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Recent content by vvsvv

  1. V

    what is the parasitical parameter of the AWG18 wire?

    thank you ----FvM. However, what I am considering is when the length of the "long wire" is 5000km, and when the signal frequency is 10k(for example). so the candactance and inductance of the twisted wire have to be considered . Could you give a more detail info ? Thanks again.
  2. V

    what is the parasitical parameter of the AWG18 wire?

    awg 18 wire During my design , I need to build up the long wire model which need the parasitical parameter (such as conductance ,resistoance, inductance,capacitance) of the AWG18 wire. however, I can not find it, who has it ? would you please share the data ? Many many thanks.
  3. V

    transformer design, howto

    Thank you very much.
  4. V

    transformer design, howto

    Any resources or PDFs is great helpful . i just need to finish a disign concerning flyback DC-DC . Thanks.
  5. V

    24V to 5V@2A Buck solution or Controller IC ,which is bette?

    5v 2a buck Requirement is "Cost" and "Efficient" . Here I select : LM25576 , MIC4576 , LT1766 .etc , However, could you tell me which one (or others) is more cheap and more efficient ? Thanks very much.
  6. V

    which MCU has better anti-vibrancy performance ? thx

    which MCU has better anti-vibrancy performance ? and which package has better anti-vibrancy ? Thanks.
  7. V

    Which is the best software for PCB design?

    best pcb doftware Expedition. Expedition. Expedition. better.
  8. V

    what is capacitive loads ?

    Thanks abaidullah,vijayanand_ME Thank you very much. The info is very helpful !!
  9. V

    what is capacitive loads ?

    what is capacitive loads ? what is inductive loads ? what is resistor loads ? Thanks.
  10. V

    when does BAV70_BAV56_BAV99 should be used ?

    I see. Thanks a lot !!!!
  11. V

    when does BAV70_BAV56_BAV99 should be used ?

    The datasheet tell me that BAV70 is a dual-diode , but why and when should use dual-diode ? If I can use IN4148 , why need to use BAV70 ?? THAT is the question. Thanks for your answer.
  12. V

    How to deal with 24v->3.3V LDO circuit?

    24v to 3.3v How to deal with 24v->3.3V LDO circuit? ------------------------ Goal : input : +24V~~+30V output: 3.3V , 80mA ------------------------ I plan to use "LM317" . If I input the 24V directly to LM317's input, then the efficiency is too low ( efficiency = Vout/vin = 3.3/24...
  13. V

    what is result if analog input of A/D is bigger than Vref?

    ok. The answer was just I thoutht to be . Thanks.
  14. V

    what is result if analog input of A/D is bigger than Vref?

    what is the output of MAX1036(ADC), if the analog input of ADC is bigger than its Vref? A/D is MAX1036 if analog input is 4.096V , then it will output "11111111" , Then if analog input is 4.5V , MAX1036 will output what ? "11111111" still ??? (Note :Vcc = 5.0V ) Thanks.
  15. V

    Can anybody tell me how to understand the following circuit

    So , If the vin = 40v , and the vbe1=vbe2=1v, then, Vyyy = 26-1-1 = 24 V ? why Vyyy ?= 40-Vce1-Vce2 ??? Thanks.
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