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Old 7th June 2003, 03:17 PM   #11
HighTec is offline HighTec  Croatia
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Hi.

Natten you have mixed up things.If you want to make a good power supply look the photo bellow.Forget about example b.
In this case here are some simple calculations:

50 / 1,41 = 35,5

So you will need a transformer with 2x36V on secondary.
The AC outlet ground connect to the chassis and nothing else!
You must ground the chassis for safety reasons!
Regards.
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Old 7th June 2003, 03:44 PM   #12
natten is offline natten  Sweden
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Ok

I have now a dual secondaries trafo but i dont know the ratings on it but im pretty sure it is 2x24 v
anyway, it doesnt work.

i have bulit it like it is in the attached file. dont mind the two v+. i dont now how to use all things in circuitmaker yet.

I have connected + from one bridge and - from the other to make the ground
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Old 7th June 2003, 04:08 PM   #13
moamps is offline moamps  Croatia
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Default Re: help with Powersupply

Quote:
Originally posted by iceman
Hello !!

Sorry if you think this question is stupid, but i'm a complete newbie to this.

I want to build a PSU for my amp that I build.
I got this transformers already:
2 x transformer (primary=220V, secondary=2x18V)

I want to feed my amp with +- 45-50V.
How do i do ??, Please help !!

Hi,

Look post no. 2 (raindog)
or this pic.
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Old 7th June 2003, 04:13 PM   #14
moamps is offline moamps  Croatia
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Quote:
Originally posted by HighTec
There is no way to get +/- 50VDC from a transformer he has.
Hi,

iceman have two trafos with 2x18V. This is overall 2x36 AC, and hi can build PS with 2x45-50V DC.

Regards
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Old 7th June 2003, 04:19 PM   #15
HighTec is offline HighTec  Croatia
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Ooops!
I have to put my glasses.LOL.Thanx Moamps!

Natten... so were is the problem?The schematic looks OK.How much supply voltage do you need?
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Old 7th June 2003, 04:59 PM   #16
natten is offline natten  Sweden
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Quote:
Originally posted by HighTec
Ooops!
I have to put my glasses.LOL.Thanx Moamps!

Natten... so were is the problem?The schematic looks OK.How much supply voltage do you need?

I need a voltage above 0

I have bridged two lm3886 so its not too important which voltage it is but i want it to be >20v. the amp works but the PS doesnt work at all. im going to test it some more later.
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Old 7th June 2003, 05:44 PM   #17
HighTec is offline HighTec  Croatia
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Exclamation Don't work?

Natten the bridge 2 is connected wrong!
Bellow is how it must be wired!
By the way check the transformers and other parts.
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Old 7th June 2003, 06:32 PM   #18
natten is offline natten  Sweden
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Ok

You mean that i connect - from bridge 1 and + from bridge 2 and then i get the gnd?

well, that is how i have done it, but i did miss to do that on the schematic
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Old 7th June 2003, 06:41 PM   #19
HighTec is offline HighTec  Croatia
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Hi.

Yes,that's right.But if it still doesn't work,you must check the components.Start with transformers.
Regards friend.
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Old 7th June 2003, 06:45 PM   #20
natten is offline natten  Sweden
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ok, dont have a multimeter at home so i cant do it now
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