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Old 15th February 2013, 11:09 AM   #1601
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Hacksaw and files! Wow that's diy!

Looks very nice. I like.
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Old 15th February 2013, 01:20 PM   #1602
WalterW is offline WalterW  Netherlands
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Very nice Omishra !
Nice layout. Good idea to put the tranformer under the capacitors.
I'm building a similar Turbo version 2, and keep that in mind...
Is the 0.55A bias the maximum the heatsinks can disipate? How hot do they get? Cause if I calculate 2.2A x 33V it is "only" 73Watts per sink, and it looks like they can do much more...
From where did you get the speaker ground to the connectors? From the amp-pcb or from the PSU?
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Old 15th February 2013, 01:21 PM   #1603
john65b is offline john65b  United States
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Are the transistors connected to the sink with an L bracket?
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Old 15th February 2013, 02:41 PM   #1604
omishra is offline omishra  India
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Thank you everybody!

Quote:
Originally Posted by john65b View Post
Are the transistors connected to the sink with an L bracket?
No, they are directly over the heatsink. Please see more pics here.
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Old 15th February 2013, 02:58 PM   #1605
bcmbob is offline bcmbob  United States
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What did you use for insulators on the HS/transistors joint? They are very clean and appear as no spacer was installed. I've been looking at this.
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Old 15th February 2013, 04:01 PM   #1606
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Quote:
Originally Posted by bcmbob View Post
What did you use for insulators on the HS/transistors joint? They are very clean and appear as no spacer was installed. I've been looking at this.
FWIW, I have a roll of Kapton/polyimide tape left over from another project that I have used on my DCB1 buffer and Mini-A without issue (so far). I applied the tape to the part, used a small drill bit in my fingers to poke the hole for the screw, and trimmed the edges with a razor. I did not use any grease although perhaps I should consider that......
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File Type: jpg kapton.JPG (666.2 KB, 893 views)
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Old 15th February 2013, 04:09 PM   #1607
bcmbob is offline bcmbob  United States
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Thanks for the info. My thought was using the film would eliminate any heat insulating properties of the tape. Should have some on hand (1" wide) next week and will experiment.
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Old 15th February 2013, 04:31 PM   #1608
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http://www.linearaudio.net/images/st...%20PK%20lr.pdf

http://www2.dupont.com/Kapton/en_US/..._datasheet.pdf
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Old 15th February 2013, 04:54 PM   #1609
bcmbob is offline bcmbob  United States
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jacco, that's a great link and exactly what I've been looking for over the past few days. I was on that Dupont site but couldn't find a retail vendor. Do you know of a source?
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Old 15th February 2013, 04:59 PM   #1610
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Fraid not, Kapton isn't my thing, sorry.

(just thought you might like to see the numbers)
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