Recent content by Jeff A.

  1. Jeff A.

    0-30 Vdc Stabilized Power Supply

    I discovered ... The problem has nothing to do with the power supply. I was using a voltmeter based on the ICL 7107 to make the measurements, and when I put another meter I did not find any variation in the output voltages. The readings of my small home-mounted voltmeter go up only when the...
  2. Jeff A.

    0-30 Vdc Stabilized Power Supply

    Hello, Sorry, I was referring to Q2. I'm using TIP31C for Q2.
  3. Jeff A.

    0-30 Vdc Stabilized Power Supply

    Gentlemen, Some time ago I asked you to help me solve a voltage drop, but now I come again to ask for your help to solve a completely opposite problem: voltages are rising when I connect small loads at different voltages. Below is a short report: voltage without load               voltage...
  4. Jeff A.

    0-30 Vdc Stabilized Power Supply

    Now, finally, I have been able to understand the function of Q1 and resistors R13 and R14. I'm doing tests on a Prontoboard, and during the power-off, the output voltage goes to the maximum when the transistor Q1 is removed from the circuit. Thank you very much for your new explanations, I had...
  5. Jeff A.

    0-30 Vdc Stabilized Power Supply

    Gentlemen, I know I have a specific topic for the improved project, but I'm still trying to understand some things in the original project. I can not understand the operation of transistor Q1 in the circuit. It has been said here in the forum that this transistor works as a protection system...
  6. Jeff A.

    0-30 Vdc Stabilized Power Supply

    I understood your explanations and I already know what I did wrong. Thank you very much.
  7. Jeff A.

    0-30 Vdc Stabilized Power Supply

    Dear Sirs, I followed the discussions on the topic of the power supply project and during the last few years I set up different boards, all with the suggestions and improvements that you have suggested. In all the tests and prototypes that I made happens a small drop in voltage every time a...
See more
Top