The amplifier is probably working as it should but maybe the operator is not?🙂
The VFET case should measure hotter than the heat sink fins. Mix-up in reporting the temperatures?
The VFET case should measure hotter than the heat sink fins. Mix-up in reporting the temperatures?
🙂
I double checked, the top of the case is is indeed around 41C. The "valley" of the fins, where the T-Bracket mounts are at 48.5C.
I'm using a Raytech Laser thermometer
And I agree, counter intuitive for sure.
I double checked, the top of the case is is indeed around 41C. The "valley" of the fins, where the T-Bracket mounts are at 48.5C.
I'm using a Raytech Laser thermometer
And I agree, counter intuitive for sure.
He did write cooling fins, i.e. heatsink fins. I interpret that as the fins outside of the amp, and they can very well be 48 degrees C. If that measurement is as interesting as a on the V-Fets is another matter.
If you measure 1 cm next to the V-FET what do you get?
If you measure 1 cm next to the V-FET what do you get?
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Infrared thermometers may be inaccurate when measuring reflective surfaces such as bare aluminum or steel.
On the T Bracket, between the two transistors, 1cm from the transistor, i'm getting 41.5C
I see you are in Oslo, I grew up south of you, on Jeløy.
(It never reaches 41.5C there...)
I see you are in Oslo, I grew up south of you, on Jeløy.
(It never reaches 41.5C there...)
You can try using washers to fill up the gap. Personally I prefer using a hammer to dong out the tabs a bit. The force of tightening up the nut & bolt will close up any gaps.
I've found a small collection (x6 brand new wrapped in plastic) of these large cans last year:
https://i.imgur.com/bOiF5iXh.jpg
Date code: 44th week of 1973
I use a lot of salvaged parts in my DIY builds. I'm still alive 😀
Shhhhh....
that's a known secret!! Below I got desperate so I went slicing 
Apologies for the late replies, been away.
To be honest, I never found heatsinking an issue for this project as by the touch of hand, they were considerably cooler than the heatsinks in my other VFet amp dissipating 4 times the heat.
As papa said, use of thermal silicone grease can hide a lot of sins and transistors operate fine at 70C 😎
Hmm I can borrow an IR gun but a real thermocouple seems like a more accurate method. On mine after a half hour you can't touch either mosfet but upon cutting power you can touch them almost immediately. So it seems like the heatsinks are working efficiently.
