Salas hotrodded blue DCB1 build - Page 244 - diyAudio
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Old 23rd November 2012, 10:45 AM   #2431
Salas is online now Salas  Greece
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Nice it has been solved. Was that 550 a C type, or?
CCS resistors difference in voltage across is a matter of Vgs in different associated MOSFETS. No worries.
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Old 23rd November 2012, 11:08 AM   #2432
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Package is here Niko

Party time with Caddocks today
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Old 23rd November 2012, 11:17 AM   #2433
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Old 23rd November 2012, 11:55 AM   #2434
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yes, BC550C!

last few things (I hope so) to clarify, do I need thermal paste if I use Kapton?

I'm going to add step attenuator that should be placed before the buffer as it was mentioned several hundred pages ago here However if I want to separate buffer from preamp (attenuator & buffer) is the wiring below correct in case that there always be only one source connected?
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Old 23rd November 2012, 12:57 PM   #2435
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Don't know the thermal resistance of Kapton high temp tape. If its more than 1C/W that a common Silpad achieves, better avoid. Paste for Mica like films, yes. For Silpads, no.

I don't follow the above sketch easily, but in words, you should tap off from DCB1 (in) after the pot to a couple of extra outputs when needing non buffered attenuated outputs beyond the buffered attenuated normal ones you get from DCB1 (out).
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Old 23rd November 2012, 01:26 PM   #2436
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Quote:
Originally Posted by Salas View Post
Don't know the thermal resistance of Kapton high temp tape. If its more than 1C/W that a common Silpad achieves, better avoid. Paste for Mica like films, yes. For Silpads, no.

I don't follow the above sketch easily, but in words, you should tap off from DCB1 (in) after the pot to a couple of extra outputs when needing non buffered attenuated outputs beyond the buffered attenuated normal ones you get from DCB1 (out).
Hi Salas,
Do I need to apply any thermal paste like those we use on CPU heatsink for Silpad?
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Old 23rd November 2012, 01:30 PM   #2437
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If its a hot rod and you use Mica, those for CPU are best, but see they are non conductive.

For Silpad NO. Makes it worse.
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Old 23rd November 2012, 01:32 PM   #2438
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From what I read in the description of Kapton it seems to be a heat resistant tape. It seems to block heat for example for heat wave soldering and not let it pass through.
In a heatsink you need exactly the opposite
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Old 23rd November 2012, 01:43 PM   #2439
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by Salas View Post
If its a hot rod and you use Mica, those for CPU are best, but see they are non conductive.

For Silpad NO. Makes it worse.
Then what should we use for white Silpad ?

Thanks
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Old 23rd November 2012, 01:54 PM   #2440
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Just the Silpad, no thermal paste.
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