Single or dual bridge and why?

[ßart West-VL.]

Thank you for the clear explanation, Andrew.

The simulation showed a big ripple indeed and this has to be reduced with more capacity, so it's solving one problem and creating another on the way.

Is it true that a single bridge PSU sags less then dual bridge PSU's?
I heard that this was important for bass amplifiers.
In the simulation the ripple is also less with a single bridge (if I did it right ) Total capacity the same, meaning using the 4 capacitors in dual bridge and then simulating with the same 4 on the single bridge and double the voltage, same current.

I need some software now, any suggestions?

[PixelPlay]

Hey Guys
I am in the process of building 2 aleph monoblocks with a 2kva 35-0-35 (3 leads out of the torroid) in each. If I understand from an earlier post that if the transformer has only the above configuration and not 2 separate 35v taps then I would be unable to use dual bridges?
Is there a possibility of using 2 and how would they be configured?

Your time and help is greatly appreciated.
Cheers

Greg

[ßart West-VL.]

And why would you want two bridges instead of one?

[PixelPlay]

Hey,
Well firstly I would like to know if it is possible otherwise there is no choice to make. Secondly Nelson Pass is using 2 in his newer designs and I thought that I would like to stay up to date with technology and PSU developments. I must admit it is rather confusing.

Thanks for your time

Greg

[AndrewT]

a dual secondary can use either a dual bridge rectifier or a single bridge rectifier.
A centre tapped transformer can only use a single bridge rectifier arrangement.

But this does not prevent using paralleled bridges to feed separate PSUs.

There is no advantage in using dual rectifiers for quality of output DC.
But, there may be an advantage when powering two or more amplifiers from the same PSU. Some claim it removes the hum problem.

Is it true that a single bridge PSU sags less then dual bridge PSU's?

no.

[pooge]

Originally posted by AndrewT

There is no advantage in using dual rectifiers for quality of output DC.
But, there may be an advantage when powering two or more amplifiers from the same PSU. Some claim it removes the hum problem. no.

There is an advantage to using dual rectifiers. It is in the flux distribution of the transformer. Don't know why it would make a difference in the hum level for two or more amps, though.

http://www.diyaudio.com/forums/showt...45#post1067745

[AndrewT]

Originally posted by pooge
using dual rectifiers. It is in the flux distribution of the transformer.

could you explain that?

[pooge]

see link in my edited post.

Also, see:

http://www.diyaudio.com/forums/showt...874#post143874

[Archwn]

hi everyone,

I built chip amp w/ center tapped transformer. It has no hum at all. I have a separate power supply board and the amp board connected with 3 wires/ channel i.e. +,-,gnd. is this the good way of wiring it as per mikelm / megajocke said? or how should I adjust it?

and if it is a dual secondaries setup, there will be 4 wires/ channel to the amp board is this the proper way?

or should I combine ps board and the amp board? any benifit?

one last question, if I go for 4 single secondary transformers, would there be any benifits compared with one transformers with 4 secondaries.

Thank you.