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 !!
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 !!
Help with Powersuply
Sorry, now I seen it.
If I understand this right, then I should not use the 0 from the transformers!?
Sorry, now I seen it.
If I understand this right, then I should not use the 0 from the transformers!?
???
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.
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.
Attachments
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
HighTec
If you connect it like the b) example and then rectifie it which voltages will you get? and will you get a GND
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.
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.
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
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.
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.
Attachments
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
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
Attachments
HighTec said:
Hi,
iceman have two trafos with 2x18V. This is overall 2x36 AC, and hi can build PS with 2x45-50V DC.
Regards
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 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?
HighTec said:
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.
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
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
Hi.
Yes,that's right.But if it still doesn't work,you must check the components.Start with transformers.
Regards friend.🙂
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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