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Old 19th September 2007, 07:12 AM   #31
AndrewT is offline AndrewT  Scotland
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Quote:
Let me know if you can get large electrolytics though say from 2200u to 10000uf under 25mm diameter, 50V.
Hi,
I can find upto 4700uF 63V in 25mm diameter.
I have not been able to find any 4700uF 50V as small as this, possibly due to the low profile high diameter that seems to be more common at this voltage.
To find any decent uF for smoothing and high local decoupling at under 25mm will be an achievement.
Any sources out there?
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Old 19th September 2007, 07:54 AM   #32
Nordic is offline Nordic  South Africa
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Just a quick scan through RS Components catalog.

Panasonic TSUP 50V 4700 stock no. 3396865
Phycomp 50V 4700 sn. 4406777 both pretty expensive
enter 38 zar in usd, or whatever your currency is, in google

Looking at the datasheet TSUP is available in 10000uf 25 x 50, panasonic parts no. ECOS1HP103C. Not sure where one would source that...

I settled for jamicon 4700uf which I think were about 22mm...
Local price about ZAR14 + 14% VAT.

A 2200uf cap has a ripple current rateing of about 2A a 4700u 3A...

The output pair's caps I took out the spades and used over 30mm 10000uf caps there, but this is way overkill I believe...

I doubt any diffirence would exist if I used the 4700ufs all around.. especialy not with driving 8 ohm loads...

I think Carlos is useing even less...
The original DX specified 47uf... On Graham Maynard's advice I upped this to 10000uf on the output, with amazeing results.... so that concept... and the capacitors stayed with me...

P.S. 50VDC cap has 63VDC surge rateing.

I would say a reasonable supply voltage would be between 24 and 38VDC so there is the chance... that if you operate at the smaller scale, that you could even use say 35VDC caps

The board is at the limit for half a eurocard, and I am seriously thinking in hindsight, we might need to go for a 2oz copper thickness for the guys running 4ohm speakers.
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Old 19th September 2007, 11:53 AM   #33
...truth seeker...
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Nordic,

For those traces which would really benefit with the additional copper thickness: What about using the "standard" copper and remove the solder mask from the traces that need an increase in capacity? Would the solder overlay be an acceptable, effective way to increase current carrying capacity?
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Old 19th September 2007, 12:10 PM   #34
Nordic is offline Nordic  South Africa
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I'm pretty sure a solder layer is more than adequate, and you do have a fairly good idea there... I was looking into the wall of how will people get more current through there with the silkscreen on... Then I typed some number into a trace calculator... and it suggested I'd be OK provided I went for the ticker copper....

Your way sounds wonderfull... Into 8 ohm loads, this is not a worry....

P.S. no wonder I had such a battle with the SMDs last night... turns out they were 0603... only realised this when I picked up the remaining values in 0806 from the shop... these look much easier to cope with... allthough according to my multimeter I did OK last night...
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Old 19th September 2007, 02:33 PM   #35
rellum is offline rellum  France
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Hello Nordic,

One set (2 boards) for me.

Regards,
Francis
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Old 19th September 2007, 03:56 PM   #36
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Hi Nordic,

thanks for count me in... with also the parts to go with...

I'm little worry with the solder layer as discussed laterly...
My speaker go down to 3.9 ohm...

Would this be a problem?

REgards,
---
David
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Old 19th September 2007, 04:31 PM   #37
Nordic is offline Nordic  South Africa
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No, Bongo gave Ed a good idea... we will place no soldermask over the large current traces... you can just apply a coat of solder to them...

... now Ed is going to claim he thought of it himself...
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Old 19th September 2007, 06:32 PM   #38
...truth seeker...
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Quote:
... now Ed is going to claim he thought of it himself...
If only I were that smart...I came into the world with nothing...what I know comes from others, even Mongo...as it was given to me I should give it to others...

Click the image to open in full size.
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Old 19th September 2007, 06:52 PM   #39
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Help,
Is there someone in Europe that can take my order so I can pay with IBAN and SWIFT number.The reason is I don't use visa so I can't pay with Pay-Pal.
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Old 19th September 2007, 07:24 PM   #40
lgreen is offline lgreen  United States
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Default stereo set for me

I'm in for a stereo set.

Having read a lot of carlos posts, I think I owe it to him to try this one out.
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