| Electronics > Repair |
| SOLVED: help on repairing a faulty 80s style stabilized DC power supply |
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| BravoV:
--- Quote from: Kiriakos-GR on November 05, 2011, 10:28:33 pm ---I love to help people, but for a such tiny and simplistic PSU, asking for help in the EEV sounds crazy to me. ;D --- End quote --- Love to help people ? If you don't have anything nice to say or "contribute" to this thread (which I doubt about it), you should not insult and provoke people like that, that is a legitimate beginner question and a legitimate place to ask. Tiny & simplistic ? With your track record around here, I doubt you even have any idea what he is talking about, or understand how that circuit works at all. Btw, who the fuck do you think you are that you can decide what can be posted here or not. Axel, Apologize for this brief out of topic discussion, just don't let this kind of junk post demotivated you for asking, I'm sure there are lots of nice forum members here that are known to be very helpful & kind such like above gentlemen. That dude is well known asshole around here for a long time, just ignore it. |
| Uncle Vernon:
--- Quote from: BravoV on November 06, 2011, 06:23:56 pm --- --- Quote from: Kiriakos-GR on November 05, 2011, 10:28:33 pm ---I love to help people, but for a such tiny and simplistic PSU, asking for help in the EEV sounds crazy to me. ;D --- End quote --- Love to help people ? If you don't have anything nice to say or "contribute" to this thread (which I doubt about it), you should not insult and provoke people like that, that is a legitimate beginner question and a legitimate place to ask. Tiny & simplistic ? With your track record around here, I doubt you even have any idea what he is talking about, or understand how that circuit works at all. Btw, who the fuck do you think you are that you can decide what can be posted here or not. --- End quote --- The self appointed welcoming committee. Great way to treat a newbie to the forum. It's been suggested more than once if Captain Athenia wants to run everything his own way he could start his own website. But he's tried that already so he lurks about here where there are actual people to annoy with the idle bragging and postal updates. --- Quote ---Axel, Apologize for this brief out of topic discussion, just don't let this kind of junk post demotivated you for asking, I'm sure there are lots of nice forum members here that are known to be very helpful & kind such like above gentlemen. That dude is well known asshole around here for a long time, just ignore it. --- End quote --- Agree wholeheartedly. Welcome to the forum Axel, apologies for the idiot's response to you. Your questions were entirely reasonable and were located in the beginners section, all of which is entirely reasonable. I'm sure you will see many people here will take the time to help with reasonably posted questions like yours above. |
| EEVblog:
Good to hear you got it fixed. Awesome work on the reverse engineering and generating the schematic and notes, that's the way you learn a lot! Now that it's fixed, and you've learned how it works, but not regulating that well, how about simply replacing the main pass transistor with an LM317? Dave. |
| Axel1973:
Hello all Helpers! Hello Dave, I wanted to give a little update my tiny little project. THE PROBLEM IS SOLVED! With the Tips you gave me here i was able to locate the DEAD T1 and replaced it with an old desoldered BC338 i had lying around for decades of no use. Yeah sorry, i didnt had a BC337 :) And the internet said a BC338 would replace a BC337, so i tried and it worked. The more detailed process can be read on my project page at www.awerner.homeip.net. THANKS FOR ANY HELP/ADVICE! THANKS TO ANY MAKER WHO FREELY SHARES KNOWLEDGE, VIDEOS, TUTORIALS AND OTHER FREE LEARNING MATERIAL ON THE INTERNET! Information wants to be free! Keep information free for everyone! best regards Axel @DAVE: gotcha! MANY little experiments and basic learning circuits are coming up on me. Ive got to re-learn so much after 20 years doing nuthin in electronics. Covering basic 555 and 47xx oscilators, buildin basic ESR meter to test electrolyt caps, integrated voltage regulators to "improve" the old CONRAD PSU with a much better highly linear high current regulator, basic op-amp circuits to adapt voltage ranges of sensors or to sense current flows through shunt resistors, variable electronic DC dummy load to test small PSUs or regulator circuits, also very interesting to me are simple switch mode PS like step-up/step-down converters, fly-back transformers etc. And somewhere in between ill have to repair my old portable Standard C528 HAM Radio which seems to have died in the last 12 months or so (problem: permanently transmitting). I already googled the problem. It seems its one of many common problems todays with the C528. Most often the reason are the SMD electrolyte caps and tantals that are dying slowly over the last 15yrs or so. That will be a dirty job coming up, replacing all the SMD caps in there. But just buying a new radio would not be that much fun and interesting :) 73 et 55 de Axel (DG2GWE) |
| jimmc:
Congratulations Axel, I'm pleased to see you've fixed it and impressed by your write-up. To my mind a desire to understand and repair a basic piece of equipment is to be encouraged. Never be afraid to ask. Jim |
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