I have +-50volt rails @ 1000VA, 37600uF per rail: what would you reccomend? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 October 2004, 05:20 AM   #1
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
Default I have +-50volt rails @ 1000VA, 37600uF per rail: what would you reccomend?

as the title says.... looking for a schematic, mosfet or transistor (probably transistor, as the rails are kinda low) looking to make full use of the transformers.... maybe 4 channels?? THANX!

hehe, yes, I'm back
  Reply With Quote
Old 9th October 2004, 05:24 AM   #2
Luke is offline Luke  New Zealand
diyAudio Member
 
Join Date: Sep 2001
Location: Wellington NZ
Send a message via AIM to Luke
a leech amp maybe?
  Reply With Quote
Old 9th October 2004, 05:33 AM   #3
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
I probably should have mentioned I'm kinda limited for space..... also, I'm thinking about making it +-63 volt rails (adding an extra torodial) as I know 50 is really too low.....

what about one of the 400watt aussie amps off +-63 volt rails, rather than 70??
  Reply With Quote
Old 9th October 2004, 06:20 AM   #4
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
I'm begining to think this project isn't even worth it.... although I did just order more transformers, and today went and bought a (hopefully) suitable case for it....

I've spent $155 so far... that includes a rack mount case, 1250VA of toroidals, and 75,200uF of caps.... but the toroidals are so big that I'm not really left with enough room for the heatsinking... I don't want to have a seperate PSU to the power amp either.

finding suitable heatsinks will be a pita.... and output devices for the amp will set me back another $150 or so.... so far, everything has been cheap.... maybe someone has some surplus mosfets or transistors I could buy??? LATER!!!!
  Reply With Quote
Old 9th October 2004, 09:35 AM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
your 50v rails do not seem too low.
I ran 625va toroid 4% regulation 35vac into 2 Crimson 1704 boards. I got 110w into 8r both channels driven and 200w into 4r one channel driven. and the output stage only has one pair of 2n3773. Crimson has put in good protection that you never hear & I have never damaged them in 20 years & over 3 generations of boards.
Caps started as 2x4,700uF per rail per board.
Later amps run 3x 6,800uF per rail per board, bass strength and depth much improved. Bypass was mix of polycarbonate & polystyrene. input cap changed to 2x33uf solid tant back to back bypassed with 1uf polysomething, I,m getting too old in the grey matter.
regards Andrew T.
  Reply With Quote
Old 9th October 2004, 09:55 AM   #6
joensd is offline joensd  Germany
diyAudio Member
 
Join Date: Dec 2001
Location: Germany
The Crescendo ME would fit nicely.
I built it myself and its a nice amplifier.
If you need the layout drop me a mail.
I believe the schematics are here in the forums.
__________________
jens
  Reply With Quote
Old 9th October 2004, 01:23 PM   #7
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
Quote:
Originally posted by AndrewT
Hi,
your 50v rails do not seem too low.
I ran 625va toroid 4% regulation 35vac into 2 Crimson 1704 boards. I got 110w into 8r both channels driven and 200w into 4r one channel driven.

see, I feel that having 1000va of transformers for 220watts of output is a TAD over rated
  Reply With Quote
Old 9th October 2004, 03:44 PM   #8
diyAudio Member
 
Join Date: May 2002
Location: Cambridge, MA, USA
Send a message via AIM to Kilentra
How about a bridged circuit?
  Reply With Quote
Old 9th October 2004, 07:29 PM   #9
alvaius is offline alvaius  Canada
diyAudio Member
 
Join Date: Feb 2002
Location: Toronto
Welding! ... sorry, could not resist.
  Reply With Quote
Old 10th October 2004, 06:04 AM   #10
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
Quote:
Originally posted by Kilentra
How about a bridged circuit?

I have considered that, but would really like the ability to be able to bridge the whole amp into a single channel (if I ever need to in the future)


Quote:
Originally posted by alvaius
Welding! ... sorry, could not resist.

huh? what do you mean? make a welder??? I already have one... lol
  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
Filter Cap Directly from Rail to Rail, excluding Center Tap Workhorse Power Supplies 8 29th August 2007 12:33 PM


New To Site? Need Help?

All times are GMT. The time now is 06:17 AM.


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