Re: BS170 Heat flow experiment with results
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Tony,? That was a very well done experiment. Bravo!
It should do much to dispel the "all the heat leaves via the leads" myth that resurrects from time to time on this forum.
Thank you for that excellent work OM.
73 JZ KJ4A?
Very informative measurement by Tony.
The heat is therefore primarily dissipated via the FET housing and the drain wire, i.e. onto the board.
I don't have such convenient measuring technology.
A measurement on a closed QMX would also be interesting:
- a sensor between the FETs (FET temperature)
- a sensor on the board (board temperature)
- an air temperature sensor between the board/display
- a sensor on the lower housing shell
This would show where the heat dissipation should be improved (cooling hoods on the FETs or board to housing).
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