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Fight

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Everything posted by Fight

  1. Hello KevinIV who are you Hero not a moderator but is a brilliant man and my friend
  2. Hello Hero and Audioguru how are u i sure that both are well ok next Hello Hero in other threat named "Switch mode power supply" you tell me that if you buy a 12V 200W smps then you add a circuit for making power supply 0-30 and 0-5A variale voltage and variable conatant current power supply. If i buy PC P-4 PSU then this psu use as a primary 12V 200W smps first tell me that How idea and how can add a circuit please if you have a spare time then send a diagram using IC (SG3524) beacause this IC is avail in our country easily.
  3. Hello Hero and Audioguru how are tou if i add a circuit that prevent short circuit then this problem solved or not
  4. Hello Hero and audioguru how r u where are you in these days since about 2 weeks i am waiting you please come on internet and solve my problem
  5. Ok Then please tell me that how change in circuit that solve my problem
  6. i am using different fixed resistors and these resistors control with realy's i am using about 3K resistor whose cove 32.5V Ok if i use this circuit for 0-18V then this is right or not as above quote this situation lm338 handle 15W if i use heat sink then this circuit ok or not please explain if i max current limit 5A then how increase wattage above 15W
  7. Hello hero and audioguru how are you my final power supply circuit diagram that attatch Fig 1 the 40V dc supply make using transformer and diode and capacitor circuit the first sec current limiter circuit value of R2 vary from 0.24ohm to 12ohm (current varry 100mA to 5A) and wattage 10W the wattage of R3 is V=0.8V and I = 400mA about 0.5W the wattage of emmitter resistance is = ? Please tell me that this circuit is right or any error in this circuit please under line those error In fig 2 R5 replaced fixed resistors that control using CD4066 ic for open and close these resistors that right or not very very thanks a lot
  8. in my mind that junction where transistor or IC leg sold Case transistor or IC outer body ambient mean air am i right or not
  9. hello audioguru and hero how are you i read this topic in this topic describe that heat flow from junction to case case to heat sink and heat sink to ambient please tell me that what did mean junction to case case to heat sink and heat sink to ambient a transistor sold on pcb where transistor leg sold this is junction or other and what did mean case and waht did mean ambient (ROOM Temprature or other) thanks
  10. i am reading this pages http://sound.westhost.com/heatsinks.htm and then questioning about heat sink very very thanks audioguru and hero
  11. All Ok Please expalin these two factor 1. Qjc Thermal Resistance Junction to Case K Package 1
  12. yes Hello Hero and audioguru how are you how the regulator didssipates 6.1W V = 31V and I = 197mA then P = 6.107W am i right and how the transistors each dissipate 37.2W V = 36-0.925 = 35.075V and I = 5A then p = 175.375W each dissipate 175.375/4 = 43.84W am i right
  13. Ok This situation the heat sink size and how design size of heat sink how the regulator didssipates 6.1W V = 5V and I = 197mA then P = 0.985W = ? and how the transistors each dissipate 37.2W V = ? and I = 5A then p = ? please explain
  14. Hello audioguru if max draw 5A current than max Power dissipation of IC 3V*5A =15W if lm338 use as voltage regulator with transister use as current booster attatch diagram than max power dissipation V = 30V & I = Depending upon BE resistor let 50mA & P = 1.5W am i right or not
  15. if lm338 use as current regulator and input voltage 40V the voltage drop across ic at 5A equal to approxomately 3V and at this condition lm338 can handle 5A than P=3*5 = 15W am i right or not than next
  16. Very Very Thanks a lot Question about Diagram which send ago IC1(Which use for current regulator) V = 3V & I = 5A & P = 15W IC1 handle 15W power IC2(Which use for Voltage regulator) V = 30V & I = Depending upon BE resistor let 50mA & P = 1.5W IC2 handle 1.5W power Transistor(Which use for Current booster) V = 30V & I = 5A & P = 150W Transistors handle 150W power am i reight or not How the design heat sink from these ICs and transistors (Size Shape Material and other) Thanks
  17. Very Very thanks a lot Hero Only using Lm338 except lm317 please explain this circuit how circuit work
  18. Internet explorer Pakistan about 2 or 3 days this site doenot open
  19. These statements ok or not this link is not open please attatch
  20. Ok 1. your site silicontronics not open why Questioning about circuit diagram send at post 23 1. This circuit provide good current limiting and 2. 5A current provide at all voltage range 1.2 to 30V and 3. good voltage regulation from 1.2 to 30V 4. if 0-30V instead 1.2-30V than modification on circuit
  21. hello hero where are you your site silicontronics does not open why and you are angry with me why please answer my question
  22. This circuit provide good current limiting and 5A current provide at all voltage range 1.2 to 30V and good voltage regulation from 1.2 to 30V if 0-30V instead 1.2-30V than modification on circuit if lm338 configured as voltage reglator than voltage drop across it = ?
  23. where 4.2V drop 2V drop across IC 1 that for current limiting/regulating 0.7V drop across BE resistor 2V drop across IC 2 that for voltage regulating i am right or not if input voltage 38V than 4.7V drop acrosss these the output will vary easily 1.2 to 38-4.7 = 33.3V yes or not
  24. than any idea for increasing current and tell me that this circuit provide good current limiting and 5A current provide at all voltage range 1.2 to 30V and good voltage regulation from 1.2 to 30V if 0-30V instead 1.2-30V than modification on circuit
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