About

My name is Arvid Mortensen. This is my little space on the www for sharing my projects and stuff. I live in Norway near Bergen.

To contact me, leave a comment on one of the pages or email me at: arvid@lamja.com

4 Responses to About

  1. Jericho says:

    Hi Arvid!
    I just came across your stepper motor driver. I liked your design cause its all in discrete components! Chips are not so cheap where I live, and I’ve got a lot of transistors at home so I’m stuck with them. Do you have some schematics using only BJT’s? Thanks and nice work

    • arvid says:

      Hi. Thanks for the comment. I’m not that good at transistor design. I use LTSpice to simulate the schematics. I suppose it’s possible to use BJT, but you may need to change the driver stage that is now designed for the FET’s.

  2. Jericho says:

    Hi ArviD!
    I was inspired with you design of the controller for the bipolar stepper. I’m somewhat confused with the output current waveform. How did it became a discrete sinewave? Is it because of a DAC? Thanks Again.

    • arvid says:

      Hi.
      Yes it’s because of the DAC. What you see is the current flow in one winding in the motor. (Or voltage across a load resistor to the motor.)

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