The drain pin of the mosfet is conected to the metal tag and has very litle thermal impedance thath is to me the best place where to stick them adesive or tie wrap the key is low thermal impedence
bksabath said:
Aha!! That's why the thermistor is placed there on the factory-built F5! I have been scratching my head, wondering why the thermistor looks like it's too short... 🙂
Specifically, these are the photos that I am referencing -- (from 6moons.com)
http://www.6moons.com/audioreviews/firstwatt7/f5_2.html
Scroll down a little, you will see 2 pics with the output transistor and thermistor clearly visible.
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oh , I see the thermistor is glued right to the middle pin.
I also thought about using some heat shrink tubing to insulate the thermistors.
oh, the crazy glue didn't hold. I'll have to just float that board.
I also thought about using some heat shrink tubing to insulate the thermistors.
oh, the crazy glue didn't hold. I'll have to just float that board.
If you need some form of glue to hold the standoff to the heatsink you might want to try metal epoxy.
Try a good auto parts store, if none local try online. That stuff has been very useful for a variety of apps and a lifesaver in others many times in the past; last time I looked they offered both a fast cure and slower cure version...
LePage Epoxy Steel is what I have used before. It contains metal, it can be sanded/worked after setting and isn't supposed to expand or contract. It won't be as strong as having things screwed down, but for a single PCB standoff, it should be just fine.
Products - LePage for Canada
You can get it at most local hardware stores for less than $8, probably less than $7.
Products - LePage for Canada
You can get it at most local hardware stores for less than $8, probably less than $7.
Arctic Silver has a couple products which are two part adhesives. They look interesting, although I haven't tried them.
Arctic Silver, Inc. - Arctic Alumina Thermal Adhesive
Arctic Silver, Inc. - Arctic Silver Thermal Adhesive
Arctic Silver, Inc. - Arctic Alumina Thermal Adhesive
Arctic Silver, Inc. - Arctic Silver Thermal Adhesive
Me think that heath srink should do the trick
Metal poxi to glue a tiny tiny ini winy bead to a skiny therminal?
Catch my drift?
Not telling you what to do but be careful with metal poxi as it may be conductive.
Papa uses superglue or such I think.
Metal poxi to glue a tiny tiny ini winy bead to a skiny therminal?
Catch my drift?
Not telling you what to do but be careful with metal poxi as it may be conductive.
Papa uses superglue or such I think.
I was thinking epoxy to tranny body but middle pin makes more sense. I have switching p/s that have a thermistor on the heatsink glued to a small metal eyelet then screwed to the heatsink next to the trannies it looks at .
I would think either would be OK but faster response to the middle pin.
OIC,Elwood
I would think either would be OK but faster response to the middle pin.
OIC,Elwood
The suggestion for metal epoxy was for gluing a standoff to the heatsink, not for anything related to the thermistor.
How about mucilage. Remember that stuff? Glue everywhere. It was like rubbing a runny nose on the paper trying to get it to stick.
RTV silicone
but - as you all can see from Papa's pics - you don't need to glue NTC ; just lean it next to mosfet case or leg
but - as you all can see from Papa's pics - you don't need to glue NTC ; just lean it next to mosfet case or leg
By opening up a case with paypal, and applying a little bit of pressure, HIFI 2000 is sending out a new heat sink.
The Credit Card issuer has an enormous effect on the retailer's sales.
As soon as you have the Credit Card on your side, the retailer gives in.
Reporting through PayPal is the first warning that the retailer gets that you mean business and expected to be treated as a valued customer.
As soon as you have the Credit Card on your side, the retailer gives in.
Reporting through PayPal is the first warning that the retailer gets that you mean business and expected to be treated as a valued customer.
Just out of curiosity, are they asking you to return the damaged one? (If not, it would be a great addition to your parts bin!)
😀Quote > By opening up a case with paypal, and applying a little bit of pressure, HIFI 2000 is sending out a new heat sink.
Realy made up for you😀
Got a few more pictures of my build.
A drill press would realy help but does not fit in the loft and to much noise.
The main frame is done so time to get started with the Circuit boards
Soft start and Aux suply From print to etched board in less than 30 minutes.
No picture for the back plate I got al the holes drilled and started to paint (mess it up I mean )
I realy realy hate painting
Realy made up for you😀
Got a few more pictures of my build.
A drill press would realy help but does not fit in the loft and to much noise.
The main frame is done so time to get started with the Circuit boards
Soft start and Aux suply From print to etched board in less than 30 minutes.
No picture for the back plate I got al the holes drilled and started to paint (mess it up I mean )
I realy realy hate painting
Everything is aluminum, isn't it? Have you considered anodizing it all?
That said, thanks so very much for posting more photos! Keep 'em coming!