originally Posted by Malotron View Post
At least he's at the dinner table, my F5 testing is relegated to the buffet
Nice Tiger Oak!
  Reply With Quote
Old 27th January 2012, 01:02 AM   #11739
diyAudio Member
 
Malotron's Avatar
 
Join Date: Sep 2005
Location: Kaimuki
JIMMIE
Oak's nice.

lykkedk - If you bolt those outputs directly to the heat sinks they may even be F5 TURBO Capable
  Reply With Quote
Old 27th January 2012, 01:19 AM   #11740
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
lykkkkkk knows that

you can see that's temporary setup
__________________
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

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
Rockford Fosgate Power 20001 bd amplifier power rating?? pachoorion Car Audio 8 8th May 2011 10:49 PM
Power transformers versus amplifier output power..what is your option? destroyer X Solid State 38 9th May 2009 05:23 PM
McIntosh Power Amplifier Power Guard johnnyrt Solid State 2 23rd August 2007 10:22 PM
Output power for a power amplifier Progg70 Solid State 33 10th September 2006 08:44 AM
Amplifier 3000 Wats Rms Power + Smps Higcht Power Bestiality MARAVILLASAUDIO Class D 1 5th November 2004 04:06 PM


New To Site? Need Help?

All times are GMT. The time now is 10:08 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