An illustrated guide to building an F5 - Page 13 - 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 3rd June 2011, 07:51 PM   #121
diyAudio Member
 
Join Date: Sep 2006
Location: Santa Rosa Beach, FL
Oh...... Rifa's are CAPACITORS.....! They look big enough to be cans of beer!

LOL
  Reply With Quote
Old 4th June 2011, 12:03 AM   #122
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Beads are there because I put the rest of the ceramic beads somewhere safe And now can not find them.
Yes insulation and heath resistant.
At first 1 Thermistor whit larger fuse was ok
Now smaller fuse 2 thermistors.

Thermistors get hot so insulating beads.
But now no more hot thermistors as relay By pass.
I am going to keep the beads there just in case I loose those as well (and if relay fail)
Caps
They are only litle baby 10mU 40 V (actualy 8 on back order)
so just 200mU rail.
Had the same ammount of Samwha shown in the box
I like litle ones beter than the big ones. More way to do things, cheaper than replace,Price breack for quantity.
Fit well in the 3U enclosure
ha almost forgot much lower ESR than big ones especialy when a few in paralel

Would it sound better with the Rifa?
Probably me think.

Nah only Alcool pop size 65 X35od 2 1/2 x 1 3/8
  Reply With Quote
Old 5th June 2011, 07:57 PM   #123
diyAudio Member
 
merlin2069er's Avatar
 
Join Date: Sep 2008
Location: Toronto
Blog Entries: 1
Send a message via MSN to merlin2069er
I'm having problems with my right channel. I popped a fuse yesterday after listening for about .5 hr.

I opened it up to take a look at it, and V- side of the board (r18, r16, r14) and .47ohm 3w resistors are a bit blackened.

r16 being the worst.

The left channel looks great.

I can post a pic of that board.

I can replace the resistors, but what might have cause the problems with that channel?
  Reply With Quote
Old 5th June 2011, 08:05 PM   #124
diyAudio Member
 
Andersonix's Avatar
 
Join Date: Jan 2004
Location: Silicon Valley
Are you measuring 'open circuit' between output transistor gate pin and hs? Sometimes an insulator pad can be cut, shorting the transistor to the hs.
  Reply With Quote
Old 5th June 2011, 08:08 PM   #125
Itsmee is offline Itsmee  England
diyAudio Member
 
Itsmee's Avatar
 
Join Date: Feb 2009
Quote:
Originally Posted by merlin2069er View Post
I'm having problems with my right channel......

I can replace the resistors, but what might have cause the problems with that channel?
Q4

Also replace Q6, it should have shut off the MOSFET

Last edited by Itsmee; 5th June 2011 at 08:12 PM.
  Reply With Quote
Old 5th June 2011, 08:23 PM   #126
diyAudio Member
 
merlin2069er's Avatar
 
Join Date: Sep 2008
Location: Toronto
Blog Entries: 1
Send a message via MSN to merlin2069er
I removed the board from the heat sink. I'll replace the resistors, the insulators, and maybe order a spare mosfet.
  Reply With Quote
Old 6th June 2011, 10:17 AM   #127
diyAudio Member
 
Join Date: Sep 2009
Location: Spain
Default my blue F5

Hi all

I finished my F5.

I mounted two mono F5. I used clear plastic to make the chassis.

- 300VA transformer
-bridge rectifier are mur3020 (fast recovery)
- 4 x 15000 uF Nippon Chemicon, for each channel
- tech-diy kit
- flexible LED strip light inside
- increased resistance R3 and R4 on a channel to reach the bias.

Are under the bias adjuster, about 0.59 V. About two hours, the bias is 0.59 V and the offset is 0 mV, but with this setting when you turn the bias is 0,50v and the offset is 34 mV. I guess this is correct?.

I can hold my hand in the sink long enough.

No comment yet fart on the sound until I connect to my main audio system.

No hum, no noise or hiss. Absolutely quiet.

Some pictures!

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

ImageShack® - Online Photo and Video Hosting
Click the image to open in full size.


Click the image to open in full size.



Click the image to open in full size.


Click the image to open in full size.



Click the image to open in full size.


Click the image to open in full size.


Click the image to open in full size.


Click the image to open in full size.

Br

AL
  Reply With Quote
Old 6th June 2011, 11:10 AM   #128
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Fugly!

__________________
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 6th June 2011, 11:11 AM   #129
diyAudio Member
 
Join Date: Aug 2008
I concur!
  Reply With Quote
Old 6th June 2011, 11:36 AM   #130
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by albertob View Post
I can hold my hand in the sink long enough.
With such sizes per monoblock, 30x30x15cm plus feet, you must be residing in Andalucia.
__________________
The buck stops Here
  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
F5 Amps - Building a Quartet of Amps in search of the Ultimate F5 NYCOne Pass Labs 123 29th September 2011 12:04 AM
Idiot´s guide to building Pass amps? judge Pass Labs 3 19th December 2004 11:33 PM


New To Site? Need Help?

All times are GMT. The time now is 05:17 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