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raffir 17th June 2003 03:03 AM

The Fuses Just Keep Blowing
 
2 Attachment(s)
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]

carlosfm 17th June 2003 09:51 AM

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.

peranders 17th June 2003 10:01 AM

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.

Nuuk 17th June 2003 10:08 AM

Quote:

How must I hook them all up to have the power supply work and be Gainclone-worthy?
Please see HERE

GringoAudio 17th June 2003 04:21 PM

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.

carlosfm 17th June 2003 04:33 PM

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?

JOE DIRT® 17th June 2003 04:40 PM

your rectifiers are not wired properly...you have a dead short right now on the secondaries


DIRT®

carlosfm 17th June 2003 04:47 PM

Quote:

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...:dodgy:

Kermit 17th June 2003 06:13 PM

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?

JOE DIRT® 17th June 2003 06:31 PM

maybe I`m not reading his schematic properly but his + and - on the bridges are connected:scratch:


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