| george a |
Hi All
I am soon to commence (i hope)my Aleph 5's but am unsure as to which way to go with power supply.
i have the following bits
4 off 80000uF caps + 2 chokes
2 off Tranformers each 25-0-25 @ 50A
The dilemna, do I go single supply with total 160000uF per rail (320000Uf total) with either 1 transformer or 2 in parallel?
This would also involve use of chokes between caps( for a pi? filter??).
or
dual mon supply with i transformer per channel and 80000uF caps per rail for a total of 160000uf per amp. - no chokes though
Any comments welcome..
Thanks in advance |
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| george a |
| Or I could do this to power subs as well (plus P1.7 Preamp).... |
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| george a |
actually -correct wiring of the diodes and caps would work ebven betterer! ....doh!
I'm sure you all get the idea.. |
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| Taco |
| The production Aleph's don't use a coil in the powersupply. So I would suggest to use 1 trafo+ 160.000 uF a channel. I would not recommend to power also your preamp from the same supply, The P1.7 needs a 60 Volts (dual 30V secundair for your trannies) I don't see how you want to get this wiht transformers with 25V secundair voltage. |
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| george a |
Taco
thanks for reply
if you at posted schematic you will see wher i'll get higher voltage from, which can then be regulated for the P1.7. |
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| Taco |
| Now I see what you'r doing :P, this only works with 1 common supply but don't you get an uneven load on those trannies. Don't know of this matters. |
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| MikeW |
| It depends on how you are going to cool them. If they are built in as stereo you will not be able to lift them unless there are fans. The stereo A-30 that I built with the R-theta heatsinks is 72 pounds. It has a 20 degrees rise. The mono blocks will be more work but easier to move. |
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| george a |
Taco
Transformers each rated at 2.5kva , preamp load probably.
not an issue
I beleive alpeh 5 draw constant current and hopeffuly wont react with supply to preamp.
Subs supply (feeding Hafler dh200 clone) may be a different story though. if this proves a problem then i have a spare Hafler to use as a stand alone bass amp.
Am just trying to get the poewr for the preamp from somewhere without having to by another transformer.
Also trying to keep things a bit more compact |
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| george a |
MikeW
I am thinking of fan cooling + 2 boxes -
one for Power supply and one for power amp.
Will probably still weigh in at about 70 pounds anyway....
Transformers currently power hafler clone and I can carry it short distances only.
I will probably also need some hefty cables for linking the 2 boxes- may put half of caps in amp box...(160000uF) |
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| Taco |
| quote: | Originally posted by george a
MikeW
I am thinking of fan cooling + 2 boxes -
one for Power supply and one for power amp.
Will probably still weigh in at about 70 pounds anyway....
Transformers currently power hafler clone and I can carry it short distances only.
I will probably also need some hefty cables for linking the 2 boxes- may put half of caps in amp box...(160000uF) |
It's a good idea to put some of the filtercaps in your ampcase. And now realizing that you use 2,5kVa trannies I think it's no problem at all using 1 supply for both. |
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| roddyama |
| quote: | Originally posted by george a
Hi All
I am soon to commence (i hope)my Aleph 5's but am unsure as to which way to go with power supply.
i have the following bits
4 off 80000uF caps + 2 chokes
2 off Tranformers each 25-0-25 @ 50A
The dilemna, do I go single supply with total 160000uF per rail (320000Uf total) with either 1 transformer or 2 in parallel?
This would also involve use of chokes between caps( for a pi? filter??).
or
dual mon supply with i transformer per channel and 80000uF caps per rail for a total of 160000uf per amp. - no chokes though
Any comments welcome..
Thanks in advance |
The transformers are huge. One is 3X more then what is safe for both channels of an Aleph5. But, with what you have listed, I would suggest a single CLC power supply for both channels
Personally, I would take a different approach by adding 4 more caps (maybe half as large) and 2 more coils, but still using only one of transformers.
BTW, those transformers would be great for a high powered AlephX monoblocks (~200wpc).
| quote: | Originally posted by george a
Or I could do this to power subs as well (plus P1.7 Preamp).... |
This is not a good idea. You what your preamp power supply to be as clean as possible. |
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| george a |
Roddyama
you wrote
"One is 3X more then what is safe for both channels of an Aleph5"
Can you please explain what you mean please ...
How can too big a transformer be unsafe.
BTW these transformer have been powering a Hafler 200 clone for the past 15 years- without a single problem..
With respect to P1.7 Supply i intend to regulate supply to it..
Thanks in advance. |
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| roddyama |
| quote: | Originally posted by george a
Roddyama
you wrote
"One is 3X more then what is safe for both channels of an Aleph5"
Can you please explain what you mean please ...
How can too big a transformer be unsafe.
BTW these transformer have been powering a Hafler 200 clone for the past 15 years- without a single problem..
With respect to P1.7 Supply i intend to regulate supply to it..
Thanks in advance. |
Hi George,
I didn't mean to imply that you would be unsafe. Quite the opposite, you would be waring a belt, a rope, and suspenders. 800VA is a good safe transformer size for a stereo Aleph5. 2.5kVA is 3X safer,... if there is such a thing.;) |
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