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Old 18th August 2019, 06:46 PM   #11
flamethrower1 is offline flamethrower1  United States
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After doing some more digging, I found a couple of people saying the snubbers are not needed unless you have a way of measuring the ringing from the diode board.
I also found this for a quick order BOM from Digikey, Digi-Key - Fast Add.
No idea where it came from.
Anyway, they are calling out 27000UF caps.
I am also beginning to think that not using the diode board and going with monolithic bridges might make things a lot easier
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Old 18th August 2019, 08:46 PM   #12
SRMcGee is offline SRMcGee  United States
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Flamethrower1:

You would be better off with a larger transformer for each F5T V3 mono-block. Iím using 1kw toroids and they are terrific. Get at least 600 VA; 800 VA would be better.

If youíre planning on using eight 27,000 uF caps in each chassis, youíre on target. I thought 160,000 uF, as proposed in NPís F5T article, was a bit anemic.

Regards,
Scott
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Old 18th August 2019, 08:58 PM   #13
brian92fs is offline brian92fs  United States
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SRMcCee - I believe you’re describing a PSU for a F5 Turbo build. He mentions a 18-0-18 transformer which suggests a “regular” F5 at 24V
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Old 18th August 2019, 09:38 PM   #14
flamethrower1 is offline flamethrower1  United States
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SRM, thanks for your advise.
I have the regular F5 V3 boards.
I guess all I am trying to achieve at this point is a DIY AMP that is very clean.
My musical preferences tend to be clean and concise rather than loud.
The board build is well documented it seems, not so much with the power supply.
Would help if I could do a search on this sight,I type in F5 or DIY PSU for a search and get no matches found
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Old 18th August 2019, 09:52 PM   #15
Dennis Hui is offline Dennis Hui  Canada
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This should help with the PSU:

diyAudio Power Supply Circuit Board v3 illustrated build guide
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Old 18th August 2019, 10:16 PM   #16
flamethrower1 is offline flamethrower1  United States
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ha, I looked at that thread I do not know how many times and finally see that my answer was right in front of me.
Now to find the caps, looked at Digikey and Mouser and they both show zero Qtys on 22000
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Old 18th August 2019, 10:33 PM   #17
flamethrower1 is offline flamethrower1  United States
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Well at least audio grade anyway
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Old 19th August 2019, 12:27 AM   #18
Ben Mah is offline Ben Mah  Canada
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Nothing wrong with these caps for power supplies:

B41252A5229M000 EPCOS / TDK | Mouser Canada

SLP223M025H5P3 Cornell Dubilier - CDE | Mouser Canada

The CDE cap is rated for 3000 hours at 105 C, and the price is right (Canadian dollars shown, so even better in US dollars).

I use these caps in my amps and I think most people do too.

https://www.mouser.ca/ProductDetail/...BYJdx9Vlp74%3D

if 35V cap preferred. I have used 25V caps in my FW supplies with 18V transformer secondaries with no issues so far.

Last edited by Ben Mah; 19th August 2019 at 12:43 AM.
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Old 19th August 2019, 01:02 AM   #19
flamethrower1 is offline flamethrower1  United States
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I thank you Ben Mah for your help and assistance, appreciated
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Old 19th August 2019, 03:25 PM   #20
rhthatcher is offline rhthatcher  United States
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You're going to need higher voltage than 18 on your transformer. I'm going to be building F5 V3's for a friend soon when all of his parts arrive. I have the chassis, boards, transformers, and a few other odds and ends in my car that I picked up yesterday.

He ordered one Antek AN-6435 per monoblock. You could kick it up to 800VA or more, too. I'll test both on my quasimodo / oscilloscope to size the snubber resistors. Maybe I can knock that out this afternoon. My experience is that the snubber values are pretty consistent across the same mfr and model number. I'll post the values here when done.


You're going to need higher voltage rated caps in the PSU with the higher voltage rails. He's going with 22000uF 63V Digikey: 565-4899-ND



If you haven't bought Mosfets yet, I'll be matching a ton of them for my buddy's amp, and kitting up more pairs and quads for others. I'll be posting them here as that happens. I expect that will happen sometime in the month of September depending on when he orders his last batch of parts.

Last edited by rhthatcher; 19th August 2019 at 03:29 PM.
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