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BIA 31st December 2012 09:53 PM

Help with transformers
 
Hi im new , i need help .

I have transformer its 240vac , the secondary winding is 0-24vac .

Do i use a Bridge rectifier to get +/- V dc or do i use two diodes ?

Im totally stumped . ;-/

bear 31st December 2012 10:20 PM

Yes.

Look up online

"Full Wave Rectifier"

and

"Bridge Rectifier"

You will not be able to get + & - from a single secondary.

There are tricks to get a "center" point, but that's not probably something you want to do. Are you sure you have ONLY a single secondary??

Two wires? Or Three? Or four?

BIA 31st December 2012 10:33 PM

Two wires , 0-21vac

BIA 31st December 2012 10:51 PM

Transformer Help
 
Hi yes i dont know what you mean by single secondary , all i know is the transformer has an output of 0-21vac , so the Alternating current is bouncing/pulsing along the ground never going negative volts .

So how do i split this into +/- dc ?

paulb 31st December 2012 11:28 PM

Elliott Sound Products - Linear Power Supply Design
I suggest that you read the entire article.

sawreyrw 31st December 2012 11:33 PM

You should use two diodes to form two half wave recifiers. Of course, you need properly sized diodes and caps.

nigelwright7557 31st December 2012 11:53 PM

Quote:

Originally Posted by bear (Post 3305988)
Yes.

You will not be able to get + & - from a single secondary.

There are tricks to get a "center" point, but that's not probably something you want to do. Are you sure you have ONLY a single secondary??

Two wires? Or Three? Or four?

You can get two rails from a single transformer using half wave rectification to get each supply.
I know the picture shows two windings but treat as one for your purpose.

http://www.ckp-railways.talktalk.net/PSU2.jpg

CharlieLaub 1st January 2013 01:08 AM

I believe that Nigel meant to show an earth ground connected to the "ZEROVOLTS" output. If this is not included, I believe that the whole PS can/will float...

-Charlie

bear 1st January 2013 02:49 AM

Get yourself another identical transformer.

Or

Get yourself a proper transformer for the job (which you did not say what it is). Imo half wave rectifier supplies are not normally a great idea...

You might say what your application is, so that folks might give you a better bit of input?

paulb 1st January 2013 03:06 AM

Quote:

Originally Posted by bear (Post 3306231)
Imo half wave rectifier supplies are not normally a great idea...

Why? Because you need twice the capacitance?


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