Recent content by TarHeelTom

  1. TarHeelTom

    Detecting direction of rotation

    Maybe so. But this would involve some outside circuitry, such as a pair of HES transistors. I'm not really familiar with flip flops (except the ones in the shower), and have watched a couple of short videos which didn't enlighten me. On the other hand, the 4966 is a four pin chip, giving me...
  2. TarHeelTom

    Detecting direction of rotation

    That TLE4966L appears to be just the ticket I'm looking for, and Mouser has them in stock. Thanks, Harald
  3. TarHeelTom

    Detecting direction of rotation

    Got a bunch of rotating parts, and need to do some automatic control work. So need to measure the direction of rotation and the rpm. First idea is to put a magnet(s) on the sprocket then mount two Hall effect sensors nearby, but close together. Need some sort of a circuit to determine which...
  4. TarHeelTom

    3-Phase VFD Supply Pre-Filter

    I'm running a Bridgeport vertical mill on a VFD and love it. Think it's a GE/Hitachi brand, bought surplus. About $120 for a 3HP VFD to drive a 2 HP motor. (They were out of the 2 HP version, so sent me a 3 HP for the same price.) The motor doesn't have much of an internal cooling fan, so...
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