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  1. Alec_t

    help with IR2110 chips

    Inductance ratio for a 1:8 voltage step up ratio will be 1:64.
  2. Alec_t

    help with IR2110 chips

    The L2 and L3 windings are short-circuited in your schematic. The inductance of a transfomer winding varies as the square of the number of turns. So for a transformer with a 5.75:1 voltage ratio the inductance ratio of the windings will be 5.75^2:1 = 33.1:1. Do you know the winding inductances...
  3. Alec_t

    PWM on 12volt winch?

    It's above my pay-scale, with all those Amps. It will need serious engineering and possibly critical layout, taking onto account heat-sinking, back-emf and EMI.
  4. Alec_t

    help with IR2110 chips

    Yes.
  5. Alec_t

    PWM on 12volt winch?

    Its SCR is rated only 3A, not 200 !
  6. Alec_t

    help with IR2110 chips

    The resistors in my posted circuit have nominal values and are there only for the purpose of the simulation. The 1 Ohm represents inherent coil resistance and the 100 Ohm represents an arbitrary load resistance. Omit them in a real-world circuit.
  7. Alec_t

    PWM on 12volt winch?

    That's reasonable. But applying the same factor of 5, that means the OP would be looking to source one rated at 5 x 114A = 570A !
  8. Alec_t

    PWM on 12volt winch?

    Theoretical current draw at the rated output is 114A. Peak (start-up/stalled) current will be greater, probably a good bit greater. You'll need a hefty PWM controller! Also a good battery.
  9. Alec_t

    help with IR2110 chips

    That sounds right. If your meter (set to measure Volts) doesn't have a centre-zero then the needle will either hit (or stay at) the left end stop, or else it should move to the right a bit. Just ensure the same magnet polarity and the same approach direction are used for each coil in turn.
  10. Alec_t

    help with IR2110 chips

    I wasn't aware of the table knife trick. You'd be annoyed after half an hour if the blade turned out to be made of non-magnetic stainless steel . :)
  11. Alec_t

    help with IR2110 chips

    Easy to make a primitive one. Place a magnet (or magnetised needle) on a bit of polystyrene foam and float it in a cup of water. Or hang a magnetised needle on a cotton thread.
  12. Alec_t

    Wahl "Peanut" Electric Razor blown

    @Thehoovah Welcome to maker.pro. Did you notice the previous post was over 2 years ago?
  13. Alec_t

    help with IR2110 chips

    A magnetic compass would work instead of the Gaussmeter app that Bertus mentioned.
  14. Alec_t

    Help to identify/replace component

    How have you determined the current if the MOSFET is damaged?
  15. Alec_t

    help with IR2110 chips

    Do you have an analogue multimeter? The motion of the needle as you bring a magnet near a coil would give a clue as to winding polarity.
  16. Alec_t

    help with IR2110 chips

    As a N pole approaches a coil there will be one coil polarity. As the N pole moves away from the coil the coil polarity will reverse. Something like this.
  17. Alec_t

    help with IR2110 chips

    The coil polarity reverses as a magnet passes the coil.
  18. Alec_t

    help with IR2110 chips

    How about this?
  19. Alec_t

    help with IR2110 chips

    Sorry, I don't. But you've got LTspice, so a sim should tell you all you need to know.
  20. Alec_t

    help with IR2110 chips

    Sorry, you've completely lost me. Changing V2 to a negative voltage (is that what you want?) would prevent the circuit working.
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