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Type: Posts; User: fourtytwo

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  1. Closed: Re: Problem with PIC16F877A, infinite loop output voltage 0.6V

    Assuming your first bit of code is actually complete (unlike the second) I don't see you have enabled PORTD as outputs at any point so I am not surprised you cannot see any output BUT also measuring...
  2. Closed: Re: PIC18F based Motor Controller Design, Is it good?

    Hello, you have several problems there
    1/ The high side gate must be driven to Vgate + drain supply, you say 200V, an L293D cannot do that.
    2/ 4N37 or similar opto-couplers are very slow and will...
  3. [SOLVED]Closed: Re: Lenovo laptop problem during installing LINUX OS

    What Distro exactly are you using and what is the media, what is the model of laptop, how much memory, what sort of storage etc etc!!
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    Closed: Re: IR2110 simulation problem is pspice

    Your FET wiring is crazy and wrong!! I am not surprised with that awful symbol, is that what you get paying $$$$$ for Orcad ?
    If I were you I would use a free simulator with decent symbols like...
  5. Closed: Re: Looking for pcb manufacturers for large boards (31"x17"x0.286" 40 layers)

    Perhaps nobody thinks your serious, whats your budget & MOQ ?
  6. Closed: Re: How can i chose the resistor value to simulate a PV cell in ADS

    I wish you had posted that model originally then we would have had a clearer idea what your problem was. FYI here is my standard spice model I use.
    152383
    As you can see Rser is tiny as I explained...
  7. Closed: Re: How can i chose the resistor value to simulate a PV cell in ADS

    Unfortunately I have no knowledge of the model you are using so I cannot directly answer your question.
    In my case in spice most published models I am aware of use a diode shunting a current source...
  8. Closed: Re: How can i chose the resistor value to simulate a PV cell in ADS

    Hello Brad, well let me help you out there, the correct way to model a PV cell is as a CURRENT source in parallel with a forward biased diode who's characteristics (conduction knee) mimics your cell....
  9. Closed: Re: How can i chose the resistor value to simulate a PV cell in ADS

    This may be to late! Rs can be calculated from the voltage drop from VOC to VMPP divided by IMPP that are all normally quoted both for panels and cells. Rsh (shunt ?) in the forward sense is...
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    Closed: Re: Round Robin gate-level diagram

    I don't see that schematic in the link you have given. I somehow think this is an incomplete schematic, what ensures only one grant is given ?
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    Closed: Re: Power transformer monitoring device

    Hi I read this thread with interest and I guess total non-invasiveness is a requirement (no opening up the transformer).

    For load estimation I would go for temperature rise using two sensors one...
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    [SOLVED]Closed: Re: IRS2110 IRS2113 SD pin and Rattlesnakes

    Not receiving replies from people who cannot be bothered to read the post would be even better!
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    [SOLVED]Closed: Re: IRS2110 IRS2113 SD pin and Rattlesnakes

    Thank you FvM and I shall certainly not make that mistake again! It is a double sided board with no copper fills in the area just ordinary tracks, it is a 14 pin dip package with normal sized pads...
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    Closed: Re: Problem with IR2113 full-bridge

    Hello I also use this chip, a couple of comments on your schematic
    1/ You show no decoupling on VCC and VSS pins, they are essential
    2/ You do not mention the diode type, the boost diode is...
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    [SOLVED]Closed: Re: IRS2110 IRS2113 SD pin and Rattlesnakes

    Sorry Klaus I don't give away schematics easily and they don't contain anything that is not in the apps note for the purposes of this particular problem. I should mention the driver is within 30mm of...
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    [SOLVED]Closed: Re: IRS2110 IRS2113 SD pin and Rattlesnakes

    Dear me I was only trying to help other people using this chip in an amusing fashion, if all your going to do is jump down my throat I wont bother again.

    PS I already know what the problem is!
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    [SOLVED]Closed: Re: IRS2110 IRS2113 SD pin and Rattlesnakes

    Umm it's a half bridge and the IRS211x is documented in the data sheet.
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    [SOLVED]Closed: IRS2110 IRS2113 SD pin and Rattlesnakes

    My wife kept saying my malfunctioning circuit sounded like a rattlesnake, well her hearing is a might higher pitched than mine but sure enough the main transformer of my half bridge kept saturating,...
  19. Closed: Re: Why is the European mains voltage so well regulated?

    It is actually surprisingly true, each set is a pump/generator and when in standby there is no water in the turbine, forced up the tailrace tunnel by air pressure and the motor is connected to the...
  20. Closed: Re: Can I protect VDS of MOSFET with TVS diode ?

    You should not need any additional protection at the individual mosfet level as in an H-bridge the motor back EMF will re-circulate via the embedded mosfet diodes. Of course this can cause...
  21. Closed: Re: Why do semiconductor companies not provide their datasheets publicly?

    They will also not do business with anybody with usages less then ~25Kpa as I discovered when evaluating there products for use in a radio communications base station on behalf of a reasonably...
  22. Closed: Re: Why do semiconductor companies not provide their datasheets publicly?

    You have unfortunately chosen one of the most customer unfriendly companies I have ever encountered! My advice to you is what I came to practice and that is ignore there SOC products and go elsewhere...
  23. Closed: Re: Why do semiconductor companies not provide their datasheets publicly?

    Whilst I agree with your sentiment no company rep is going to waste time on someone with no commercial intent.
  24. Closed: Re: TO247 FET mounted in "SMD" fashion and pressurized against heatsink with "foam"

    I assume by small rectangaloid you mean the TO247, why use convoluted language ?

    So back to the real questions, do you know the thermal resistance of your main heatsink/case ?

    Do you know the...
  25. Closed: Re: TO247 FET mounted in "SMD" fashion and pressurized against heatsink with "foam"

    If you stated the power dissipation, thermal resistance of your heatsink and max Ta that would be helpful as it would be possible to calculate the allowable interface thermal resistance. Is the...
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