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  1. Minder

    Light dimmer Capacitor help??

    It looks like a typical Triac dimmer, if so that is just a 240vac .1uf cap used for the phase angle timing circuit in the gate of the triac. If dead, it is most likely the Triac. M.
  2. Minder

    Transformers

    First is the 29v transformer at the AC secondary or at the DC level, as a 29vac transformer secondary will give you ~40vdc after rectification and smoothing. Secondly, does the 12v circuits require a regulated supply or are they a type of load that it is not really necessary such as a LED or...
  3. Minder

    Building a device from a schematic (Yet another work in progress)

    As well as post #3, There is also the coverage of Schematic capture programs such as my favorite, Kicad, free programs such as these allow the continuation on the produce to a PCCT board with files to send to one of the many board providers out there, if needed. Even if one uses it for a simple...
  4. Minder

    The Pursuit of Ground

    In N.A. the neutral is bonded to earth ground at the distribution transformer and also in the service panel, other jurisdictions do not allow bonding of the neutral locally in the service panel. Whether the neutral is bonded to earth at the panel should be of no consequence as the grounding...
  5. Minder

    The Pursuit of Ground

    When I practiced in the UK, the service company did not provide a earth ground conductor, if they did it could not be used as a ground, a local ground had to be set up via either a metalic water pipe or a ground rod, and the earth ground resistance had to be measure from the local ground back...
  6. Minder

    Lacking eletronic and mechanical knowledge (Student)

    The field you seem to be aiming for is now usually referred to as Mechatronics, it is the marriage of electronics and mechanics and covers such things as automation, motion control (servo etc) robotics etc. You need a good basic in Electronics such as R,C,L theory and some digital circuitry as...
  7. Minder

    I need a really small, really smooooth motor...

    A stepper exhibits some cogging. So does a BLDC at low rpm. A small DC brushed with a gear box would most likely be the smoothest.. M.
  8. Minder

    Inductive proximity switch?

    What diameter or area do you need to cover? For the most part it is not worth building one. M.
  9. Minder

    The Pursuit of Ground

    Also search for Dr Archambault /Archambeault-Ground-Myth.pdf M.
  10. Minder

    The Pursuit of Ground

    Are you looking for service (safety) ground or local system ground? Here all is revealed. M.
  11. Minder

    What type of switch is this and how does it work?

    Appears to be a coil used as an auto-transformer mode. M.
  12. Minder

    What type of switch is this and how does it work?

    Could be a type of relay that switches the different rpm coil in. M.
  13. Minder

    What component is this?

    What is the PTC designation, sometimes that offers a clue. M.
  14. Minder

    Working on a vintage fan - whole thing is electrified when plugged in. What am I doing wrong?

    To check insulation you need a special meter called a megger, this tests the actual insulation by applying a high voltage and recording the leakage resistance, if any. If he did not receive a shock it could be he was sufficiently isolated from earth ground or the leakage is at a small level...
  15. Minder

    Working on a vintage fan - whole thing is electrified when plugged in. What am I doing wrong?

    If there is a ground fault on it where you would receive a shock, the ground conductor avoids this, but if there is voltage present on the case the current (short circuit) will flow to ground instead of through you!. Usually blowing a fuse, if the leakage current is high enough. Modernizing it...
  16. Minder

    Working on a vintage fan - whole thing is electrified when plugged in. What am I doing wrong?

    It probably pre-dates the requirement for 2 wire appliances to be double insulated, and get away without using a ground. You should use a 3 conductor cord, and ground to the metalic case, but don't be surprised if it blows a fuse. It sounds as though regardless of how the original was wired and...
  17. Minder

    Working on a vintage fan - whole thing is electrified when plugged in. What am I doing wrong?

    It should not make any difference which way you connect the power cord except the ground wire should have continuity to the metal case and any metallic part that can be touched. Although technically the switch should be in the live conductor. The fan housing should be at ground, but not...
  18. Minder

    Help finding a suitable transformer

    50hp motor? I must have missed that meeting.o_O M.
  19. Minder

    Fuses, fuses...

    As well as the Type, Fast-blo, Slo-blo etc, there a several different characteristics to fuses. M.
  20. Minder

    HELP identifie rectifier values

    Should be OK, The rectifiers would normally be on the secondary so the voltage should be alot less than 120v. M.
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