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  1. Replies
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    Hi Rob, Try to look this up on FB, as ISRA 2019...

    Hi Rob,
    Try to look this up on FB, as ISRA 2019 have a thread just about the arrivals and ride-sharing to Corby. You'll get new friends!

    Steen
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    A Great contraption!. I anybody would like to...

    A Great contraption!.

    I anybody would like to make measurements instead of visual impressions the motor could be exchanged by a resistor pulling something like 1A. This could be a 10ohm...
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    This is how it's done. The only requirement is...

    This is how it's done. The only requirement is that you have a 12V power supply that can give current enough to make a car spin its wheels.

    1) Connect the controller to the power supply: Red wire...
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    Hi CK, It's pretty obvious that you've never...

    Hi CK,

    It's pretty obvious that you've never had the need for any of the more advanced controllers, and the reason can either be that they are "off-limits" or that you have never run a car that...
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    I have not heard about any Controllers that has...

    I have not heard about any Controllers that has been banned.
    I have heard about racers wanting Controllers to be testet because they fear that some Controllers might raise the track-voltage, and...
  6. That should work. You just have to make sure...

    That should work.
    You just have to make sure that you switch it on properly.

    Steen
  7. Larry, The resistance of the typical power-FET...

    Larry,
    The resistance of the typical power-FET will increase by 50% when the temperature of the junction is increasing from 25 degreeC to 125 degreeC. Heat is the main enemy of FET's.

    Mike, ...
  8. Mike, FET's can certainly be better than relays,...

    Mike,
    FET's can certainly be better than relays, but you have to be carefull about which FET's you choose. The right fet's wiil be cheaper than the best relays and will give much better performance...
  9. Hi Don, As a mock-up that will prove the...

    Hi Don,

    As a mock-up that will prove the concept your prototype is absolutely fine. In the real world the IRF630's will not survive, even if you have 2 in parallel, given that you will use a...
  10. Sorry, I misread the drawing (maybe because of...

    Sorry, I misread the drawing (maybe because of the resistor, which really ought to go from gate to source in order t6o be sure that the FET switches of).

    Steen
  11. Why are you suggesting P-FET's? N-FET's has less...

    Why are you suggesting P-FET's? N-FET's has less resistance and can handle more current.

    What is the purpose of the diode? Virtually all power FET's today has a body-diode that is able to carry as...
  12. Hi Larry, I am sorry, but some of your...

    Hi Larry,

    I am sorry, but some of your information is seriously out of date. The current capabilties of modern FET's, even relatively small TO220-types, far surpasses the current capabilities of...
  13. When it Comes to switching power on and off on a...

    When it Comes to switching power on and off on a track I have been thinking about using FET's for several years.
    I think that it's a good idea. FET's will last a lot longer than relays, and modern...
  14. I am using FET's in my Controllers. In CS-2's...

    I am using FET's in my Controllers.
    In CS-2's and CS-4's the FET's in the power-section are able to handle more than 250A at a case temperature of 100degrees C, and more than 350A when cold. In...
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    To me it seems that nobody have tried to make...

    To me it seems that nobody have tried to make measurements that could document the results of the efforts made.

    We hear a lot about large batteries or power supplies, a lot about heavy wiring and...
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    Allthough many believe it this is NOT about power...

    Allthough many believe it this is NOT about power supplies alone.
    Many tranck have power supplies (or one power supply) that is bit enough, but most forget that the wiring under the track can make...
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    Casey, this type of choke (4 coils, 4 relays...

    Casey,
    this type of choke (4 coils, 4 relays and an expensive, but small switch) is quite fine for so few components. You should be aware, though, that if you at some time will need all the power...
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    Hi Casey, I am looking at a 30A/12V relay...

    Hi Casey,

    I am looking at a 30A/12V relay right now. It's produced by the german company Hella, and the product number is 4RA 003 510-08. It don't know which brand of cars it used for, but I...
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    Hi Casey, I don't know more thasn you do....

    Hi Casey,

    I don't know more thasn you do. It's says Finder Type 40.01, but I guess that if you are looking for a 12V/20 or 30 or 40A relay you would be able to find something similar, both with...
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    Hi Casey, this is good to hear. Fact is...

    Hi Casey,

    this is good to hear.

    Fact is that we are really concerned about the linear operation of the transistors, which is making the operation of the controller more predictable when the...
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    Hi Casey, There is a significant reason why...

    Hi Casey,

    There is a significant reason why Petr Krcil choese to use 2 transistors. It is that no matter which of the suggested transistor you use 2 transistors will have a greater current gain...
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    Hi Casey, Well, well.well. As I have...

    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.
    ...
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    Hi Greg, It might be that you are right: some...

    Hi Greg,

    It might be that you are right: some racers might prefer a couple of "dead-bands" going into the corners.

    On my controllers I had dead-bands as much as 8 years ago. With most cars...
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    Well, people can have all sorts of reasons to...

    Well, people can have all sorts of reasons to prefer one type of controller against another type.
    Habit is no doubt very important, taste can be another reason.

    I also believe that racers are...
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    Well, that changes the power in the first...

    Well, that changes the power in the first resistors to 10W or 0.6W, which is somewhat less risky.
    But that doesn't Change the Overall conclusion, now that the resistors are burning: Change to some...
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