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Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
My sstc (Steve Ward Mini-style) has been unable to work off my variac because it constantly blows the fuse.
Everything about the coil looks fine, all waveforms are normal, new GDT, hell it even runs off a 12V lead-acid powering the bridge (w/ 2.5A draw)!
But when I plug it in to the variac (8A fuse), and slowly dial it up, once it passes about 10V, *pop*, and the fuse is blown. Ive been thru a pack of these trying to fix it, to no avail. Now I have 5 more; hoping for some suggestions. (BTW, the variac works fine with other loads; drill, lamp, etc.)
I'm not that pissed tho, because usually when I see a blown fuse the first thing I think is, "FETs must be dead", since they usually just fail short and blow the fuse that way. This time, the fuse blows and FETs survive.
I have a home made current probe that is showing me a clean 5Apk sine wave on the primary, however primary voltage seems to ring up to 4x the rail.
Has anyone else had this problem before? Because I sure don't want to plug it into the mains in this condition.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Hmm... that would cause problems for AC but not DC...makes sense... I'll check right now.
EDIT: Steve, you are both a gentleman and a scholar. It was the rectifier. It was shorted, but instead of just shorting the AC, it was shorted in two halves, so that it was feeding my bridge AC. Luckily I didn't have my filter cap explode or something...anyway thanks its working again.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Been there, Done that...
I usually just use these monster 25A bridges now for everything since i got 100 of them on ebay for 10 bucks... its pretty hard to blow them up so its been a problem of the past.
Registered Member #973
Joined: Tue Aug 28 2007, 07:32PM
Location: Pittsburgh, PA
Posts: 66
that's funny you had this problem, because it happened to me a few days ago. the litle rectifier i had kept shorting on me and my fuse always died. i need to find a good rectifier that can handle the power.
100 for 10??? lucky you. i've found a few on ebay, but not close to that price
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