Aleph 30 parts for Peter Daniel's boards

[doggy]

Heat Sinks

I have the P Daniel a30 pcb's as well. Parts Express may be a source for a transformer. To me the biggest issue is the heatsink. I was wondering if 2 extrusions 12"x5.375, .375 thick base plate with 1" tall fins would be enough cooling? They are available on ebay. I could also set up a computer fan for extra airflow.Any opinions on this?

Thanks

 

[HIPCHECK]

maybe this is of interest to us Pass amp fans. found it while digging thru ebay

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280076820327&ssPageName=MERC_VIC_RUPX_RUPX_Pr4_PcY_BIN_Stores_IT&refitem=280074032679&itemcount=4&refwidgetloc=closed_view_item&usedrule1=UpSell_LogicX&refwidgettype=cross_promot_widget

i have know idea if this would help in building a A30, but it is a heap of sinks!

 

[jacco vermeulen]

That lot of 10 costs $1030.- st included overhere, wholesale.
1.25 C/W for a 4" length.

 

[Pathmark]

heat sink

hey doogy,
I went ahead a bought a pair of those 12" pieces as a start point but I plan to add a 1/4" of copper plate to them for increased dissipation. Actually I am following design similiar to Brian D.
Pathmark

 

[bugg]

I picked up a six of these heatsinks from BGMicro. Their shipping is kinda high, but the price for the sinks makes it an ok deal.

I can't decide if I need to use two or three of them per channel.

 

[BrianDonegan]

If you order from BGMicro, in the little Notes field they give you, ask them to use USPS Flat Rate box. They will do it for you and you will save a bundle.

 

[jacco vermeulen]

Sorry Bugg,

the heatsinks are awfull.

But i like the broccoli, love the teapot, and you're a Pro DIY from the looks of the kitchen project.
(Mmm@, and i stole the tired dogs picture)

@ Copyright of Masternut, Aus.

 

[bugg]

We'll certainly found out how awfull they are once I get the thing running. I figured they should be able to cool 2 FETs each, but when I got them they seemed bigger than I expected.

oh and the broccoli doesn't make a very good heatsink 😀

Michael.

 

[steenoe]

I can't decide if I need to use two or three of them per channel.

Use all of them! You probably allready heard that an Aleph 30 needs heatsinking? Think again, it needs a lot of heatsinking!! Just connect those fets, though leads and spread the heat as good as you possibly can!

Steen🙂

BTW the broccoli needs water

 

[Ed LaFontaine]

I just recieved my parts from

http://www.tech-diy.com/hexfets.htm

matched triplets of IRFP240's and pairs of IRF9610's

A note is in order. That site lists IRFP9610's. I corresponded to ask about that. They are IRF9610's. I'm sure there will be a change to the site when he gets around to it.
If you want to combine several items into one shipment it probably would be of benefit to send a note about that also.

The parts arrived in rails and anti-static bags. A good source.

 

[doggy]

Pathmark, looks like you will have good heatsinking, I have not yet bought any parts!
I think the thickness of the heatsink base plate is important, a thicker plate will spread the heat better and avoid local hot spots.Still looking at ebay. 🙂

Ed says

matched triplets

of Irfp240's

I assume the triplets will be close enough that 12 matched irfp240's are not necessary?
🙄

 

[Pathmark]

Fellas,

I also had good luck with tech-diy. I bought enough parts for 4 boards and everything is matched nicely. thanks for doing your homework ed.

I received heatsinks yesterday and they look great, thick base but as everyone keeps mentioning I am still worried about the heat.

Pathmark

 

[jacco vermeulen]

JFTR,

the heatsinks Bugg got for his Aleph/30 are not only great, but so cheap that i'm too damn jealous to be nice.
Even by the 6 in a cheap USPS Mondiale box, they'd cost me an additional $15/pc in mailing and dot-dot-dot taxes to buy them myself.

Bugg can expect 0.35 C/W at the least from a single one of his heatsinks, possible even a lot less if it's an efficient design. I hate you, Bugg.

 

[bugg]

According to Rod Elliott's heatsink calculator spreadsheet they should do .39C/W. With only 2 fets on each one I would think this thing might almost be kid safe. I couldn't imagine finding anything this size for so cheap. They are used but the ones I got don't have any obvious scratches.

Don't worry Jacco my broccoli hates you too

~michael.

 

[Ed LaFontaine]

I hate you, Bugg

That's just a way to ask for your best cookie recipe... which I'm sure will be "terrible" 😀

 

[Ed LaFontaine]

triplets will be close enough (?)

They are sold as triplets. In 12 samples the low value was 4.60, the high value was 4.63.....0.03/4.60... Less than a percent

I think the weak link in my system will be somewhere else. 😀

 

[doggy]

Thanks Ed, I also will order those same parts

steenoe says

just connect those fets, through leads

This would be a good way to spread the heat but will there be any performance change, perhaps speed and are additional parts needed to do this? 🙂 🙂

Digikey has the 3 watt panasonic .47r, part # is: PO.47W-3BK-ND, the no. will not work as a parts search, search this way in the parts window: panasonic .47, then scroll down to metal oxide[6] and you will find them .51 each or 5 for 2.38. At a certain order size, shipping is included[last time I did this]

 

[BrianDonegan]

At a certain order size, shipping is included

Maybe it's a Canadian thing. I order from DigiKey all the time (every other week or so) and have never had shipping included. 🙁 (Not small orders either)

 

[doggy]

Brian, you are correct! my mistake. What it is that on orders less than $32.50 they add a $6.50 handling fee. So on orders bigger than $32.50 can., the handling fee is waived, just the $8.00 delivery fee, up to a certain weight.

 

[Zen Mod]

JFTR,

the heatsinks Bugg got for his Aleph/30 are not only great, but so cheap that i'm too damn jealous to be nice.
Even by the 6 in a cheap USPS Mondiale box, they'd cost me an additional $15/pc in mailing and dot-dot-dot taxes to buy them myself.

Bugg can expect 0.35 C/W at the least from a single one of his heatsinks, possible even a lot less if it's an efficient design. I hate you, Bugg.

hehe
look at these.......each capable of coolin' ~50W with 25 Celsius rise above room temp.......
on pic-middle row,most right-you see two white marks ....of 50W Golden Dales ,used for measuring;

I have 4 more ,not on pic,slightly taller........

these 14 + 4 cost me 90 bloody Euros at junkyard.........they even lowered Al prices later........I hate them!