Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

When to use softstart
When to use softstart
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 26th November 2007, 11:53 PM   #1
lordvader is offline lordvader  Australia
diyAudio Member
 
Join Date: Mar 2002
Location: n/a
Default When to use softstart

Hey all.

I'm planning on building an F3 power amp, and am considering going dual mono (why not !!!).

Anyways, I know that when your transformer requirements are beyond 300VA, a softstart is recommended, but is that per transformer, or overall ?

I'm considering 2 250VA transformers (with 66000uF after each of them). In this scenario, since the inrush current is split over two transformers, I'm not sure if the softstart is required.
  Reply With Quote
Old 26th November 2007, 11:57 PM   #2
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
When to use softstart
Default Re: When to use softstart

Quote:
Originally posted by lordvader
Hey all.

I'm planning on building an F3 power amp, and am considering going dual mono (why not !!!).

Anyways, I know that when your transformer requirements are beyond 300VA, a softstart is recommended, but is that per transformer, or overall ?

I'm considering 2 250VA transformers (with 66000uF after each of them). In this scenario, since the inrush current is split over two transformers, I'm not sure if the softstart is required.

it's not just VA rating of xformer , but also No. of kilouF you have after ;

in any case - use CL60 as Papa does and enjoy
__________________
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 27th November 2007, 12:23 AM   #3
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Default Re: Re: When to use softstart

Quote:
Originally posted by Zen Mod



it's not just VA rating of xformer , but also No. of kilouF you have after ;


True, but the limit is somewhat more than 500VA and 66.000uF.

I start up my 1000VA and 200.000uF PSU's without softstart, with no problems.


Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 27th November 2007, 12:40 AM   #4
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
When to use softstart
Default Re: Re: Re: When to use softstart

Quote:
Originally posted by Magura



True, but the limit is somewhat more than 500VA and 66.000uF.

I start up my 1000VA and 200.000uF PSU's without softstart, with no problems.


Magura

from which line ?

what circuit brakers/fuses you have on that line .......... ?

__________________
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 27th November 2007, 01:25 AM   #5
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Default Re: Re: Re: Re: When to use softstart

Quote:
Originally posted by Zen Mod



from which line ?

what circuit brakers/fuses you have on that line .......... ?

230V 13A


Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 27th November 2007, 01:33 AM   #6
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
When to use softstart
Default Re: Re: Re: Re: Re: When to use softstart

Quote:
Originally posted by Magura


230V 13A


Magura

fast ( automatic) ones or slow ( ceramic, melting) ones?
__________________
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 27th November 2007, 01:43 AM   #7
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Default Re: Re: Re: Re: Re: Re: When to use softstart

Quote:
Originally posted by Zen Mod



fast ( automatic) ones or slow ( ceramic, melting) ones?

Slow blow 13A ceramic fuses.


Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 27th November 2007, 01:45 AM   #8
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
When to use softstart
Default Re: Re: Re: Re: Re: Re: Re: When to use softstart

Quote:
Originally posted by Magura



Slow blow 13A ceramic fuses.


Magura

and what's fuse in front of that sissy donut?
__________________
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 27th November 2007, 01:47 AM   #9
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Default Re: Re: Re: Re: Re: Re: Re: Re: When to use softstart

Quote:
Originally posted by Zen Mod



and what's fuse in front of that sissy donut?

10A slow blow.


Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 27th November 2007, 01:49 AM   #10
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
When to use softstart
Default Re: Re: Re: Re: Re: Re: Re: Re: Re: When to use softstart

Quote:
Originally posted by Magura



10A slow blow.


Magura




that's why you don't need soft start .......

you can also put there smith nail instead

__________________
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


When to use softstartHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for a softstart kit... rtate Solid State 7 28th February 2008 04:09 AM
Softstart for Zv9? sts9fan Pass Labs 7 8th November 2006 02:33 PM
Yet another softstart PCB harryeng Pass Labs 5 24th January 2006 09:25 PM


New To Site? Need Help?

All times are GMT. The time now is 11:38 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki