Algot

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  1. Algot

    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 not been able to understand them in the past.
  2. Algot

    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, could someone explain to me how this works? Does the power supply need no protection fuse in the output? How does it protect itself in the case of a simple polarity change, for example: a battery being connected with the polarities exchanged in the output with the whole circuit without power in its entrance? Or even if it is powered, but with the polarities of a load on its output inverted? That is, is she going to protect herself against dodgems like me? Thank you again, Algot.
  3. Algot

    0-30 Vdc Stabilized Power Supply

    I understood your explanations and I already know what I did wrong. Thank you very much.
  4. Algot

    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 load is turned on. This voltage drop goes from 0.02V up to 0.08V at the most different voltage and current. That is, at lighter loads it is at 0.02V, but at heavier loads it can reach at 0.08V. Is it possible to correct this little problem? What do you think about it? Thank you for your attention and I sincerely apologize for my English because I am from Brazil and I am using Google translator. Algot.