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Old 26th March 2013, 11:35 AM   #1
gmonno is offline gmonno  Italy
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Default Mounting semiconductors : mylar insulators

I'm building a Tubelab SE.
I'm reading the manual and reviewing the parts I ordered from Digikey (thanks George).

The thing is that it says to mount a mylar insulator between the heatsink and the semiconductor, but Digikey did not send me these insulators.

Should I have buyed them (there wasn't a key in parts list) or should they have come with the semiconductors?

Now where can I find them o replace with what?

Thanks for the help

gmonno
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Old 26th March 2013, 12:15 PM   #2
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Are the semiconductors plastic construction or metal tab? If plastic use heatsink compound only. If metal use heatsink compound and mylar insulators.

Last edited by JonSnell Electronic; 26th March 2013 at 12:16 PM. Reason: Spelling
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Old 26th March 2013, 01:50 PM   #3
gmonno is offline gmonno  Italy
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They are metal.
The problem is that I dont' know where to fin mylar insulators, anyway lookiing aroud have discovered that Digikey part is : BER114-ND

Thanks for help

gmonno
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Old 26th March 2013, 02:09 PM   #4
godfrey is online now godfrey  South Africa
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Mylar? All the ones I used were mica.
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Old 26th March 2013, 03:57 PM   #5
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The insulators are something you need to buy. They are also important because the metal tabs are considered 'hot'.

I used this (4724K-ND):
4724 Keystone Electronics | 4724K-ND | DigiKey

If you don't want to make an order just for this, I've had good like salvaging the mounting hardware and insulators from junk boards (UPS battery backups are a good source).
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Old 26th March 2013, 04:59 PM   #6
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Quote:
Originally Posted by gmonno View Post
I'm building a Tubelab SE.
I'm reading the manual and reviewing the parts I ordered from Digikey (thanks George).

The thing is that it says to mount a mylar insulator between the heatsink and the semiconductor, but Digikey did not send me these insulators.

Should I have buyed them (there wasn't a key in parts list) or should they have come with the semiconductors?

Now where can I find them o replace with what?

Thanks for the help

gmonno
Sorry, not thinking, didn't correct the quotation from the questioner. Either use mica with heat-sink compound or silicone and no compound.
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Old 26th March 2013, 05:14 PM   #7
gmonno is offline gmonno  Italy
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Many thanks to all, I live in Spain and I'm pretty sure I'll find them in an electronic shop.

My other problem now is how to lower the voltage of the trasformer to match the 630-0-630 , as I ordered a 700-0-700 one.

Thanks again

gmonno
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