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  1. Replies
    30
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    1,764

    Closed: Re: Single conductor inside hollow conductor

    so you have made a 1:1 transformer - well done ...!
  2. Closed: Re: Extracting energy from gyroscope precession

    No contradiction at all - I realise there is friction in a real system that assists starting ... I suggest a primer in logic ... the bend angle assists imparting momentum ONCE you have...
  3. Closed: Re: Do XR7 250Vdc 1206 SMD capacitors exist

    they are not X7R - " fool me once, shame on you - fool me twice shame on me..." goes the old saying

    i.e. try not to believe everything you read on a site that is trying to sell you...
  4. Closed: Re: Extracting energy from gyroscope precession

    the bend angle in the chain does indeed help establish motion - have you ever thought how one is able to start a swing from zero motion - without friction .?

    it should be clear to even a...
  5. Closed: Re: Extracting energy from gyroscope precession

    Dear precision99, apart from bare assertion - can you offer proof that friction does not assist in getting a swing started - ...?
  6. Replies
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    747

    Closed: Re: Cheap Mains harmonics tester

    it all depends on how much averaging of each harmonic the meter has to do - if the system under test has a steady state then yes a picoscope FFT will do - if the load is pulsating or time...
  7. Closed: Re: Extracting energy from gyroscope precession

    it's not built up from nothing - the friction in the system allows the swing user to impart momentum ... and therefore build up the swing oscillation ...
  8. Closed: Re: PS with LM76003 for variable volatage and variable current design?

    lots of input capacitance is necessary to make it stable ...
  9. Closed: Re: Extracting energy from gyroscope precession

    please point me to the frictionless bearings and the part where anything spinning in air has no frictional losses .... my credit card is ready ...
  10. Closed: Re: Extracting energy from gyroscope precession

    as you try to turn the axis of the bike wheel you encounter an opposing force against which you push - this is transferred through your body to the chair - allowing the rotation of the chair to be...
  11. Replies
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    742

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    a really good look around your circuit would have saved you a lot of time I'm thinking ...
  12. Closed: Re: Protecting SMPS against mains transients.

    do you have any CM chokes with measured leakage L on the input ...? and of a certain resistance ...?
  13. Replies
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    195

    Closed: Re: Li-ion Battery charger need help

    Hello Maxim, there is a curve for 1C charging in the data sheet - but really 1/5 C to 1/3 C is a better charging maximum, i.e. 5/3 amps for a 3 hour re-charge ...
  14. Closed: Re: Transformer primary current in GreatScott videp

    His explanation is bollocks - more likely he did the calc wrong or measured Lpri wrong, or his gear cannot measure 143mA very well (most likely ) or the mains is very flat topped or a...
  15. Replies
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    742

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    You really need a scope with properly isolated inputs - to measure things in your circuit - having too many ground connections at the same or different points can make it very hard to measure...
  16. Closed: Re: Extracting energy from gyroscope precession

    Gyro scopes can be magnetically coupled to coils that can speed up or receive energy from the gyroscope - this approach is now widely used in industry - up to 100kW - a lot of effort is used to...
  17. Closed: Re: Protecting SMPS against mains transients.

    correct ...
  18. Closed: Re: To which standards must we conform for our electronics/electrical product?

    look up other IPL machines and whatever standards they say they conform to
  19. Replies
    26
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    742

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    you appear to have no caps across the DC bus ...
  20. Closed: Re: Extracting energy from gyroscope precession

    any precession will necessarily be slow ... (?) thus the ability to get energy from it is limited. One assumes you are not talking about the normal rotation ....
  21. Closed: Re: Micro controller affected by ripple from bldc motor

    larger turn on resistors usually a good place to start, 47E or larger ...
  22. Closed: Re: Protecting SMPS against mains transients.

    e.g. SMBJ120A x 4 on the HVDC
  23. Closed: Re: CCM boost PFC with reverse recovery management

    inrush startup SCR most likely ... turn off time of common scr = 10uS
  24. Closed: Re: Protecting SMPS against mains transients.

    1200 V according to data sheet - for a very short time ( the applied test pulse is very short ) - the volts at the bridge depend on the amount of C you have after the bridge and its ESR/ESL
    ...
  25. Closed: Re: Is it possible to make an IGBT to work at duty cycles up to 100%?

    That gate driver: the Semikron SKYPER 32R can be run at 100% on time for the upper IGBT, we have made many hysteretic controllers for 50kVA power stages where the upper devices ( and lower and...
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