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Old 17th June 2003, 03:03 AM   #1
raffir is offline raffir  Canada
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Default The Fuses Just Keep Blowing

I've been trying to construct a power supply for my Gainclone. Every time I plug it in, it blows a fuse. Right now, the schematic is as follows.
T1 is a Plitron 225 VA transformer with 15v secondaries.
F1 and F2 are slow-blow 4A fuses.
BR1 and BR2 are 50V fast rectifiers, I think.
How must I hook them all up to have the power supply work and be Gainclone-worthy?[IMG]ps1.jpg[/IMG]
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Old 17th June 2003, 09:51 AM   #2
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raffir,
You just need one fuse one one of the wires of the transformer's primary.
On the other wire you can put a 10ohm/7w resistor, because toroids have a big in-rush current at turn on, and that's what may be blowing your fuses.
Then you can use a 2A fuse, because 4A is too much.
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Old 17th June 2003, 10:01 AM   #3
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4 A slow should work but I sucpect that you have connected the primary wrong. Do you have any 12 or 24 VAC? If yes, use this voltage as test voltage.

You could have connected the primary windings so they cancel out the magnetic field = short circuit more or less.
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Old 17th June 2003, 10:08 AM   #4
Nuuk is offline Nuuk  United Kingdom
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Quote:
How must I hook them all up to have the power supply work and be Gainclone-worthy?
Please see HERE
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Old 17th June 2003, 04:21 PM   #5
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Unhappy Yeah look at the Primary connections again(nt)

The connections to the primary circuits of your transformer might be the problem as your power supply concept is fine.
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Old 17th June 2003, 04:33 PM   #6
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Looking again at your schematic...
Is it 4 wires you have on the primary?
Aren't you connecting 115v and 230v primaries at the same time?
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Old 17th June 2003, 04:40 PM   #7
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your rectifiers are not wired properly...you have a dead short right now on the secondaries


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Old 17th June 2003, 04:47 PM   #8
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Originally posted by JOE DIRT®
your rectifiers are not wired properly...you have a dead short right now on the secondaries


DIRT®

Where, where??!
It's too dense around here...
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Old 17th June 2003, 06:13 PM   #9
Kermit is offline Kermit  Norway
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Your bridges look fine to me, that’s the way I did it in my Aleph.
Are you sure your primary side is wired correctly? Referring to plitron’s website (http://www.plitron.com/pages/Products/Std/schemati.htm) for 115v operation the black and brown wires should be joined and connected to neutral, and the white and orange connected to hot.
Do you have anything connected when the fuse blow?
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Old 17th June 2003, 06:31 PM   #10
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maybe I`m not reading his schematic properly but his + and - on the bridges are connected
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