Electronics > Projects, Designs, and Technical Stuff
My constant current load - 90W , 3A 30V
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Spikee:
Thanks for the info ... it was kinda obvious that insulation would melt but i didn't look at it in that way  :(
Monday i will test and aim for a 90W total load whit heatsink and present the result here.
LEECH666:
Ah yes T4P! Good call.

A problem this guy also faced.



Subtitle translation: ... and this is what you get when you let too much current flow. The MOSFET is getting so hot that even solder starts to get soft (again.)

And you can clearly see that he switched to some sort of screw terminal connection in the next two pictures.





Cheers Florian

blackdog:
Hi Spikee,

Some pictures of my Active Load, i'am testing it at the moment, and adjusting it.

Full Speed!!! ~280 Watts


Top View, yes, when I'm done is the wiring decent  ;D


Side view,


The temperature is just below 85C @ one off the MJ15004 transistors @ 220Watts total dissipation.
Heatsink + 4x MJ15004


Regarts,
Blackdog
LEECH666:
Hi blackdog,

nice construction!

Is there any benefit in using BJTs instead of FETs?

Cheers,
Florian
blackdog:
Hi Leech666

I tried to build him with the parts I had, and I had 20 pieces MJ15004.
I Like the TO3 form because you can get good thermal contact.

But i also use Fets a lot in TO247 package.

Regarts,
Blackdog
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