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Czech Pro 2 controller question

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#1 Casey Scott

Casey Scott

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Posted 25 November 2016 - 09:47 AM

Hi All,

Im trying to find out some information on the Czech Pro2 controller. I have one and im trying to find out the model of the 2 power transistors on the controller. Mine do not have any model numbers on them. I know that they are Darlington Power Transistors, but I dont know the rating.. I think they may be 25A each, but im not sure.

Any help would be appreciated...

Heres a pictures for reference...File_000.jpeg

Casey Scott

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#2 smichslot



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Posted 25 November 2016 - 04:49 PM

Hi Casey,


Well, well.well.

As I have stated a couple of times at this or other forums the power transistors in a Pro-2 are single emitter-followers, NOT Darlington-transistors.

Darlingtons are used in the Pro-3, which is not made by the same guy who made the Pro-2.


I have tried to repair Pro-2 with 2N5886 (which are 25A types) and that seems to be working fine, thank you very much. However, I would probably recommend 2N5686, which are 50A/300W types. There is no reason to try to match the transistors, because at the currents our cars are pulling the internal emitter-resistance of the transistors are almost balancing the currents between the 2 transistors. 


Go for it!



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