@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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Did you measure phase margin from step load?
My LM regulator works well with stable 7. Since this PSU was published by Elektor I assume that some of you might heard or read about this project. Sign up using Facebook. 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 don’t really bother what went wrong there. I am grateful if you can help as I used google to translate this message before. Grounding has a big influence if oscillating at say 10MHz did you scope pin 13 yet?
All of these measurements were measured to the common GND of circuit in that part of circuit stabilizer stage.
Elektor Magazine – Spanish – : Free Download, Borrow, and Streaming : Internet Archive
EEsince’75 – For what it’s worth, I’m surprised as well. Thank you Thank you so much, it was a fantastic job.
Elektor Magazine – Spanish – 1982
Now I can access them again on-line – how good is that? Elektod beating around the bush with generalities. Thus something is loading it. Come on, this isn’t hard. 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. 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: Glad your circuit works.
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Never use old capacitors especially electrolytic ones – they don’t age that well. 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.
Any challenge with failures is a good experience to learn. This is also my final school project.
Framan – favorite favorite favorite favorite favorite – September 9, Subject: When we measured the Op-amps and LM, on eleitor pins there was voltage also slowly changing. I hope someone has any ideas or has worked on similar project so I can solve my problem which stayed unsolved till now. Sign up or log in Sign up using Google. Not all of the information is current.
Tony EE rocketscientist 62k 2 21 Since you have a working one, did you compare the non-working one to the working one? elemtor
If the first PCB works without this compensation then why would the not-working one need it. Then the voltage changes slowly from 3V-5V. Just what I was waiting for – brilliant!
op amp – Precision Power Supply / Elektor, December, – Electrical Engineering Stack Exchange