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Recent content by yaghoubi

  1. Y

    problem with LM317(Current limitter)

    hello again I have another question about LM317. I want to use 18 pieces LM317 on one heat-sink in current regulator mode (actually outputs will be shorted ). Is there any problem with that?if yes why?
  2. Y

    problem with LM317(Current limitter)

    hello again I found the problem(I had connected LEDs to out put pin of LM317 and it is causes the resistor not be on the rout) but as I had said about the current difference between LED and circuit; see attached file(It is because of poor multimeter) but now there is another problem: LM317...
  3. Y

    Altium "Minimum solder mask sliver constraint violation"

    I think it is not a serious problem just adjust the rules.maybe the default rule( is more than 0.047mm) and it makes problem
  4. Y

    Altium PCB Component pads

    if there is a component and you want to remove some pads there are several ways: 1)go to [B]schematic library of the component and remove pads you want to remove 2)after double click on pads you want to remove,alter the hole size and X-Y of the pads to zero 3)after double click on pad you can...
  5. Y

    hexadecimal machine code to c program code converter

    here is some links: https://www.keil.com/forum/13622/ https://www.edaboard.com/threads/105271/ https://www.microchip.com/forums/m116413-print.aspx
  6. Y

    Problem on Pspice simulation for an inverter ( newbie here)

    power loss for MOSFET = Rds *Ids*Ids and it shouldn't be more than PD(for IRF540 is 130W).
  7. Y

    problem with LM317(Current limitter)

    I use a power source for circuit(and I can see the current which the circuit sinks). then I use a multimeter to measure the LEDs current. maybe the multimeter doesn't have enough precise and accuracy(next time I will measure both with one device and say result). I didn't measure the Vref of...
  8. Y

    problem with LM317(Current limitter)

    hello there are 6 power LEDs in series and 24vdc power supply.I used the attached circuit but the current is not constant(when the LEDs get warm , the current increases) [when I increase power supply in 20VDC the circuit sinks 370ma and the LEDs sink 350ma[after one minute the leds sink...
  9. Y

    power LED on 220v ac or 110v ac (by using rectifier )

    could you please write the formula?(how it can be calculated?)
  10. Y

    power LED on 220v ac or 110v ac (by using rectifier )

    hello I want to make a circuit similar to attached circuit.(30 led 1W in series) Is the circuit before bridge necessary?and how it could be useful?(how it is works?)
  11. Y

    How can "package thermal data (e.g. 19°C/W)" be used in calculation?

    hello In any datasheet for ICs, there is some information about thermal calculation(θJB=3°C/W , θJA=19°C/W). What is the meaning of °C/W?which range is better lower or upper?
  12. Y

    LED light circuit design (high power)

    Hello again I have several question.I was wondering if you help me. 1) Has a 84 watt led light enough brightness(to compare with 250W halogen) ? 2) Is it practical to use a transformer(220v to 110v) and rectifier then use TL783 and drive 14 LED in series?(see attach) [do you have another idea?]...
  13. Y

    LED light circuit design (high power)

    I think it's better to use 48VDC as power supply. according to my searches ,buck topology is the best topology. see attached file
  14. Y

    [Moved]install WINCE on ARM(general question abaut create ARM board and install WIN)

    Could you please take some Learning subject here? thanks
  15. Y

    LED light circuit design (high power)

    thank you because of mentioning important points. I want to make a 120W LED street light.I searched several ICs that are suitable for this purpose (LM3402HV). let me know, is there any other way to make a 120W LED street light with below properties? * low power dissipation (high efficiency)...
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