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How to use these huge caps in PSU for F5?
How to use these huge caps in PSU for F5?
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Old 10th October 2018, 01:58 AM   #11
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by AudioSan View Post
I would use a overkill transformer with those caps. And a 2x series connected CL60 based softstart that bypass the thermistors after a little while. Do not use a softstart with parallell connected CL60.
my scheme is that softstart before transformer, CL60 is on DC side. they serve different purpose
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Old 10th October 2018, 02:44 AM   #12
Hikari1 is offline Hikari1  United States
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Originally Posted by Hubba View Post
I've got my hands on some really huge 68000uF/40V caps, or rather four of them (may get an additional two), and I'm thinking about doing a PSU for my F5 using them as I kind of like the look of them.

However, my skills in the PSU domain are limited at best, so I would appreciate some help. Using the standard Pass F5 PSU schematic, is it possible to simply replace C1&C2, C3&C4...with one of the caps, or would that mess things up?

Thanks,
Fredrik
That’s totally fine to do, just put R (resistor) or L (choke) between the two caps. You won’t need more than a single cl60 most likely. I use 6x33,000uf with a single cl60. Be aware that the stud on that capacitor may be connected to ground and will need to be isolated.
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Old 10th October 2018, 05:09 AM   #13
AudioSan is offline AudioSan  Norway
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Quote:
Originally Posted by gadut View Post
my scheme is that softstart before transformer, CL60 is on DC side. they serve different purpose
You are looking at the wrong CL60.
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Old 10th October 2018, 07:52 AM   #14
Hubba is offline Hubba  Sweden
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Smile Thank you for all the input!

Thank you all who has helped answering my questions, as well as pointing out potential problems.

I'm going for a standard CRC setup using in total 4 of the caps.

As some of you have pointed out the in rush current may be an issue, but I have a separate soft start Circuit (with 4xCL60 and a by pass relay) which takes care of that...

Once again, thank you all for valuable input!

Cheers,
Fredrik
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Old 10th October 2018, 01:40 PM   #15
AudioSan is offline AudioSan  Norway
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Quote:
Originally Posted by Hubba View Post
Thank you all who has helped answering my questions, as well as pointing out potential problems.

I'm going for a standard CRC setup using in total 4 of the caps.

As some of you have pointed out the in rush current may be an issue, but I have a separate soft start Circuit (with 4xCL60 and a by pass relay) which takes care of that...

Once again, thank you all for valuable input!

Cheers,
Fredrik

That is just the kind of softstart you never should use. They have parallell connected thermistors. two and two in parallell and the two couples are series connected. Or all 4 are in parallell.
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Old 10th October 2018, 05:57 PM   #16
Hubba is offline Hubba  Sweden
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@AudioSan

Why is that a problem?

/Fredrik
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Old 10th October 2018, 06:11 PM   #17
AudioSan is offline AudioSan  Norway
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Thermistors change impedance with current draw. And current takes the path of least resistance. So you will get current hog on one of the thermistors (or two if the are two and two in parallell).
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Old 10th October 2018, 06:27 PM   #18
Hubba is offline Hubba  Sweden
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ah, yes..ok

The thermistors are only in play for a couple of seconds, after that a relay closes and the transformer is fed from that path instead.

/F
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Old 10th October 2018, 09:37 PM   #19
aspringv is offline aspringv  Australia
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How to use these huge caps in PSU for F5?
Hi Hubba, is it one of these by chance?

Just be aware that I think theres some pretty reasonable leakage current through this item. I used on on an aleph build and the led's on the amp boards would never quite go off... concerning enough that I unplugged it.

I should really open that guy up and do some checking actually!
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Last edited by aspringv; 10th October 2018 at 09:38 PM. Reason: added pic for the lazy
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Old 11th October 2018, 03:28 AM   #20
dazed2 is offline dazed2  Canada
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No problem at all!
Go CRC

But I do think you need a slow charge circuit.

P1010730.jpg

F5 Turbo PSU inside.jpg
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