Recent content by Emiliano86

  1. Emiliano86

    LM317 Variable power supply

    hello...i have read all the comments adn i have some questions: 1- i want to design a pSU with 1.2-30V output at the maximun load possible, so what can i do to improve the ripple rejection?, more filter caps? 2- if the soulutio is to use more filer caps, i must use a bigger bridge, do not I...
  2. Emiliano86

    0-30 Vdc Stabilized Power Supply

    hi ante, The ripple appeared when I'd connected a load at maximun voltage that it gives (in my case 27V) and at 2.35 Amp, i know that it is very uncommon situation, it was only a test, ofcoures that without load it does'nt gives ripple. The solution is to connect a higer voltage transformer...
  3. Emiliano86

    LM317 Variable power supply

    Pinky...i am planing to build this project, a regulated PSU with the LM317, i was searching on the net and i found a very similar regualtor the same voltage butinstead of 1.5 A, it can manage 3 A.......but bell I have some questions......for the LM317 PSU: 1 - if Iwant a 30VDC at maximun...
  4. Emiliano86

    0-30 Vdc Stabilized Power Supply

    yes...but the problem is that it is imposible to find that OA in my country......I don't know what to do!!!!!!!...... I A M F R I E D!!!
  5. Emiliano86

    0-30 Vdc Stabilized Power Supply

    hi audiogoru!!......how are you?.....i am fighting with this PSU.....i could repair the current and voltage regualtor, i 've added two more 2n3055 transistors and it works fine.....it gives 3.25487 amps.....but the real bad thing apperared qhen i connected and test it in the...
  6. Emiliano86

    0-30 Vdc Stabilized Power Supply

    OK, I
  7. Emiliano86

    0-30 Vdc Stabilized Power Supply

    YES AUDIOGORU.....AT FIRST I WORKS WHAT THE I PUT A BIG LOAD....THANK AUDIOGORU!!.. ;D
  8. Emiliano86

    0-30 Vdc Stabilized Power Supply

    Audiogoru, I have a problem, when I turn on the Power Supply the output is constant at 29,8 VDC. My transformer is : 24 VAC - 75W The DC Voltage at the base of 2N3055 is 32 VDC I am using the TL081C OA The voltage at pin 6 of U2 is 27 VDC The voltage at the pin 3 of U2 is 9,3 VDC I don't...
  9. Emiliano86

    Led display Digital Voltmeter question

    thanks , MP ;D
  10. Emiliano86

    Led display Digital Voltmeter question

    gonza.....why don't you try with the pcb pulicated on this web.....i used it and it worked!!!.......i'm doing some adjustments!.....but it works!!..... (i'm from argentina too!!)
  11. Emiliano86

    0-30 Vdc Stabilized Power Supply

    audiogoru!!...i need your help....i built this PSU...and he led voltmeter with the 7107.....but when i connect it with that PSU..it turns off.....i think that it could be because : 1- I have a 70 VAC at the output when i have 30 VDC.. to make the dual polariti supply I took 24VAC from the...
  12. Emiliano86

    Led display Digital Voltmeter question

    hello, my name is Emiliano, and I have a problem with this circuit: "I've built the project -0 to 30 PSU-, and I decided to built this Voltmeter to conect it directly to the output from the PSU, but when i do that the Voltmeter turns off, I test the Voltmeter with another power and i...
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