@Keno – “Yes, heart of the problem is % “the changing of voltage” Right. So stop beating around the bush and tell us what the voltages. Hi, Elektor – I might call- circuit is not bad. Couple of minor modifications made here. Check this out. Item, Type, Manufacturer, Date. Elektor – July/August , Magazine, Elektor – November , Magazine, Unknown. Elektor – October , Magazine.

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Now it works perfectly. I made two of these PSU’s in one housing. Isolate the problem section, determine the error, and fix it.

Elektor Magazine – Spanish – : Free Download, Borrow, and Streaming : Internet Archive

eelktor If the first PCB works without this compensation then why would the not-working one need it. But the information and the descriptions of the circuits and how they function are a very practical way to see the real world of electronics after learning from the textbooks.

And if the voltages are changing, then isolate the section by removing the 3 base drive components R9, D4 and D5and find out why the is acting up. This old design uses external compensation for 2nd order effects which in closed loop Eleitor Amps causes loss of phase margin and can cause oscillation is no margin.

I don’t quite get the point your compensation thing. I myself don’t have the scope. And if I connect load on the output the voltage slowly descends till 0V everything seems like there should be a capacitor making these problems I changed Op-amp, LM and a few capacitors every of them but smoothing capacitor – my professor said that it wouldn’t be making such problems. You can show this on your thesis to demonstrate real world issues.


Elektor Magazine – Spanish – 1982

Start by removing the diode from the current eldktor op amp. Then the voltage changes slowly from 3V-5V. How about contact of the heat sinks? I am surprised your Prof has not helped you isolate this trivial issue. Treasure trove of electronics information I first dipped my toes into electronics engineering via Elektor and I have profited greatly from it over the years.

Elektor Magazine

I changed Op-amp, LM and a few capacitors every of them but smoothing capacitor – my professor said that it wouldn’t be making such elekhor. All Power Supplies must be tested for gain-phase margin until proven stable. I hope someone has any ideas or has worked on similar project so I can solve my problem which stayed unsolved till now.

Some of the projects are almost unbuildable. Since one PCB worked perfectly and the other one didn’t, I made another one with new board and all elements new. I found elektof data useful but not elektpr the presented form, so I imported into a spreadsheet to align the results in two columns and then imported the images from the elektlr PDF. Thanks for the effort it took to get this all together. Never use old capacitors especially electrolytic ones – they don’t age that well.

An important addition to the Archive An important addition to the Archive. Eleotor the history of over billion elektod pages on the Internet. One issue I did retain for posterity was Elektor Book 75 which I could not locate in the English archive listing https: I would tell you Check some things:. If you can put more pictures, it may be easier for someone to see something wrong and find the defect. Post as a guest Name.


Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Tony EE rocketscientist 62k 2 21 When we measured the Op-amps and LM, on certain pins there was voltage also slowly changing. Advanced embedding details, examples, and help! Sign up or log in Sign up using Google. Since this PSU was published by Elektor I assume 9182 some of you might heard or read about this project.

TR2 is power stage of 26V. I managed to solve it, the defect was because I replaced the original transistors T What we found out is next – after turning on the PSU, the output voltage rises to certain level depends of voltage potentiometer and than starts to slowly descending til 3V.

File:PSU-ElektorARTICLEJPG – emboxit

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Most likely solder connection errors.

Instability due to the use of lower voltage supply in the Elekotr you Thank you so much, it was a fantastic job.

Topics ElektorMagazineCollection. Sign up using Email and Password. Alternate method is the step load Q or ringing response to determine stability margin.