Choosing the right transformer

[jeffreyrow]

Hi, I need some help here. I have a toroidal transformer tht has 200, 220, 260, 280 and 320 volt outputs. I need a 400-0-400 supply from here. How do I do this. Btw my primary is 230 volts. Can someone pls help me. Thanks

 

[costis_n]

Hi, I need some help here. I have a toroidal transformer tht has 200, 220, 260, 280 and 320 volt outputs. I need a 400-0-400 supply from here. How do I do this. Btw my primary is 230 volts. Can someone pls help me. Thanks

Hi

I assume the schematic you have shows a 400-0-400 transformer. In that case, you don't have to follow it blindly, just use a solid state bridge and the 280 volt winding.

 

[kevinkr]

I split this off from another thread as this question was OT there. Please start a new thread rather than diverting the direction of another one. Thanks...

 

[razorrick1293]

for a 400-0-400 v supply, you are basically looking at 0-800, the most your traansformer can supply is 0-320. Im assuming you dont need a dual rail supply at +/-500v so you can use the 200 or 220 volt output and use a voltage doubling rectifier instead of a full wave/bridge rectifier.

 

[AndrewT]

Values/tubes on a dual polarity supply !
We usually only see a small -ve supply to bias the stages.
The values all behave as Nchannel only, there are no complements.

 

[boywonder]

Hi, I need some help here. I have a toroidal transformer tht has 200, 220, 260, 280 and 320 volt outputs. I need a 400-0-400 supply from here. How do I do this. Btw my primary is 230 volts. Can someone pls help me. Thanks

Jeffrey: Do you just need a +400VDC B+? ie, no -400VDC? Is this for a tube amp?

 

[tinitus]

is this for a tube amp ? boy, are trying to be funny ?

but there are indeed quite many tube amp power supply trafos built/sold with symmetric voltages, and CT point
not that I know why exactly either

 

[AndrewT]

Centre tapped output transformer.
But both ends are connected to B+, not to B- & B+

 

[Pano]

Right. What do you need for B+?

 

[kevinkr]

I'm wondering if he was in fact looking for 800VCT AKA 400-0-400 in which case this transformer will not get him there, if OTOH he is looking for something close to the sort of output one could expect from 800VCT with a tube rectifier then the 320V tap with a solid state bridge rectifier might get him reasonably close. (or not)

 

[AndrewT]

I think the opener does not know what he needs.
I think if that is the case he/she should not be dabbling in 400Vdc supplies and probably not getting anywhere near mains supplies !!!!!

 

[tinitus]

the first 2posts

jeffrey, are you there ?
time to see your schematic

I have a toroidal transformer tht has 200, 220, 260, 280 and 320 volt outputs.

I need a 400-0-400 supply from here. How do I do this.

I assume the schematic you have shows a 400-0-400 transformer.

In that case, you don't have to follow it blindly, just use a solid state bridge and the 280 volt winding.

 

[jeffreyrow]

Hi Guys, sorry i did not reply. My close fren had a stroke n a heart attack and was hard pressed with hospital visit n taking care of him. He is well and I have finished the power supply i mentioned earlier on.

Thank you so very much for all ur comments and ideas. Thanks again guys.

 

[TonyTecson]

please tell us what you are trying to build and we can go from there....

 

[AndrewT]

J is still alive.
That's better than I was beginning to fear.