I was thinking , Jeff .....
We should "modularize" the power supply section. 2 of these "uni-caps" and a
7-8" "L" shaped pre-drilled bracket.
I've seen so many projects where they just place the caps "where-ever" and
don't utilize the available space in a standard 3U-4U enclosure.
As far as total capacitance , 40mm panasonics (4-pin) go to 12.5Kuf @ 100V.
50Kuf per board. The H/K 990 (200W amp) uses 4 X 6800uF per channel.
PS - this would require getting the "uni-cap" PCB to 125mm length , to accommodate a 3U enclosure
(135-140mm inside height)...
Edit - Even better , they could mount the soft start and any other AC "stuff" on the back side.
Just 2 holes in the case for everything ( I'm doing this with 2 - 5 X 7" "L" brackets). 1 more big hole for
the trafo. That's it.
OS
We should "modularize" the power supply section. 2 of these "uni-caps" and a
7-8" "L" shaped pre-drilled bracket.
I've seen so many projects where they just place the caps "where-ever" and
don't utilize the available space in a standard 3U-4U enclosure.
As far as total capacitance , 40mm panasonics (4-pin) go to 12.5Kuf @ 100V.
50Kuf per board. The H/K 990 (200W amp) uses 4 X 6800uF per channel.
PS - this would require getting the "uni-cap" PCB to 125mm length , to accommodate a 3U enclosure
(135-140mm inside height)...
Edit - Even better , they could mount the soft start and any other AC "stuff" on the back side.
Just 2 holes in the case for everything ( I'm doing this with 2 - 5 X 7" "L" brackets). 1 more big hole for
the trafo. That's it.
OS
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I'm having trouble visualizing what you mean. Can you post some sort of sketch?I was thinking , Jeff .....
We should "modularize" the power supply section. 2 of these "uni-caps" and a
7-8" "L" shaped pre-drilled bracket.
I've seen so many projects where they just place the caps "where-ever" and
don't utilize the available space in a standard 3U-4U enclosure.
As far as total capacitance , 40mm panasonics (4-pin) go to 12.5Kuf @ 100V.
50Kuf per board. The H/K 990 (200W amp) uses 4 X 6800uF per channel.
PS - this would require getting the "uni-cap" PCB to 125mm length , to accommodate a 3U enclosure
(135-140mm inside height)...
Edit - Even better , they could mount the soft start and any other AC "stuff" on the back side.
Just 2 holes in the case for everything ( I'm doing this with 2 - 5 X 7" "L" brackets). 1 more big hole for
the trafo. That's it.
OS
Is this enough capacitance for a big power stereo amp? Slone's rule of thumb was 10000uf/rail/100 watts That would be around 60000uf for stereo 70 volt rails.
You know the 5 X 7" brackets you made me ??
A pair of these boards ( if shrunk down to 127mm /5") would fit perfect.
The PCB would then be 89 X 127mm , 2 of them would fit the "L" like
a glove. Caps/boards would be vertical , only taking up 180 X 90mm chassis space.
I still need to use those 50mm X 35mm snap-in's , my case only has 180mm X
65mm for the caps.
As far as sloan's rule - OVERKILL. H/K uses only 30Kuf per channel. My
"special" board will be 40Kuf /ch , "uni-cap" can be 50K.
I would rather have 4-6 caps at 40-50Kuf total , than 2 big ones @ 60+K. Caps in parallel perform better (ESR/ripple).
OS
A pair of these boards ( if shrunk down to 127mm /5") would fit perfect.
The PCB would then be 89 X 127mm , 2 of them would fit the "L" like
a glove. Caps/boards would be vertical , only taking up 180 X 90mm chassis space.
I still need to use those 50mm X 35mm snap-in's , my case only has 180mm X
65mm for the caps.
As far as sloan's rule - OVERKILL. H/K uses only 30Kuf per channel. My
"special" board will be 40Kuf /ch , "uni-cap" can be 50K.
I would rather have 4-6 caps at 40-50Kuf total , than 2 big ones @ 60+K. Caps in parallel perform better (ESR/ripple).
OS
Yes , that orphan board you are making is for 12 X 6800uF = 81.6Kuf
Here is a good link for electrolytics .... Checking Caps
He has much lower estimate for capacity " 1,000 uf or more per ampere" ... more
akin to the OEM choices.
My 1KVA trafo is rated 20A - I'm in line with 80k. I will also have 1/2 the ESR and
less ripple than "big caps". Also , according to the article - 75-80V on a 100V
cap is nearly ideal to give the longest lifetime ..... it forms the ideal oxide layer.
("forming and reforming caps -section").
EDIT - this article will make me power up my cap banks at 40V rail "burn-in" ....
there is a capacitor "burn-in" , after all (to initially form the oxide layer).
OS
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Of course there is! Saying "nonsense!" means you want to look smart or you just aren't smart enough
Just kidding but keep that in mind fellas OS, thanks for the link. I'm doing caps reconditioning right now. Have "burnt" 2 transformers
I'll be around the same ballpark as you then. I put 80 volt 3000hr/105C caps with ripple current of approx. 12 each at 60C in this one. My transformer is rated for 11.1 amps/rail.
Hehehe nothing happened with the metallic wire and magnetic core of course. I just didn't want to waste time troubleshooting the power supplies. It's just broken so I pull another power supply.
Same with amplifiers. If it doesn't work at first power up (no variac, no light bulb, no fuse), I throw it and build another one. I don't even bother to pull out the parts for reuse
Hehehe nothing happened with the metallic wire and magnetic core of course. I just didn't want to waste time troubleshooting the power supplies. It's just broken so I pull another power supply.
Same with amplifiers. If it doesn't work at first power up (no variac, no light bulb, no fuse), I throw it and build another one. I don't even bother to pull out the parts for reuse
It is garbage's such as yours which I seek.
such ample resources must be agreat privilege.
OS
Hehehe nothing happened with the metallic wire and magnetic core of course. I just didn't want to waste time troubleshooting the power supplies. It's just broken so I pull another power supply.
Same with amplifiers. If it doesn't work at first power up (no variac, no light bulb, no fuse), I throw it and build another one. I don't even bother to pull out the parts for reuse
What is the postage from Jakarta to India for such "Garbage" for 1Kg ?
Hehehe nothing happened with the metallic wire and magnetic core of course. I just didn't want to waste time troubleshooting the power supplies. It's just broken so I pull another power supply.
Same with amplifiers. If it doesn't work at first power up (no variac, no light bulb, no fuse), I throw it and build another one. I don't even bother to pull out the parts for reuse
I will accept your "garbage"
. (Kirim saja ke saya mas )