Type: Posts; User: FvM

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  1. Replies

    Closed: Re: priority on two asynch triggered events

    I agree with std_match, there's a potential simulation mismatch with this code, as discussed in previous Edaboard threads, e.g....
  2. Replies

    Closed: Re: DsPIC30f4011 erranta

    Errata sheets are displayed along with the product documentation at

    Typing "dspic30f4011 errata" at Google will probably answer your question.
  3. Closed: Re: Offline Flyback SMPS: Y2 capacitor from primary to secondary can be high value?

    Basically yes, unless you have significant capacitance between switching circuit nodes and earth ground.
  4. Closed: Re: Locking an MCU due to wrong fuses, fow to fix?

    Just a valid external oscillator frequency up to 20 MHz. Probably not too low, there's a required relation to serial programming SCK.
  5. Replies

    Closed: Re: TVS junction capacitance reverse voltage

    Don't know what "sinking current into" means. I guess you want to estimate the additional gate driver load caused by a TVS diode. For an exact calculation, you need to know the diode C/V...
  6. Closed: Re: Locking an MCU due to wrong fuses, fow to fix?

    Reviewing the documentation, I realized that disabling serial programming (SPIEN fuse) is not possible over serial programming, only over JTAG or parallel. Means you have not totally locked out...
  7. Replies

    Closed: Re: Opamp circuit simulation

    Decide about the amplifier configuration (e.g. noninverting buffer), input voltage range (e.g. 0.5..1.5V), settling performance (e.g. to 0.1 % of final value). Apply the input signal, plot...
  8. Closed: Re: Locking an MCU due to wrong fuses, fow to fix?

    A well known problem. Once you have disabled serial and JTAG programming, parallel programming is the only way to reset the fuses. See datasheet section 25.6 Parallel Programming.
  9. Closed: Re: Conducted emissions: Noise current limit for house hold appliances.

    I didn't look for CISPR 15, because it's not strictly applicable here, but it has the first general conducted emission limit values downto 9 kHz. Thanks for mentioning.
  10. Replies

    Closed: Re: C programming problem

    Although your code is legal C, you should also try
  11. Closed: Re: Conducted emissions: Noise current limit for house hold appliances.

    CISPR 22 is the generally applicable standard for frequencies above 150 kHz. There are some attempts to extend the limit values down to 9 kHz with rising magnitude, but no agreed standard yet. CISPR...
  12. Closed: Re: How to read incremental rotary (quadrature) encoder?

    How about using RB4 to RB7 interrupt on change function?

    Key detection needs only moderate scan rate, it's very unusual to use interrupt for it. Incremental decoder depends on the application,...
  13. Replies

    Closed: Re: RF IQ Quadrature modulator

    To fully utilize the I/Q modulator capabilities, you need a dual channel arbitrary waveform generator. Adjust the amplitudes and DC offset according to the modulator specification, that's all.
  14. Closed: Re: How to read incremental rotary (quadrature) encoder?

    You have a serious confusion with RB1_bit and EncoderA_bit respectively RB2_bit and EncoderB_bit. Encoderxx is defined as alias of the RBx, but should be a variable holding the previous input state....
  15. Replies

    Closed: Re: Flyback converter design for 250V

    So why you are designing a 20W converter?
  16. Replies

    Closed: Re: ZCU111 Ultrascale+ RFSoC board

    The reference clock connector won't output 10 MHz without appropriate PLL programming. Sure everything is setup correctly?
  17. Replies

    Closed: Re: Flyback converter design for 250V

    Designing the converter for 250V*80 mA continuous power is a bad idea, I think. For safety reasons, it shouldn't provide more than the required average power and utilize capacitive energy storage for...
  18. Closed: Re: ADA4870 as a small linear amplifier with single ended VCC?

    Simple calculation, maximum output swing for bipolar supply is +/- (Vs - 2V). Calculate undistorted Vrms, output power. Maximum output into 50 ohm is about 3.5 W with +/- 20V. Single supply +12V...
  19. Closed: Re: Offline SMPS EMC scans: Why are "common mode only" scans so expensive?

    It's of course possible. You can use a matched resistive power divider/combiner to derive CM, and a balun or a 180°-coupler to extract DM. You should consider that the LISN isn't designed to get...
  20. Replies

    Closed: Re: [Verilog] Asynchronous Reset

    Yes, it's the required template for synchronous registers with asynchronous reset, understood by all synthesis tools. Interpreting the code line by line like a simulator shouldn't contradict the...
  21. Replies

    Closed: Re: 8051 seriel data transfer

    It's C programming, you can use C compiler features. I'm using printf() with hex format in this situation.
  22. Replies

    Closed: Re: Multi. Microcontroller design

    Why not use an industry standard protocol, e.g. MODBUS RTU?
  23. Closed: Re: Conversion from LTSpice to Spice Model Files for Altium Designer

    What kind of models are talking about? Ltspice models can be either generic SPICE, usable without problems. Or binary encrypted models as shipped by Linear, they can't be used in any other simulation...
  24. [SOLVED]Closed: Re: Can't find Tg parameter for Roger RT6002 and RT6035HTC

    Do they have Tg? If at all, it's probably > 300 °C.
  25. Closed: Re: Common mode noise reduction by connecting ferrite SMPS core to ground?

    treez has been discussing a lot about about interwinding shields, I presume he knows the difference. The question is definitely not about interwinding shield.
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