help with Powersupply

iceman · 6th June 2003, 10:16 AM

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 !!

raindog · 6th June 2003, 12:04 PM

try this, it will give you +/- 50V

iceman · 6th June 2003, 12:59 PM

Your schema looks okey, but i cant find the zero(0) on each transformer?

iceman · 6th June 2003, 03:36 PM

Sorry, now I seen it.
If I understand this right, then I should not use the 0 from the transformers!?

HighTec · 6th June 2003, 05:48 PM

Hi.

Iceman...I'm little bit confused here.If I understood you well,you have a transformer with two separate secondary coils.If it is,wire them like shown bellow.But here is a suggestion.Order a transformer with 72V on secondary.Of course with a center tap.This will give you 2x50VDC.Make your life easy!

By the way(just in case)tell me the core ratings of your transformers.If you are not sure, write down the transformer dimensions.
Regards.

iceman · 7th June 2003, 09:49 AM

HighTec

This is how my transformers look:

HighTec · 7th June 2003, 12:24 PM

Hi.

Aha...ok!Use the S1 / S2 and leave center tap unwired.This will give you 36V.
You didn't mention transformers core ratings?
Regards.

natten · 7th June 2003, 01:08 PM

HighTec

If you connect it like the b) example and then rectifie it which voltages will you get? and will you get a GND

HighTec · 7th June 2003, 01:20 PM

Hi.

That's why I suggested Iceman to order a new transformer.
There is no way to get +/- 50VDC from a transformer he has.
I'm also sceptic about his transformer ratings!
About fig.(b) he will get 50VDC but without the common ground.
Cheers.

natten · 7th June 2003, 01:47 PM

So you will get +/- Xv with example b. Can i use the ACground to ground it or can i make it in another way if i dont have a ground on the ac outlet

6th June 2003, 10:16 AM	#1
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	help with Powersupply 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 !!

6th June 2003, 12:59 PM	#3
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	question again Your schema looks okey, but i cant find the zero(0) on each transformer?

6th June 2003, 03:36 PM	#4
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	Help with Powersuply Sorry, now I seen it. If I understand this right, then I should not use the 0 from the transformers!?

7th June 2003, 01:08 PM	#8
natten diyAudio Member Join Date: Feb 2003 Location: sweden	Re: ??? HighTec If you connect it like the b) example and then rectifie it which voltages will you get? and will you get a GND

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7th June 2003, 01:20 PM	#9
HighTec diyAudio Member Join Date: Mar 2003 Location: Sibenik, Croatia	Hi. That's why I suggested Iceman to order a new transformer. There is no way to get +/- 50VDC from a transformer he has. I'm also sceptic about his transformer ratings! About fig.(b) he will get 50VDC but without the common ground. Cheers.

7th June 2003, 01:47 PM	#10
natten diyAudio Member Join Date: Feb 2003 Location: sweden	So you will get +/- Xv with example b. Can i use the ACground to ground it or can i make it in another way if i dont have a ground on the ac outlet

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