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Old 8th December 2004, 01:44 AM   #11
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I really like the TATCA and love the oversized heatsinks.

I see you and Peter Daniels use serial ports from the rectifier. Are they hard to wire? What awg are the serial wires? How much power can they handle?

Where did you get the knob?

Do you prefer Brian's old boards over the new ones with the Zobel or were those boards laying around the house?

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Josh
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Old 8th December 2004, 02:32 AM   #12
Vikash is offline Vikash  United Kingdom
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I was going to go with a 9 pin D type connector but then I wouldn't have enough pins to power LED's as well. The denser 15 pin version is easy enough to work with. I used 16/0.2 (0.5mm2) equipment wire for the connections. The longest runs within the amp are less than 4 inches.

I haven't made the umbilical cable yet, and interested myself what Peter used for this purpose.

The knob is from RS Components (not Radio Shack). On your side of the pond you have much more variety and accessibility to control knobs.
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Old 8th December 2004, 04:05 AM   #13
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What type of power supply are you thinking about using?

(I was just reading the thread about GC speakers) what speakers are you going to power?

Thanks,

Josh
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Old 8th December 2004, 04:41 AM   #14
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Personally, I prefer the old boards, because Zobel network messes up the ground plane in case you are not using it (and I never do)

As to the umbilical cable, you can basically use anything: CAT5 comes to mind, I'm still using Cardas 20ga, and some ready made, computers cables are available as well (and they are already terminated).
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Old 8th December 2004, 05:01 AM   #15
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Sweet...
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Old 8th December 2004, 05:36 AM   #16
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Quote:
Originally posted by Peter Daniel
... computers cables are available as well ...

Peter, how much current do you think computer cable/plugs can carry? Should 2 pins/wires be used for each voltage rail when used as umbilical for a 3875 or 3886 chip amp? I'm guessing that a single wire is right on the edge...
Cheers.
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Old 8th December 2004, 09:30 AM   #17
ROVSING is offline ROVSING  Denmark
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Very nice work vikash !
I am going to build my gainclone like that, using cupper flat bars as heatsinks instead of aluheatsinks to make it even smaller.
Keep up the good work - i'm inspired.
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Old 8th December 2004, 09:43 AM   #18
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Quote:
Originally posted by ROVSING
Very nice work vikash !
I am going to build my gainclone like that, using cupper flat bars as heatsinks
Don't forget that the surface area is the most important thing. A flat copper bar is proabaly much worse heatsink than a regular shaped one in aluminium.
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Old 8th December 2004, 10:13 AM   #19
ROVSING is offline ROVSING  Denmark
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In this case, Per Anders, i don't think that it matters i am going to use flatbars measuring 100*50*10 mm, one for each chip/side - copper leads the heat away twice as good as aluminium, if you take a look at Peter Daniels gainclone in the BrianGT gallery i suppose that he also used copper ca. 25*25*100 mm fore both chips, the coolingarea are much smaller there, but i'm sure that it works fine. (sorry if i'm wrong Peter D i was just guessing....)
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Old 8th December 2004, 10:51 AM   #20
Vikash is offline Vikash  United Kingdom
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I believe copper conducts better, but alu dissipates heat better. Either way any heatsink that thickness I would presume to be ok.
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