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Old 12th December 2012, 03:26 AM   #1
Einric is offline Einric  United States
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Default DIY Audio F4 220u Capacitors

There are spaces on the DIY Audio F4 board for capacitors yet there are no capacitors on the BOM.
Would a 220u 35V Panasonic FC be sufficient for the application?

Thanks,
Richard
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Old 12th December 2012, 05:04 PM   #2
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It would be fine. The favorite would be the Elna silk caps at 220 uF.

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Old 12th December 2012, 10:13 PM   #3
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Hi Richard

Kinda lost track on the 'resistor thread'...
...guess you got 'em nailed.
Looks like Nelson's got you up to 'full capacity' on this one !
Another great amp on it's way !

Cheers.

Si.
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Old 14th December 2012, 02:56 AM   #4
Einric is offline Einric  United States
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Thanks Papa, I was looking at the SilmicII's at first.
I was thinking of using a 20V secondary and that would require 35V caps.
It was at that point I noticed the Panasonic FC's.
With the FC's @ $0.24 each I can order a bunch of them and hand match them.
I will be driving this with my Glassware 6CG7/6CG7 Aikido.
My F4 will be actively cooled to increase dissipation capability.
It just so happens my heat sinks are 125mm x 250mm so I will be able to nicely fit two 120mm computer fans at 9v or so to keep them quiet.

@ Space, I ordered the bulk of my Metal Film resistors @ 1% and hand matched them.
For the goofy value 22.1, 22.1k & 47.5k resistors I actually splurged on .1% precision resistors.
At first I ordered a whole PILE of 5% carbon films and hoped I could catch the exact values I needed.
Long story short I ended up with a whole HEAP of 22, 22k & 47k carbon film resistors.
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Old 14th December 2012, 03:31 AM   #5
Einric is offline Einric  United States
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Maybe I will just stick to 18V secondary.
It looks like my 2SJ74V's are a 25V part.
No biggie I will just get to use more Bias Current
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Old 16th December 2012, 10:03 PM   #6
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Hi Einric

Yes...I think 18v is the ticket on the Tx.

Probably a good thing the carbons didn't work out...
...I wouldn't use 'em myself, unless I deliberatly wanted a 'vintage' sound ( ie. muffled !!! )...
...OK for old guitar amps.

You know my current WW obsession anyhow !

Cheers.

Si.

Good luck with the build...
...with those fans...
...it's bound to be C O O L !
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Old 17th December 2012, 04:14 AM   #7
Einric is offline Einric  United States
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My .1% precision resistors for 22.1, 22.1k, 47.5k & 750 showed up yesterday.
They will be "Stocking Stuffers" for me, LOL.
Looks like Santa is bringing me a Pass F4 kit for Christmas this year.
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Old 17th December 2012, 10:40 AM   #8
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Hi Richard

Will the chassis fit down the chimney ?

Si.
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Old 17th December 2012, 12:25 PM   #9
Einric is offline Einric  United States
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The Chassis is about 250x130x225 not including the heatsinks.
The real challenge in this project will be finding a nice looking chunk of wood to cover the front panel and stick out far enough to hide the fans & heatsinks.

Santa's sack is magic don't ya know?
He can fit all the presents for every kid in the world in there.
I think he can make it fit down the dryer vent tube for me. LOL!
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Old 17th December 2012, 03:32 PM   #10
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Hi Richard

I like 'compact chassis' actually.
I have a DIY mosfet-amp...
...with 2x 18v transformers, 4x BIG reservoir-caps, 4x big-sq. rectifiers...
...in a chassis which is only 60x260x260 !!!
The heatsinks are on the rear-panel, not inside the case.

VERY LOUD...doesn't get hot in the slightest.

Will be interesting to see your build Rich.
Got a pic of the chassis ?

Cheers.

Si.
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