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6th May 2004, 03:24 AM
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#1 |
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diyAudio Member
Join Date: Jan 2003
Location: Maple Grove, MN
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Why is my gainclone eating fuses?
It goes through 2 fuses about once a week. I am not running a pot with it but I try to stop the music before I turn off the amp.
Rite now I am just letting it run all the time. |
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6th May 2004, 04:55 AM
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#2 |
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Electrons are yellow and more is better!
diyAudio Member
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You might need a soft starter or at least bigger fuses.
Inrush Current Limiting Circuit http://www.diyaudio.com/forums/showt...809#post231809 http://www.diyaudio.com/forums/showt...ht=#post365890
__________________
/Per-Anders (my first name) or P-A as my friends call me |
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6th May 2004, 11:54 AM
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#4 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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In my case, 400VA toroid, I had also blown fuses untill I started using bigger values (even 5A was not enough sometimes, and now 6A is what I use). The fuses were blowing because of high inrush current when powering toroid.
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6th May 2004, 12:12 PM
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#6 |
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diyAudio Member
Join Date: Jul 2003
Location: Huddinge, Sweden
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What's to say it's the primary fuse that blows?
We need circuit and values to diagnose properly. Rune
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Do wizards use spell checkers? |
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6th May 2004, 12:24 PM
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#7 |
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diyAudio Member
Join Date: Jan 2003
Location: Maple Grove, MN
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Ok here is what I am running.
BrainGT's PCB gainclone This is the torroid I am using http://www.partsexpress.com/pe/pshow...number=122-640 This is my power entry module http://sales.goldmine-elec.com/prodinfo.asp?prodid=9312 rite now I am running (2)2a slow blo fuses. |
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7th May 2004, 03:24 PM
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#8 |
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diyAudio Member
Join Date: Aug 2003
Location: Utrecht, NL
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try using a bigger fuse , say 2.5 or 3 ampere (slow blow). toroidal transformers cause quite an inrush current. I'm using a 2a fuse with a 225va transformer but i blow this one about once every two weeks.
You could of course use an ntc / thermistor in one of the lines powering the toroid. Sort of a very basic soft-start. |
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7th May 2004, 03:43 PM
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#9 |
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Electrons are yellow and more is better!
diyAudio Member
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When it comes to fuses there are normally recommended values from the transformer manufactures. Think about WHY you have fuses also.
I can speak for my own sake, 600 VA and 60 000 uF can't an automatic 10 A fuse take. The fuse in the amp is 4 of 5 AT (don't remember) at 230 VAC. Maybe my soft starter is the solution?
__________________
/Per-Anders (my first name) or P-A as my friends call me |
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7th May 2004, 03:59 PM
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#10 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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I guess in 120V countries inrush current are even more, so higher fuse values apply. I can't use an amp with anything less than 5A fuse (for 400VA toroid).
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