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Type: Posts; User: Coper

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  1. Replies
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    Closed: Re: RF connected/destroyed Load detector?

    You're right, but
    - PA is designed to cope with full reflected power for some time
    - in terms of reflected power there is a SWR meter in the device that turns off the PA if the SWR exceeds 5
    Yet,...
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    Closed: RF connected/destroyed Load detector?

    Hello, I have RF PA which supplies the load that can be disconnected or destroyed and therefore the processor in the amplifier must recognize this in order to turn the amplifier off or not to turn it...
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    Closed: Re: Toroid Coil Design and Implementation

    for clarification.
    Clock source is pierce oscillator with one inverter from 74HC04 and other (5) inverter parallel is used as power driver of the circuits on the schematic that is, they are...
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    Closed: Toroid Coil Design and Implementation

    I would like to clarify a few things

    I have this circuits. Yes it si any RF PA with MOSFET.

    The first question how to calculate the size of the coil L2?
    Is this approach correct?
    L2 with Ciss...
  5. Closed: Re: STM32F3 + SPI Ethernet interface and Http server etc.

    Because I need a specific combination of analog peripherals and this is only in STM32F3 and in this line is not version with build in ethernet
    Last but not least I don't see much difference between...
  6. Closed: Mutual Inductance between two toroids Coils?

    I need to place two RF current transformers on the PCB.
    I wonder how far they have to be apart so that they don't interfere with each other

    More practically.
    From PCB to short coaxial any as...
  7. Closed: STM32F3 + SPI Ethernet interface and Http server etc.

    I have design with MCU STM32F373 a need add interface on Ethernet and internal Http server + DHCP Client and maybe SLIP Interface.
    I think I need some SPI to ethewrnet IC, for example W5500 and any...
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    Closed: Looking for any Display

    For a project that started out as a hobby but has a certain production potential I'm looking for a display.
    The machine typically belongs to a workbench.
    Max viewing distance of 1m, rather less...
  9. Closed: Re: Recommend simulation software for RF simulation

    You've convinced me, I'll try Microwave Office:|
    Maybe I'll bring him home today.
    Can you recommend where to find some examples of use?
    The basics Howto
    - simple design and optimalization LPF
    -...
  10. Closed: Re: Recommend simulation software for RF simulation

    I know I exist. ANSYS HFSS, CST Suite and ADS.
    I don't know much about ADS except that it's a 10GB package.
    About HFSS and CST I think, maybe wrong, I think it's complicated general sw using finite...
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    Closed: FERROCORE FR3 more information?

    Can anyone guess what the FR3 impedance will be at 10MHz?
    Datasheet is typically Chinese.
  12. Closed: Recommend simulation software for RF simulation

    What SW would you recommend for these cases

    1. DC power supply RF PA , for example 150W 3A 30MHz a we need propose of the fourth order LC filter between this.
    We are going to test it and see...
  13. Closed: SPI digital isolator adum41521 idle current consuption and replcement

    Because I need to measure the potential of the AC 230, i need isolator for SPI bus (total 7 I/O)
    My first choice is adum4152 or adum3152
    If I understand well have this IC idle current consumption...
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    Closed: SSR ZCC and PWM control?

    Is possible control SSR with integrates ZCC over PWM signal?

    On 50 Hz AC is 100 half wave, is possible over PWM realize control on half wave (0-100% 1% =one half wave) without synchronisation on...
  15. Closed: Re: Temperature to voltage or 1wite digital converter with high presicison?

    maybe
    or maybe I have 16bit ADC in design
    or maybe I design only PCB for sensor and do not solving other.
  16. Closed: Temperature to voltage or 1wite digital converter with high presicison?

    Hello,
    I search high precision (accuracy +-0,1C or better) temperature to voltage or temperature to 1wire digital converter with price max 1$.
    I find LMT70 but rel price on mouser is 2$ and china...
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    Closed: Re: Low cost amplifier for 12bit ADC SAR?

    In a way you are right, but
    my measurement is Ratiometric and this remove error of reference ,
    Yes no not remove error of ADC , but it's no reason to add more big error on buffer amplifier.
    I'm...
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    Closed: Re: Low cost amplifier for 12bit ADC SAR?

    OK
    I use internal ADC in STM32F373 with external reference (TL431).
    I use sampling gite 960ns or more.
    Already from the ADC used and the reference is clear, there is no extra accurate...
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    Closed: Low cost amplifier for 12bit ADC SAR?

    I have 1MSPS 12bit ADC SAR for measure voltage between 50mV - 2500mV. Because signal source have impedance about 100k ohm I have to use an amplifier as buffer.
    I use 2 MHz Zero-Drift Op Amps ...
  20. Closed: Re: Output inverter bridge for welding TIG machine?

    I played with a PCB layout and her is my first design in early alfa version.
    I remember, I do not want to produce it in big but in a few pieces
    Motherboiard is FR4 with 70um coper, on golden...
  21. Closed: Re: Output inverter bridge for welding TIG machine?

    For clarification. conductivity losses can be reduced by using a pair of transistors 8pcs in full bridge. The question is whether it is economic, because 57W is only 1,5% of total power.
    Cool the...
  22. Closed: Re: Output inverter bridge for welding TIG machine?

    In DC mode the bridge must be in "static state" and this eliminates a simple transformers MOSFET driver.
    May be I use full isolated digital driver with DC/DC PS.

    Yes max switching spoeed is...
  23. Closed: Output inverter bridge for welding TIG machine?

    I have TIG weding machne , but only DC and need AC for welding aluminium and pulse for any precise works.
    My idea is add on output full bridge for chnging polarity and or make pulse.

    Technical ...
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    Closed: Re: High speed MOSFET DRIVER?

    I need simple Low Side non isolated driver.
    In terms of current, anything above 1.2A will pass.
    I did a practical exam with what I had at hand.:laugh:
    As clock source i use any fluke generator...
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    Closed: High speed MOSFET DRIVER?

    I have this problem,

    Have CMOS output 3.3V , V0<0.4V V1>2.9V Rise/Fal<4ns , speed is responding 12MHz clock max load capacitance 15pF

    and need drive MOSFET , It is charge 200pF, 9nC ,on min...
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