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  1. Minder

    Controlling a simple DC brushed motor by PWM

    What make of PLC? If you already have a PWM signal output then feed it into a suitable power Mosfet, add suitable supply for the motor. M.
  2. Minder

    Milwaukee Drill RPM Limiting Circuit 0-850 RPM to 0-475 RPM

    I doubt it is "This is a single-phase AC induction motor, " They are usually Universal motors (AC/DC). .If a SCR is used then most likely there is a bridge rectifier in there somewhere otherwise it would be running half wave. M.
  3. Minder

    How does a multimeter's continuity function work?

    Most high end meters, Fluke etc, have very low current capability on the resistance range and cannot test a diode unless they are directly shorted, as they do not have the current capability to forward bias the diode or semi. So the diode range actually passes a current through a diode or...
  4. Minder

    Help me design a water heater circuit that automatically turns-off when the heater reaches a boiling

    Use a SSR to control the immersion htr and a thermostat in the low voltage side. Alternatively you could use a relay in place of the SSR. M.
  5. Minder

    DOOR BUZZER THAT CALLS A SPECIFIC NUMBER

    How many digits per member is used? A μp resolution would be fairly simple, how is your electronics? M.
  6. Minder

    How to make a mains detection unit using an optocoupler

    Alot will depend on the nature of the detection required? Simply the presence or not, or zero crossing or random phase etc. M.
  7. Minder

    How to make a mains detection unit using an optocoupler

    Also check out Fairchild App note AN3006 and Microchip AN958. M.
  8. Minder

    Transformer - Number of turns?

    For adding an overwind etc you can't beat a Toroidal type, To find out the T/volt wind on a small number of turns, say 10, power and measure the voltage and it can be calculated from there. If reducing one, measure, take 10 turns off and re-measure. M.
  9. Minder

    Transformer - Number of turns?

    Over the years I have rewound or added secondaries to many sizes of transformers, both EI and toriodal types, in some cases removing the EI lamination's and rewiring the bobbin. For EI I have found them to be between 2.5 and 4.5 turns/volt. Toroidal are a tad lower at 1.5 to 2 turns/volt. These...
  10. Minder

    Thourough and systematic information about safety in dealing with measurement equipment

    Another thing I did on my work bench was to fit power outlets along the front edge of the bench to avoid cords all across the bench as much as possible. Check to see if multi sockets strips are available where you are. M.
  11. Minder

    can someone please help with this maths calculation for torque?

    2v over the rated voltage is trivial and should not cause any problem, RPM is rated to voltage, so if it is exceeded by a greater amount it could cause overspeeding. M.
  12. Minder

    Thourough and systematic information about safety in dealing with measurement equipment

    One of the things that is usually required is a mains isolation transformer, if the electrical service in Italy is the same as many other parts of the world, the Ground conductor is referenced to one of the supply conductors, in order to create a Neutral. The danger comes when using an...
  13. Minder

    can someone please help with this maths calculation for torque?

    Most motor come with a torque chart and usually show continuous torque and peak torque. Continuous torque is usually maximum from 0 rpm and stays fairly flay up to the rated rpm. Peak torque (current) should only be experienced for a brief time, otherwise motor burn out can ensue. Your motor...
  14. Minder

    Im new to assembly language and microcontroller

    Use Tutorial #2 and #10 for both P.B. and dual 7 seg display. You just have to merge the two for your project. I have never used the 12f84 so there could be a couple of small differences. M.
  15. Minder

    Gerber files

    I use the free Kicad S/W there is a learning curve but there is many tutorials out there some Kicad, others 3rd party. There is a new cheap site for PCT's https://www.seeedstudio.com/fusion_pcb.html?gclid=CK_FlqTe1tICFcO3wAodI5IJFw $10 for qty 10 10cmx10cm. Also Dirty PCB have a deal on for...
  16. Minder

    struggling self learner

    Some of the ones that I always found useful was the SAMS books, one book was usually dedicated to a particular subject, A good source of new or nearly new books at a good price is Abe's Clearing house. M.
  17. Minder

    How to create a magnetizer

    Google SCR to find details, it is an electronic switch, that once turned on remains on until voltage has collapsed. IOW it dumps the charge in one shot. M.
  18. Minder

    Im new to assembly language and microcontroller

    Google the assembly tutorials on http://www.winpicprog.co.uk/pic_tutorial.htm site. You should be able to easily modify one to suit. M.
  19. Minder

    Control Circuit for a ( Linear motion ) Motor

    Then a simple joystick would work, you need a reversing relay unless the J.S. has enough contacts. M.
  20. Minder

    Control Circuit for a ( Linear motion ) Motor

    Would you not need gradual action, rather than full on/off? M.
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