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FPGA 5V TTL to control 9.5V 1A motor

Hi!

I have an assignment that I need some help with, I hope this is the right place for it.

I'm completely new to this kinda thing and I've spent about 4 whole days trying to figure this out.

The assignment reads:

Design a circuit that will let you control a engine that runs on 9.5V and 1A thru an output on an FPGA (Nios2DE) that leaves 5V 1mA TTL.

I have to build 4 of these on a budget of about $3.

I've figured as much as I need to use transistor(s) as a switch.

I've been doing some calulations, but I don't get it to add up.

Please help!

Thanks!

/Holly

Replies

  • gohm
    gohm
    Can you share your calculations for us to see?
  • Holly
    Holly
    That's the thing, I don't quite understand everything, so I'm not sure HOW to do the calculations. 😳

    These are the designs that I've come up with:

    [​IMG]

    In this case what I want is for the transistor to be fully saturated. This would be, if I can find a transistor that will be saturated with an Ib=1mA.
    The transistor should be able to handle a minimum of 1.5A.

    The more likely scenario, if I have understood that much, is this:

    [​IMG]

    Please help me figure this out! 😒

    Thanks!

    /Holly

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