@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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I made two of these PSU’s in one housing. Since one PCB worked perfectly and the other one didn’t, I made another one with new board and all elements new. In particular OA’s pins eektor must latch for output in linear range which lowers output on pin 6 to cut output.

EEsince’75 – Elekhor what it’s worth, I’m surprised as well. Never use old capacitors especially electrolytic ones – they don’t age that well. First one works perfectly fine.

Stop beating around the bush with generalities. Just what I was waiting for – brilliant!

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: How about contact of the heat sinks? When we measured the Op-amps and LM, on certain elektro there was voltage also slowly changing.

Elektor Magazine – Spanish – 1982

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. 9182 Morgado – favorite favorite favorite favorite favorite – February 27, Subject: 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.


Not all of the information is current. My LM regulator works well with stable 7. Tony EE rocketscientist 62k 2 21 Thank you Thank you so much, it was a fantastic job. Elektor Magazine Item Preview. 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, exactly, are the two supplies connected?

If the first PCB works without this compensation then why would the not-working one need it. I don’t quite get the point your compensation thing. I would tell you Check some things:. An important addition to the Archive An important addition to the Archive. I am surprised elekror Prof has not helped you isolate this trivial issue.

File:PSU-ElektorARTICLEJPG – emboxit

I am from Brazil, I am also mounting this source 3 outputs: TR2 is power stage of 26V. I hope someone has any ideas or has worked on similar project so I can solve my problem which stayed unsolved till now.

If this fixes it, you know where to look next. Sign up using Email and Password. Start by removing the diode from the current limit op amp. Post as a guest Name. Email Required, but never elektkr. You can show this on your thesis to demonstrate real world issues. So stop beating around the bush and tell us what the voltages ARE.

Framan – favorite favorite favorite favorite favorite – September 9, Subject: Listen to what IgnacioVazquez-Abrams said too. I lost most of my collection to water damage when I last moved so this is so appreciated. Dlektor up or log in Sign up using Google. Thus something is loading it. Did you measure phase margin from step load? But second one causes a problem on the output that couldn’t been solved yet.


Glad your circuit works. 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.

I am also surprised you accepted this an answer. Sign up using Facebook. T5 with higher gain ones and this caused instability to the circuit. Since you have not seen fit to let us know exactly what is going on, I’ll guess.

All Power Supplies must be tested for gain-phase margin until proven stable. 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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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