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Type: Posts; User: KlausST

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  1. Replies
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    219

    Closed: Re: Half Bridge IR2153 Mosfet death

    Hi,

    10 Ohms vs 100Ohms.
    I personally like fast switching and thus rather 10 Ohms.

    But as already mentioned, faster switching needs a more elaborated schematic, part selection and PCB layout.
    ...
  2. Replies
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    Closed: Re: My PCB and Commercial PCB Comparison

    Hi,

    If your circuit works, then everything is O.K. No need to worry.

    1) green vs brown tracks.
    It does not matter. Maybe one is tin plated the other is pure copper.

    2) solder mask on vias...
  3. Replies
    6
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    219

    Closed: Re: Half Bridge IR2153 Mosfet death

    Hi,

    This sounds like a PCB layout problem.
    Maybe a schematic problem.

    Please: no textual description of a circuit ... schematics are way more informative and can be understood worldwide.
    ...
  4. Replies
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    Closed: Re: Current Density PCB track

    Hi,



    This is correct: more area --> more power to dissipate

    But the ratio will be less.

    Imagine:
    An area of 1cm x 1cm ... letīs imagine it can dissipate 1W...
  5. Replies
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    301

    Closed: Re: How "repair" voltmeter gauge?

    Hi,

    I had something completely different in mind...

    Now I see itīs a VDO brand.

    On an internet search I came to the VDO web shop.
    There you may find documents and also replacement parts....
  6. Closed: Re: Figure out the dimensions for this circuit button for mouse

    Hi,

    Then use a caliper gauge. If you don't have one, ask your neighbour or a mechanic.

    You may also do a google search for pictures. From the pictures (and the informations on their internet...
  7. Closed: Re: Figure out the dimensions for this circuit button for mouse

    Hi,

    It seems I don't understand the question..

    If I wanted to know the dimension of a part I'd use a ruler ... or any other measurement device.

    Klaus
  8. Replies
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    301

    Closed: Re: How "repair" voltmeter gauge?

    Hi,



    we live in the 2020ies where every simple cellular phone has a camera, most laptops, tablets...


    It really makes it hard to help without good informations.

    Klaus
  9. Closed: Re: Radiated susceptibility problem-PWM dimming

    Hi,


    This is a complete new situation.

    Then itīs quite possible that itīs just an interference between camera_sampling and PWM.

    Not even sure if itīs an error at all.

    Klaus
  10. Replies
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    Closed: Re: PWM Ramp Voltage of SG3525

    Hi,

    Do you mean an internal signal?
    Or a signal on a pin? Which pin? (Use the number or the name as in the datasheet.)

    Klaus
  11. Replies
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    Closed: Re: Inputs on my first PCB for AC motor driver.

    Hi,

    looks good.
    Good luck.

    Keep us informed.

    Klaus
  12. Replies
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    661

    Closed: Re: High side mosfet driver blows up. help :)

    Hi,


    Tell me whatīs the new undershot with the new PCB layout. I bet itīs much better now. (But do a reference measurement not to see false undershot)

    ****
    Current measurement:
    First you...
  13. Closed: Re: Radiated susceptibility problem-PWM dimming

    Hi,

    A lot of guessing is already done...

    Flicker frequency usually is in the range below 20 or 25Hz. Everything above is considered not to flicker. (But maybe a combination of two higher...
  14. Closed: Re: Radiated susceptibility problem-PWM dimming

    Hi,

    I donīt think that induced signals are likely to cause low frequency flicker.
    Without schematic and/or more detailed inflormations about the circuit, itīs function, itīs wiring... all we can...
  15. Closed: Re: Guitar effects circuit and noise from timing I.C's

    Hi,

    Either your schematic is worng or your PCB layout is not suitable.

    We donīt know them. So how can we help?

    Klaus
  16. Replies
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    306

    Closed: Re: Vin 18V-32V Vout 24V-what can I use?

    Hi,


    No. Nothing simpler than a ready to buy 1-part solution. Like TRACO TEC 2-2415.

    Klaus
  17. Replies
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    661

    Closed: Re: High side mosfet driver blows up. help :)

    Hi,

    I missed to say: the current PCB layout is much better than before. But could be better.

    I see no need for a split GND plane with your circuit. Split GND planes are good where noisy ground...
  18. Replies
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    Closed: Re: Localizing acoustic noise source on PCB

    Hi,


    Yes. I think mine had a bit wider diameter. Don't try to put it inside your ear, don't hurt yourself.

    Not only inductors cause noise. Check the ceramics capacitors, too.

    Klaus
  19. Replies
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    Closed: Re: Vin 18V-32V Vout 24V-what can I use?

    Hi,

    Every switch mode IC manufacturer provides selection guides to find the correct IC for your application.
    Be sure the ICs does the job as desired...and as specified in the datasheet.

    You...
  20. Closed: Re: Why is it necessary to disable interrupts when loading transmit data into transmi

    Hi,

    It depend on
    * how the data buffers are organized in software
    * and how the the microcontroller (periferal) handles the data transfer.

    A think it's a good idea to post the UART interface...
  21. Closed: Re: Radiated susceptibility problem-PWM dimming

    Hi,


    I don't see why an optocoupler should create that much low frequecy noise that one even can see it.

    I rather like the idea about motorboating.
    Is the PWM control feedbacked somehow?
    ...
  22. Replies
    14
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    661

    Closed: Re: High side mosfet driver blows up. help :)

    Hi,

    Please post a link to the document that describes this "splitting the ground".

    I don't think it's a good idea.
    The short, but high peak current you send the the gate ... needs an equally...
  23. Replies
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    308

    Closed: Re: Mini SCART TV, does it exist?

    Hi,

    you want it for video only or audio, too?

    SCART supports various video interfaces, which one do you want to use?


    Klaus
  24. Replies
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    Closed: Re: Mini SCART TV, does it exist?

    Hi,

    the smallest TFT I found is
    MAJESTIC TVD-215 TV LED 15"

    Amazn says it has SCART input.

    Klaus
  25. Replies
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    320

    Closed: Re: Localizing acoustic noise source on PCB

    Hi,

    several times I used a small flexible plastics tube.
    One end close to the ear, the other end for scanning the PCB.


    Klaus
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