@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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Since you have not seen fit to let us know exactly what is going on, I’ll guess. 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. 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.

Elektor Magazine – Spanish – 1982

This old design uses external compensation for 2nd order effects which in closed loop Op Amps causes loss of phase margin and can cause oscillation is no margin. How about contact of the heat sinks? But second one causes a problem on the output that couldn’t been solved yet. I am also surprised you accepted this an answer.

Now I can access them again on-line – how epektor is that? I am surprised your Prof has not helped you isolate this trivial issue. Sign up using Facebook.


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

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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 eleektor these policies. Forgive me if I 1928 some nonsense I do not speak English and I use google translator. Since one PCB worked perfectly and the other one didn’t, I made another one with new board and all elements new. Glad your circuit works. Post as a guest Name.

Some of the projects are almost unbuildable. I found your data useful but not in the presented form, so I imported into a spreadsheet to align the results in two columns and then imported the images from the datasheet PDF.

WhatRoughBeast 49k 2 28 elekgor Any challenge with failures is a good experience to learn. In particular OA’s pins 2,3 must latch for output in linear range which lowers output on pin 6 to cut output.

File:PSU-ElektorARTICLEJPG – emboxit

High ESR of electrolytic capacitors did you check this? Since you have a working one, did you compare the non-working one to the working one? Since this PSU was published by Elektor I assume that some of you might heard or read about this project. I don’t quite get the point your compensation thing. Never use old capacitors especially electrolytic ones – they don’t age that well.

Listen to what IgnacioVazquez-Abrams said too.

Home Questions Tags Users Unanswered. All of these measurements were measured to the common GND of circuit in that part of circuit stabilizer stage. Thus something is loading it. And are you sure the – supply is properly isolated? When we measured with professor, one pin not sure if 13 was making almost square impulses. My LM regulator works well with stable 7. TR2 is power stage of 26V. I lost most of my collection to water damage when I last moved so this is so appreciated.

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Come on, this isn’t hard. Isolate the problem section, determine the error, and fix it. Grounding has a big influence if oscillating at say 10MHz did you elektro pin 13 yet? I hope someone has any ideas or has worked on similar project so I eleektor solve my problem which stayed unsolved till now.

Me and my mentor professor did all kinds of measuring on the not-working PSU – measuring connections, short circuit possibilities, voltage measurement on specified components and with oscilloscope too.

Most likely solder connection errors. When I raise the voltage setting the voltage goes up to 32Vdc when it should go up to 47Vdc, when I reduce P1 the voltage goes up and the potentiometer works upside down min: Now it works perfectly.

Framan – favorite favorite favorite favorite favorite – September 9, Subject: All Power Supplies must be tested for gain-phase margin until proven stable.