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Old 7th January 2013, 06:52 PM   #81
Philfr is offline Philfr  France
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Hi JM,
Thank's,
Year: 2009, this is an old piece, I hope that the date is not exceeded péromption
No, it's a joke..
To Mooly,
I agree..
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Old 28th January 2013, 12:19 PM   #82
Philfr is offline Philfr  France
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G'day,
Working in progress, slowly

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Old 28th January 2013, 12:21 PM   #83
Philfr is offline Philfr  France
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Old 28th January 2013, 12:22 PM   #84
Philfr is offline Philfr  France
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Old 28th January 2013, 12:49 PM   #85
JMFahey is offline JMFahey  Argentina
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On second look I'm a little worried about your "micas".
In some pictures they look dark orange.
*If* they are transparent , dark orange and "hard" (can be bent but flipping an edge with the nail makes a "click" sound) then they are probably a sheet of Kapton (or tinted Mylar) and *need* grease.
Now if they are like a sheet of thin rubber, which are opaque (the rubber is loaded with zinc oxide dust or some other thermal transmission enhancer) and "soft" , similar to a rectangle cut from a Kid's Party balloon, yes, they are Silpads and don't need grease.
Some kind of "paste" or elasticity is needed because neither the transistor back nor the heat sink are *perfectly* flat and "something" must fill those almost invisible air pockets.
Please confirm.
If you need to add some grease, no big deal.
Even if mounted, you just unbolt them and spread a little grease with a toothpick; later pressure will spread it where it's needed.
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Old 28th January 2013, 01:31 PM   #86
Mooly is offline Mooly  United Kingdom
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That's coming along nicely

Remember to power it with a bulb tester initially and confirm all is well. For just two chips that draw a minimum of quiescent current I would use something like a 40 watt bulb.
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Old 28th January 2013, 02:28 PM   #87
Philfr is offline Philfr  France
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Hi JM,
Mica's is like this :
TO-220 Silicone Heatsink Kit
Thank's for you comment.

Hi Mooly,
Thank's, but sorry, I don't understand very well
You mean : connect a 40 w bulb on loudspeaker output ?
What voltage ?
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Old 28th January 2013, 02:59 PM   #88
JMFahey is offline JMFahey  Argentina
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Mmmmhhh, they don't *really* say what it's made of.
Although "silicone" hints more towards a "rubbery" material, than to a rigid one.
Let your nails test it

As of the "40W bulb", wooly refers to some version of this:
Light Bulb Limiter
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Old 28th January 2013, 03:31 PM   #89
Philfr is offline Philfr  France
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At touch it is pliant and soft like silicone..
Thank's for "40 w bulb" link, I understand better now.
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Old 28th January 2013, 04:02 PM   #90
AndrewT is offline AndrewT  Scotland
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Phil,
big loop areas and big inductances !
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