The Fuses Just Keep Blowing

raffir · 17th June 2003, 03:03 AM

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

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...

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

17th June 2003, 10:01 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me

17th June 2003, 04:21 PM	#5
GringoAudio diyAudio Member Join Date: Oct 2007	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.

17th June 2003, 06:13 PM	#9
Kermit diyAudio Member Join Date: Jun 2002 Location: Oslo - Norway	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? __________________ Sven Sødem

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17th June 2003, 09:51 AM	#2
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	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.

17th June 2003, 04:33 PM	#6
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	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?

17th June 2003, 04:40 PM	#7
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	your rectifiers are not wired properly...you have a dead short right now on the secondaries DIRT®

17th June 2003, 06:31 PM	#10
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	maybe I`m not reading his schematic properly but his + and - on the bridges are connected

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