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  1. Minder

    Help finding this board for a sliding gate motor

    That would appear to make it relatively easy to trouble shoot and repair if there is no power. A little reverse-engineering should help pin it down. What about the voltage regulator, any voltage in? any voltage out? It seems like much of it is descrete logic, if so, a small micro could have done...
  2. Minder

    Help finding this board for a sliding gate motor

    Seems a little fancy for a gate motor controller, what features does it have that makes it special? What is wrong with it? M.
  3. Minder

    Camera leveller

    It sound to me as though you are describing a slot opto? For future ref. I would think you would need a PID based servo system such as demonstrated in the PIC AN964 Pendulum App. I put one together a few years ago. There is the code in the app in assy and C. M.,
  4. Minder

    Electrical connection questions

    Do you have the pin out details of the unit that you are working on (assigned pins)? That is a standard MS connector. Generally when the connector is carrying the main power, a plug/socket is used with a pair of pins to take larger gauge wire. If you have to wire it up to a wall outlet you...
  5. Minder

    Latching Relays

    Google Free wheeling Diode. M.
  6. Minder

    Nostalgia

    I used to buy a portable radio kit that I built and sold to friends back in the 70's, Everything portable back then, was powered by a PP9. I just checked to see if they are still available...
  7. Minder

    Nostalgia

    Early transistors, the Mullard OC71 general purpose NPN that had black paint covering, if you needed a photo cell, just scratch the paint off! M.
  8. Minder

    110VAC hair clipper on 220VAC help please

    For a hair clipper you should be able to get a small adapter for 230v down to 120v. M.
  9. Minder

    Cheap 3-Axis Mills

    Generally one of the reasons they are 'Fragmented' is a Post Processor is usually required as all CNC machines are not created equal, depending on manuf. the post processor usually provides the serial or other transmission as well as formatting the CAM program for the particular machine it will...
  10. Minder

    Need Some Help With This Vfd

    The issue with 7 segment displays is they are OK if you just wish to display purely a digital number, but if needing letters then you have to get creative. Similar to commercial VFD's that use them and some of the instruction displayed are very cryptic. As mentioned already, if a new application...
  11. Minder

    Nostalgia

    Believe it or not, I have two CNC machines running under DOS, the still available out there, DOS 7.1, the 'unofficial' version. Just proof that you do not need a bloated program such as Windows to run CNC. One missing from the list is ZDOS, the Zenith-Heathkit version. M.
  12. Minder

    Mosfet driver ir2112 circuit high side is not working

    There is not alot of difference the ir2110 has a little better output drive current as well as being somewhat faster. M.
  13. Minder

    Mosfet driver ir2112 circuit high side is not working

    About 20c;) Tahmid's blog: Using the high-low side driver IR2110 - explanation and plenty of example circuits https://www.silabs.com/tools/Pages/bootstrap-calculator.aspx M.
  14. Minder

    Timer to trigger linear actuator

    Some come with built in limits, does this one? Also what is the motor current? Does this mean you need a real time clock? M.
  15. Minder

    Mosfet driver ir2112 circuit high side is not working

    Agree, you need the rest of the H bridge for results. M.
  16. Minder

    Electric Motor Start-up

    You have to measure each winding to ensure if they read the same or not, if there is a difference you would need to do as per Bluejets if they are the same reading, you can just take the live wire from gray to black. And switching can be done with a simple SPDT SW. There appears to be a thermal...
  17. Minder

    Generac generator output

    Generally modern appliances do not use the mains frequency anymore for time, it is done using a 32Khz Xtal. You could do some test as to its frequency if you have a 'scope, and also look at the wave form. 1 to 2 hrs/day is ALOT! M.
  18. Minder

    Electronic kart

    An AC induction motor rpm is controlled by the frequency of the supply, not voltage.. If using an automotive starter, you should look at the later type that uses a P.M. field, the old style is a series motor and operates in a runaway condition, it depends on a high load to control the rpm, this...
  19. Minder

    DC motor brush question

    No generally the opposite. Is this a series (field) wound starter or a P.M. field? M.
  20. Minder

    DC motor brush question

    Mica was an older material for separating segments, now material that wears with the comm is used. Armatures that have mica that are turned down or reconditioned have to be undercut with a fine hacksaw blade, it is fairly easy to make one from broken blade. If the brushes are kept from good...
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