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Type: Posts; User: KlausST

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  1. Closed: Re: Radiated susceptibility problem-PWM dimming

    Hi,

    I don´t think that induced signals are likely to cause low frequency flicker.
    Without schematic and/or more detailed inflormations about the circuit, it´s function, it´s wiring... all we can...
  2. 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 don´t know them. So how can we help?

    Klaus
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    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
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    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...
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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
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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...
  7. 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...
  8. 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?
    ...
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    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...
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    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
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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
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    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
  13. Closed: Re: looking for a local supply in southern california

    Hi,


    Please notice that the forum members are spread all over the world with different experience, different ethnics and different ways of working.
    You must not expect that anybody knows what...
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    Closed: Re: Link between sampling and accuracy

    Hi,

    first of all it depends on the voltage value of one LSB.
    And this depends on the decoding range of your ADC. We don´t know this.
    For sure there is also a dependency on the ratio, if you are...
  15. Closed: Re: Circuit don't work in Microcap (555-based class-D)

    Hi,

    ... or use a ready to buy class D amplifier IC.

    Farnell lists about 30 different ICs below 1€. And they have good audio quality and power.


    Klaus
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    Closed: Re: SMD SOT23-6 Component Marking Code BR79

    Hi,

    What about digital pot / EPOT / EEPOT?

    Klaus
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    Closed: Re: SMD SOT23-6 Component Marking Code BR79

    Hi,

    upload a photo of the PCB, where we can see all the connections.

    You said you have a schematic, then upload it. Hand drawn is O.K.

    Tell us what the PCB is for.


    Klaus
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    Closed: Re: circuit with drive buffer

    Hi,

    With 5V logic supply, then 3.3V input signal is not HIGH.

    With CMOS logic (HC), valid high levels are 0.7V x Vcc = 0.7 x 5V = 3.5V.

    --> don't use 3.3V but use 5.0V as HIGH.

    And please...
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    Closed: Re: circuit with drive buffer

    Hi,

    I don't understand your textual explanation, nor do I understand what function you expect...

    But as soon as /OE are high then the output is disabled.
    Both /OE need to be LOW.

    ********...
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    Closed: Re: Offset / Gain interaction

    Hi,

    I didn't go through the complete circuit...

    For calibration:
    * Usually first the input is open or short circuit (zero input), then the offset is calibrated.
    * After that the gain gets...
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    Closed: Re: Calibrating the acceleration sensors

    Hi,

    usually the sensor manaufacturers provide informations on how to calibrate the sensors.
    Do a search on their internet site and/or contact them.

    And you first need to know what you want to...
  22. Closed: Re: Doing electronics on an office carpet (non ESD)

    Hi,

    ESD fails may be immedialtely but they may fail even after months.

    ESD fails do not necessarily cause a "no function" fail.
    With an OPAMP maybe the isolation barrier is weakened .....
  23. Closed: Re: Covergance Problem in Transient Bias Point Calculation

    Hi,

    The answer is already given in post#2.
    A closing "ideal" switch with two "ideal" capacitors gives "infinite" current at zero charging time.

    --> Neither "infinite current" nor "zero time"...
  24. [SOLVED]Closed: Re: PIC24FJ256GB210 Controlling Output Voltage

    Hi,

    Be sure you connected the negative DVM input to PIC_GND.
    Do verifying measurements to
    * VCC
    * LED (each pin)
    * resistor (each pin)

    And also be sure that that the PIC pin is steady (DC,...
  25. Closed: Re: Doing electronics on an office carpet (non ESD)

    Hi,

    If I remember right you already asked similar questions ....

    As long as the ESD voltage affects all device pins equally, there is no ESD problem.
    You get ESD problems as soon as ESD hits a...
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