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  1. Minder

    IRFZ24N and IRFZ44N

    In most applications it should work, the current rating is much higher for the 44. M.
  2. Minder

    Relation between pwm frequency and motor speed

    The reason for the term BLDC relates to the fact that the commutation style of powering only two winding's replicates a DC motor turned inside out as opposed to the 3ph type which apart from commutation methods are virtually identical.. I have both the Mechatronics, Stepper and DC, as well as...
  3. Minder

    Relation between pwm frequency and motor speed

    There is a subtle difference between 3ph P.M. motor and a BLDC, a BLDC only has two of the three windings energized at any one time. AS opposed to the 3ph which has a 3phase signal to all three. For details on PWM control of a BLDC motor there is the Picmicro DS51554B development board with...
  4. Minder

    Transistor Help

    +1 on the Mosfet. M.
  5. Minder

    Motor speed control

    Probably not, start and run cap motors do not control that well, even with a VFD, they tend to drop out of run at low speed and/or with load. The it most likely a Triac controller intended for Universal type motors or small shaded pole motors (fans). You can either swap the motor for a treadmill...
  6. Minder

    Fuse Values

    You could always start with a 1.5, if you get nuisance blowing then use the 1.6a. They are close anyway. M.
  7. Minder

    Electric motor needs start capacitor

    Usually the transport/pulley/driver mechanism, for e.g. on turntables the pulley is changed for different dia. They are synchronous motors so the motor runs at whatever the mains freq. is. M.
  8. Minder

    Multiple grounding points in car infotainment

    I have watched some of the video lectures by Dr Bruce Archambeault on the subject. M.
  9. Minder

    Multiple grounding points in car infotainment

    Very good article, a subject I have championed for a while, re the disregard for the correct symbols used for circuit commons etc. to quote: "All too often, this symbol appears on circuits that do not connect to the Earth at all" The book 'The Art Of Electronics' use the earth ground symbol it...
  10. Minder

    Programmable Microcontroller with relays

    Are there other functions that you need a μp for? If not, a couple of 555's or a 556 should do it. If you do use a micro then I would use a logic mosfet on the output of the μp to operate the relays or switch the load direct with the mosfet. Depending on the other requirements, a small 8 pin...
  11. Minder

    Varistor size?

    Snubber simpler? Unfortunately you cannot load very high files to this site so I could not show the design details. M.
  12. Minder

    How to control the voltage/current in resistive wires for heating?

    One simple way is with a SSR (solid State Relay). If you want to control temperature then a thermostat and thermal sensor is needed. Depending on temperature needed and the medium you are heating, will depend on the sensor type. For heating, burst method is used rather than phase angle control...
  13. Minder

    Training on motor control

    Microchip have a considerable number of APP notes on control of different motor technologies. They also have development boards for designing various methods, all with example S/W. Two examples is a DC motor and Stepper motor board called Mechatronics. Also a BLDC version for hall commutated...
  14. Minder

    Help With Signal Relay

    You do know it is a bi-polar relay? At least the No. you gave. M.
  15. Minder

    Anyone bought from "futurlec"? good source?

    I mostly use Digikey, but get my Vero strip board from them. Prototyping Boards M.
  16. Minder

    Help With Signal Relay

    Is it being retained off by the alternate polarity on the coil? M.
  17. Minder

    180V DC motor Board Questions..

    So if you say they are working what do you use to test, assuming you did not salvage the whole T.M. BTW not all T.M.s use PWM, there are a number that use 0-10v via a Pot. Although in this case I believe yours does, did you get the name of the T.M.? M.
  18. Minder

    filter AC component by a FAN from a DC circuit with a 1N4007 Diode

    Depends on the fan technology, most now are DC in to a BLDC controller so they do not generate to the supply due to the internal circuit isolation. Not really sure of your actual configuration? M.
  19. Minder

    Help Thyristor circuit

    What is the actual value of the gate resistor, normally it would be closer to 100Ω. Is the 9v source capable of supporting the full load, without a dip? M.
  20. Minder

    timed circuits with electromagnets

    Do you want variable rate? If using a PIC or Arduino, you could look at logic gate Mosfets, no base currents. M.
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