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?
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?
Attachments
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.
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.
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.
You could have connected the primary windings so they cancel out the magnetic field = short circuit more or less.
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.
The connections to the primary circuits of your transformer might be the problem as your power supply concept is fine.
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?
Is it 4 wires you have on the primary?
Aren't you connecting 115v and 230v primaries at the same time?
your rectifiers are not wired properly...you have a dead short right now on the secondaries
DIRT®
DIRT®
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?
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® said:maybe I`m not reading his schematic properly but his + and - on the bridges are connected
That's OK, that's the ground...😉
mike
It is correct! But I would suggest that you only connect ONE primary winding (is it 120 V?) and test. And do the same thing with other one. If you get correct voltage bot times, you have for sure connected the primary windings wrong. In that case, just flip one winding. It's safe to connect only one winding as long as you have less than half the rated load but I suppose you have only smoothing caps as load?JOE DIRT® said:
What I'm going to do
I'm going to try testing it with only one bridge rectifier and pair of secondaries hooked up (I'll use the other two as 0v) as suggested on the Decibel Dungeon. I've had success before, the only problem was that the music would play for a moment only to be replaced by a buzzing sound, or sometimes nothing at all. Incidentally, the "Gainclone" I've been using is K50 as shown at http://www.kitsrus.com/pdf/k50.pdf
I'm going to try testing it with only one bridge rectifier and pair of secondaries hooked up (I'll use the other two as 0v) as suggested on the Decibel Dungeon. I've had success before, the only problem was that the music would play for a moment only to be replaced by a buzzing sound, or sometimes nothing at all. Incidentally, the "Gainclone" I've been using is K50 as shown at http://www.kitsrus.com/pdf/k50.pdf
Ground
Hooking up 115-0 to make a centre tap as shown on Decibel Dungeon, I was assaulted by a flash and crack. The fuses look alright, which worries me. Anyway, can I avoid making a fake centre tap by simply connected ground on the amp to the green plug/3d pin on the AC cord?
Hooking up 115-0 to make a centre tap as shown on Decibel Dungeon, I was assaulted by a flash and crack. The fuses look alright, which worries me. Anyway, can I avoid making a fake centre tap by simply connected ground on the amp to the green plug/3d pin on the AC cord?
What's the X?
I'm going to try it with one BR first. Now I just have to figure out how to wire everything to ground.
This is hard work, a lot harder than assembling the amp; there's the constant risk of death, the safety precautions, and the many, many fuses.
I'm going to try it with one BR first. Now I just have to figure out how to wire everything to ground.
This is hard work, a lot harder than assembling the amp; there's the constant risk of death, the safety precautions, and the many, many fuses.
When I hooked up my Aleph 30 power supply I followed the colors of the secondaries, believing that the wires with the same color belonged to the same secondary.. well I was wrong, I almost fried my bridges. So I'd check which wires belong to one secondary and which to the other...
Cheers
Andrea
Cheers
Andrea
Re: Ground
On the primary side? Do you have a link to were this is shown?
If you identify the colours on the windings on your drawing it would be easier to see what’s wrong.
raffir said:
On the primary side? Do you have a link to were this is shown?
If you identify the colours on the windings on your drawing it would be easier to see what’s wrong.
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