Quad 405 Dual Mono PSU - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 10th July 2009, 07:58 PM   #1
Bilko is offline Bilko  United Kingdom
diyAudio Member
 
Join Date: Jul 2009
Default Quad 405 Dual Mono PSU

Hi everyone, great forum with tons of very useful stuff. I've lurked here for a while and finally jumped in!

I'm a relative noob to the Audio world but have dabbled in electronics for a while. I've acquired a Quad 405-1 and a 44 which I'm hoping to sort out and use as my main system. They've not been used for years and having read up on all the mods I've decided to start with the PSU.

I'm going to use a dual mono arrangement and have decided (to save my limited cash) to build my own. Having looked carefully at all the ones available from the likes of DADA and NetAudio I've designed my own circuit board and acquired 4 off 10,000uF 63V BHC Slit Foil Caps, two 8A 400V SIL Bridge Rectifiers and 4 off 100nf caps to bridge each of the main filter caps. I believe these are used for suppresion of spikes and transients?

I've noticed that these smaller caps are fitted to some DMPS boards but not others.

Are they needed and is the value of 100nf about right? (The ones I have are X2 rated 275v ones)

Also the original Bridge was rated at 35A and 400v, Will my dual 8A 400V bridges handle the power-on surge etc.?

(I'm retaining the 405 mains transformer and I'm also fitting 470nf caps across the AC out from the secondary of the transformer to the Center Taps).

I was just going to press on with this but there's so much experience and knowledge on this forum I thought it wise to ask for advice.

Thanks!

Bilko
  Reply With Quote
Old 10th July 2009, 10:27 PM   #2
Bilko is offline Bilko  United Kingdom
diyAudio Member
 
Join Date: Jul 2009
Just put this circuit together to show what I'm driving at,

Hope it helps.

Any comments and suggestions very welcome.

Thanks
  Reply With Quote
Old 10th July 2009, 10:27 PM   #3
Bilko is offline Bilko  United Kingdom
diyAudio Member
 
Join Date: Jul 2009
Sorry Mods, File size was too big for the attachment

Second attampt ...

Just put this circuit together to show what I'm driving at,

Hope it helps.

Any comments and suggestions very welcome.

Thanks
  Reply With Quote
Old 9th November 2009, 10:59 AM   #4
Tyron is offline Tyron  United Kingdom
diyAudio Member
 
Join Date: Aug 2006
Hi Bilko,

I wonder if you completed your PSU mod and how you got on? Have you done any other mods? I have a 405-2 and am considering doing similar.

Regards,

Tyron
  Reply With Quote
Old 9th November 2009, 11:26 AM   #5
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
some useful pics

Quad 405 for beatgoeson - DIY Audio Forum

use google translator , if needed - from Serbian to English
__________________
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 10th November 2009, 02:29 AM   #6
eyoung is offline eyoung  United States
diyAudio Member
 
eyoung's Avatar
 
Join Date: Aug 2007
Location: Sunny SC,USA 15 min south of Charlotte NC
Hola, ZEN Maestro,

[#10171] You do not have permission to view this attachment.

I had trouble viewing your attachment...

Regards, Elwood
__________________
"Lead me not into temptation...I can find it myself."
  Reply With Quote
Old 10th November 2009, 08:40 AM   #7
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
sorry - I forgot that ; you must be logged to see them
I'll try to transfer these pics here today
__________________
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 15th November 2009, 03:41 PM   #8
Bilko is offline Bilko  United Kingdom
diyAudio Member
 
Join Date: Jul 2009
Quote:
Originally Posted by Tyron View Post
Hi Bilko,

I wonder if you completed your PSU mod and how you got on? Have you done any other mods? I have a 405-2 and am considering doing similar.

Regards,

Tyron
Hi Tyron,

It's been a while since I finished this project but I'm pleased to report a real success! The 405 is currently in use and I love it!

I made up a Dual Mono PSU circuit board and built the power supply using four BHC 10,000uf caps and modded the boards with most of the mods from mssrs. Ludwig and Snook. I'm over the moon with the results, the finished amp is far better than I had hoped for!

I've attached some pics.

Regards
Colin
Attached Images
File Type: jpg Modified 405 board.JPG (171.6 KB, 243 views)
File Type: jpg 405 Finished.JPG (188.6 KB, 226 views)
File Type: jpg 405 Finished 1.JPG (177.2 KB, 218 views)
File Type: jpg P8080013222.JPG (158.7 KB, 220 views)
  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
QUAD 909 Mono, voltage converting. KOL69 Solid State 1 15th March 2009 03:54 PM
making dual mono jack from single mono jack dubmunkey Analog Line Level 2 12th October 2006 02:16 PM
Why dual mono? preiter Chip Amps 11 21st September 2006 09:37 PM
Single Mono's or Dual Mono? Tazzy Pass Labs 8 3rd October 2002 02:03 PM
Dual Mono - Anti Mono Power Supplies pmkap Everything Else 3 16th February 2002 05:10 AM


New To Site? Need Help?

All times are GMT. The time now is 08:38 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