Recent content by Tristable

  1. Tristable

    0-30 Vdc Stabilized Power Supply

    Hi! When I buy proper heatsink I will test PS for a longer period and then report. It's robust, it will keep it up.  ::) And a question about measuring output current as voltage over R7: wont R7s tolerance and temperature change ruin correct reading? Thanks, Triple
  2. Tristable

    0-30 Vdc Stabilized Power Supply

    Hi! Yes, you're absolutely right! My power supply is working!  :D Yes, you were right about that too. My apologies that I claimed contrary. What else to say... Everything is working fine, just one thing I don't understand: I have exactly 30,8 VDC and 3,08 ADC at max setting over 10 Ohm...
  3. Tristable

    0-30 Vdc Stabilized Power Supply

    Hello, it's me again. I've replaced burned output transistor with 2 new ones. I still belive that current regulation is not working, because load isn't reacting on pot 2 changing no mather how, just, like I said before, only drops the voltage down and turns the LED on at max setting. Can you...
  4. Tristable

    0-30 Vdc Stabilized Power Supply

    Hi! Well, then allright. No problem, I will fix this as soon as I get. Thank you!
  5. Tristable

    Led display Digital Voltmeter question

    Everybody, Hello! I'm building power supply from this great community. (looks familiar?) And yeah, I want to add this meters in my PS. So, I have 2 questions: 1. As I need only measuring positive voltages, I will use just positive 5V supply.     And as my meter will be set on 0-200V range...
  6. Tristable

    0-30 Vdc Stabilized Power Supply

    Hello, Audioguru! Thanks for answering. OK, maybee I'm just care to much about opamps. I have to recalibrate my heat sense.  ;D My mistake. I was thinking on R4. It's 1k. I built PS regarding to modified list (just used a 100 VA trafo, BD243C as Q1 and Q2, and BZX85C instead BZX79C), so all...
  7. Tristable

    0-30 Vdc Stabilized Power Supply

    Audioguru, hi! Thanks for your answer. I don't know about opamps, but they seem to warm to me. I ckecked some things once again, and I've done some measurments. So far, here are the results: All transistors are OK - not burnt and correctly connected I was checking voltage refernece and found...
  8. Tristable

    0-30 Vdc Stabilized Power Supply

    Community, Hi!  ;) I would need your help. I'm not realy total newbie, rather a electronics student [newbie]  ;D. Ok, lets get serious now. Of course, I built this power supply. (modified 3A version, 30V trafo, OPA445's, 10000 uF cap. ...) And also there is a 'little' problem... Voltage...
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