Help for the Crescendo ME!! - 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 7th June 2005, 11:27 AM   #1
FeFe is offline FeFe  Sweden
diyAudio Member
 
Join Date: Apr 2005
Location: Furulund
Question Help for the Crescendo ME!!

Hi, I'm a newbeginner on this so be patient

I'm building a Crescendo ME (no mods) and don't know how to do with the four (one pair/channel) BIG capasitors (don't know the word in english) in the PSU. They're at 22000uF each.

Is it possible to have them all connected, or should I do as Elektor did (see picture)?

Best Regards

Fredrik
Attached Images
File Type: jpg crescendo me.jpg (14.9 KB, 465 views)
__________________
Soon to be a major religion
  Reply With Quote
Old 8th June 2005, 03:10 PM   #2
FeFe is offline FeFe  Sweden
diyAudio Member
 
Join Date: Apr 2005
Location: Furulund
Anyone? I can't build it 'till I know.
__________________
Soon to be a major religion
  Reply With Quote
Old 8th June 2005, 03:12 PM   #3
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Frederic, I'll gladly try to answer but I don't understand what you try to ask.

/Hugo
  Reply With Quote
Old 8th June 2005, 03:22 PM   #4
diyAudio Member
 
JC Fardo's Avatar
 
Join Date: Jun 2002
Location: Sao Paulo - Brazil
Hello FeFe

Crescendo is a dual-mono amp, then provides benefits of separate circuits and PSU as well. Build them as per instructions and youŽll be fine. Capacitor is correct.

Regards,

JC
  Reply With Quote
Old 11th June 2005, 07:10 PM   #5
FeFe is offline FeFe  Sweden
diyAudio Member
 
Join Date: Apr 2005
Location: Furulund
Sorry for the delay.

JC Fardo
Thanks alot, I'm new at this DIY-thing, and I ain't any good at this (yet ). I have another question now though, I understand your answer but still have to ask:

Won't the amplifier work at all if I use a "bridge" between all four PSU capacitors? What will happen?

Netlist
I'm sorry if I don't express myself in a easy way, but as I said to JC Fardo; I'm new to this (very very new) so bare with me please.

Best Regards

Fredrik
__________________
Soon to be a major religion
  Reply With Quote
Old 11th June 2005, 07:18 PM   #6
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
No problem Frederic, I hope you found the answers to your question.

/Hugo
  Reply With Quote
Old 11th June 2005, 08:15 PM   #7
diyAudio Member
 
JC Fardo's Avatar
 
Join Date: Jun 2002
Location: Sao Paulo - Brazil
Hello FeFe

You must also consider the trafos and rectifier brigdes upstream to the caps. If you are planning to use one trafo for two channels you better double its rated power to 450 VA and the retictifier bridge to 70A at least.

From the + and - poles of the capacitors array take two wires to feed each main boards.

And youŽll use only one soft start circuit OK?, so you must double amps of rectifer bridge B1 too.

IŽm just curious why do you want to "bridge" the caps.

Again hope this helps,

JC
  Reply With Quote
Old 12th June 2005, 05:54 PM   #8
FeFe is offline FeFe  Sweden
diyAudio Member
 
Join Date: Apr 2005
Location: Furulund
JC Fardo
I'm building it with two trafos (separete psu's). I think I want that bridge beacuse I want a common zero-point for all the parts in the amp, doesn't that make sense? Wouldn't the power be more "stabilsed" or something?

My Uncle built his Crescendo (-84 model) with the four caps connected, but I don't know why he built it that way, and his was working allright (i think, haven't heard it, just seen).

Another reason to why I want it that way is that I have made a piece of copper to bridge them, and then I looked in the papers and saw that they weren't connected.

What pros and cons is there in building it like that? (Any dangers? )

This is my first amp, so I wan't it to become reasonable good, it's a pretty expensive amp to build. At least it is for me.

I will post some pictures of it as soon as I can


Best Regards

Fredrik
__________________
Soon to be a major religion
  Reply With Quote
Old 12th June 2005, 06:16 PM   #9
joensd is offline joensd  Germany
diyAudio Member
 
Join Date: Dec 2001
Location: Germany
Hi,
IŽm using a 25A bridge-rectifier, 2*33000uF caps and a 650VA transformer to feed 2 channels.
No problems, concerns, whatsoever.

greets&happy listening
__________________
jens
  Reply With Quote
Old 12th June 2005, 06:28 PM   #10
diyAudio Member
 
megajocke's Avatar
 
Join Date: Jan 2003
The reason they aren't connected is that it is like two separate amps in the same case (dual-mono). It helps preventing ground loops among other things.
  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
crescendo amp neeraj Solid State 10 22nd April 2012 12:13 PM
Seas Crescendo Jonasz Swap Meet 5 12th October 2006 08:21 PM
Seas Crescendo Jonasz Multi-Way 2 1st January 2006 08:05 PM
Another crescendo ME question kro5998 Solid State 8 5th May 2005 10:44 PM


New To Site? Need Help?

All times are GMT. The time now is 10:01 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