@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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Stop beating around the bush with generalities. Forgive me if I wrote some nonsense I do not speak English and I use google translator. A common issue is the thru hole lead inductance of cap and ground connections can cause phase shift and if not compensated properly will oscillate.

File:PSU-ElektorARTICLEJPG – emboxit

WhatRoughBeast 49k 2 28 Isolate the problem section, determine the error, and fix it. Since you have not seen fit to let us know exactly what is going on, I’ll guess. In particular OA’s pins 2,3 must latch for output in linear range which lowers output on pin 6 to cut output. 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. Then the voltage changes slowly from 3V-5V. How, exactly, are the two supplies connected?


Sign up using Facebook. Since you have a working one, did you compare the non-working one to the working one? Elektor Magazine Item Preview. I saw through your measurements that some voltages are way out of the way I 9182 tell you Check some things:.

Glad your circuit works. Now it works perfectly. Did you measure phase margin from step load? How about contact of the heat sinks?

Elektor Magazine – Spanish – 1982

Topics ElektorMagazineCollection. Since this PSU was published by Elektor I assume that some of you might elfktor or read about this project.

Thanks for the effort it took to get this all together. You can show this on your thesis to demonstrate real world issues. I don’t really bother what went wrong there. 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. My LM elektir works well with stable 7. When we measured the Op-amps and LM, on certain pins there was voltage also slowly changing.


Grounding has a big influence if oscillating at say 10MHz did you scope pin 13 yet? Any challenge with failures is a good experience to learn. I myself don’t have the scope. Keno 1 9 Mine still has trouble adjusting the voltage. Sign up or log in Sign up using Google. Instability due to the use of lower voltage supply in the 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 – Spanish – : Free Download, Borrow, and Streaming : Internet Archive

When we measured with professor, one pin not sure if 13 was making almost square impulses. Email Required, but never shown.

Come on, this isn’t hard. 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. I managed to solve it, the defect was because I replaced the original transistors T I am from Brazil, I am also mounting this source 3 outputs: Not all of the information is current.

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