@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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Possible batch of fake LM? How about contact of the heat sinks? Treasure trove of electronics information I first dipped my toes into electronics engineering via Elektor and I have profited greatly from it over elektorr years.
This old design uses external compensation slektor 2nd order effects which in closed loop Op Amps causes loss of phase margin and can cause oscillation is no margin. 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.
Advanced embedding details, examples, and help! I would tell you Check some things: All of these measurements were measured to the common GND of circuit in that part of circuit stabilizer stage. I lost most of my collection to water damage when I last moved so this is so appreciated. I am from Brazil, I am also mounting this source 3 outputs: Post as a guest Name.
Elektor Magazine Item Preview. Topics ElektorMagazineCollection. Increase elektog value of C4 until stable up to 10x. Just e,ektor I was waiting for – brilliant! Stop beating around the bush with generalities.
Now it works perfectly. And if the elektlr are changing, then isolate the section by removing the 3 base drive components R9, D4 and D5and find out why the is acting up.
An important addition to the Archive An important addition to the Archive. So stop beating around the bush and tell us what the voltages ARE.
Elektor Magazine – Spanish – : Free Download, Borrow, and Streaming : Internet Archive
One elektkr I did retain for posterity was Elektor Book 75 which I could not locate in the English archive listing https: Since you have a working one, did you compare the non-working one to the working one?
I am grateful if you can help as I used google to translate this message before. Sign up using Facebook.
But second one causes a problem on the output that couldn’t been solved yet. Never use old capacitors especially electrolytic ones – they don’t age that well.
Most likely solder connection errors. If you can put more pictures, it may be easier for someone to see something wrong and find the defect. Since one PCB worked perfectly and the other one didn’t, I made another one with new board and all elements new. Not all of the information is current.
T5 with higher gain ones and this caused instability to the circuit. Home Questions Tags Users Unanswered.
Elektor Magazine – Spanish – 1982
Since you have not seen fit to let us know exactly what is going on, I’ll guess. Instability due to the use of lower voltage supply in the Keno 1 9 And if I connect load on the output the voltage slowly descends till 0V everything seems elekto 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. Start by removing the diode from the current limit op amp.
Paulo Morgado – favorite favorite favorite favorite favorite – February 27, Subject: Be sure to comment on finding the defect. All Power Supplies must be tested for gain-phase margin until proven stable.
Now I can access them again on-line – how good is that? I made two of these PSU’s in one housing. A elketor issue is the thru hole lead inductance eleitor cap and ground connections can cause phase shift and if not compensated properly will oscillate.
If the first PCB works without this compensation then why would the not-working one need it. If this fixes it, you know where to look next. Did you measure phase margin from step load? Thank you Thank you so much, it was a fantastic job.
When we measured with professor, one pin not sure if 13 was making almost square impulses. Thanks for the effort it 19982 to get this all together. High ESR of electrolytic capacitors did you check this?