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26th November 2007, 10:53 PM
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#1 |
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diyAudio Member
Join Date: Mar 2002
Location: n/a
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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. |
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26th November 2007, 10:57 PM
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#2 | |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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Re: When to use softstart
Quote:
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 ! tnx to  clean  thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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26th November 2007, 11:23 PM
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#3 | |
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diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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Re: Re: When to use softstart
Quote:
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 |
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26th November 2007, 11:40 PM
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#4 | |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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Re: Re: Re: When to use softstart
Quote:
from which line ? what circuit brakers/fuses you have on that line .......... ? 
__________________
my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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27th November 2007, 12:25 AM
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#5 | |
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diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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Re: Re: Re: Re: When to use softstart
Quote:
Magura
__________________
Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com |
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27th November 2007, 12:33 AM
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#6 | |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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Re: Re: Re: Re: Re: When to use softstart
Quote:
fast ( automatic) ones or slow ( ceramic, melting) ones?
__________________
my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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27th November 2007, 12:43 AM
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#7 | |
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diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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Re: Re: Re: Re: Re: Re: When to use softstart
Quote:
Slow blow 13A ceramic fuses. Magura
__________________
Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com |
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27th November 2007, 12:45 AM
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#8 | |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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Re: Re: Re: Re: Re: Re: Re: When to use softstart
Quote:
and what's fuse in front of that sissy donut?
__________________
my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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27th November 2007, 12:47 AM
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#9 | |
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diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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Re: Re: Re: Re: Re: Re: Re: Re: When to use softstart
Quote:
10A slow blow. Magura
__________________
Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com |
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27th November 2007, 12:49 AM
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#10 | |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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Re: Re: Re: Re: Re: Re: Re: Re: Re: When to use softstart
Quote:
 that's why you don't need soft start ....... you can also put there smith nail instead
__________________
my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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