Salas hotrodded blue DCB1 build - Page 72 - diyAudio
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Old 22nd December 2010, 07:04 AM   #711
hates ground loops
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I wouldn't say "necessary", just very very beneficial. Especially if the heatsink's contact surface isn't the smoothest. The idea is that you increase the contact area between two solid surfaces that are not perfectly flat. You only need very little, I usually apply it to the semiconductor and spread it with a toothpick, and once you tighten the mounting screw you can remove the excess goop. Locally you might find some in a computer store (for CPUs).
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Old 22nd December 2010, 07:58 AM   #712
Marra is online now Marra  United Kingdom
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The reply from "Along"

Hello,sir
Due to the bad weather recently,The air mail are very very slow,most of our package sent to UK on early November still on the way,many buyers impatient to wait so long delivery time and open disputes to ask full refund,so,we only can except some countrys temporary.
We appreciate your understanding.

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Old 27th December 2010, 04:12 PM   #713
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I've got them powered up.

I forget what I should test for voltage wise. Anyone have references voltages I should look for?

Click the image to open in full size.

Click the image to open in full size.

Folding the mosfets over was the only way I was going to mount these heat sinks. I'm wondering if I should drill another hole in these mosfets and secure them to the chassis.

Merry Christmas,
JG
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Old 27th December 2010, 04:17 PM   #714
Atilla is offline Atilla  Norway
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+/- 9-10-11ish volts is what you're looking for as output.
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Old 27th December 2010, 04:44 PM   #715
hates ground loops
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Drilling another hole in the Mosfets? You're joking, right? Don't do it.
Are the Mosfets electrically insulated from the heatsinks? Otherwise your setup is prone to shorts.

Look for my build a couple of posts back and you'll find some reference voltages. Easy and probably first thing to check is the buffer's output offset relative to ground, which should be smaller than 5mV in either direction.

Nice build!
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Old 27th December 2010, 09:33 PM   #716
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No, I just have some thermal grease between the mosfets and heat sinks.

I've had to drill a hole in each of them so I could actually fit them onto the board.
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Old 27th December 2010, 11:59 PM   #717
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Ok, I guess I'll have to pick up some of these?

AAVID THERMALLOY | 189790F00000 | TO-218/TO-247 Package 0.009" Thick No Adhesive Silicone Insulator - Future Electronics
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Old 28th December 2010, 12:19 AM   #718
Salas is online now Salas  Greece
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You will do well to pick some of those for using in power amps output stages also. Very handy. You meant you drilled holes lower on the sinks I suppose on your previous posts? Not on the TO-247s themselves, yes?
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Old 28th December 2010, 01:12 AM   #719
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Yes, I drilled holes lower on the heat sinks so I was able to mount the mosfets on the board.

I have thermal grease, not insulators between them. I was thinking of securing the heat sinks to the chassis.
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Old 28th December 2010, 01:23 AM   #720
Salas is online now Salas  Greece
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Only after insulation you secure them to the chassis. Else you will zap them.
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