Guest liquibyte

0-30V 0-3A Latest Data

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I will explain to you in English,
Hello dear developers of the scheme, I ask you to solve the problem, why I collected the circuit did not work on the IC mc34071, on the input circuit 25.5v, on the C1 39.8v, on the Ic3 4-foot -1.5v, on the output circuit -5v, help please what is the problem, why does not it work? I have no experience with electronics, help please?R1 2.2k 2w ,R3 230R 0.5w ,R2 83R 1w ,R7 0.11R 15w ,Q4 2sc5200 1,Q1 bc139 ,Q2 s9014 ,Q3 s9015 ,R22 1.2k 1w ,D1 10v0.5w ,D8 5.1v1w!

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On 2017-02-27 at 12:46 AM, repairman2be said:

Hi all,

Finally after some months have gone by, my build of the Power Supply is done.

I have used liquibyte schematic Rev. 8 and had made the cirquit board according to the Gerber.zip file he posted here:

0-30V Stabilized Power Supply

Page 88 posted October 6, 2014

"http://electronics-lab.com/community/index.php?/topic/29563-0-30v-stabilized-power-supply/&page=88"

I left out D10 and R15 as per his description.

I have plenty of boards leftover if someone has a need for it. There was only one mistake liquibyte made which have outlined in one of the pictures uploaded here.

I was fortunate enough to get a big case with a Toroidal transformer from the scrapyard. Also many parts are recycled from various sources.

Regards, William

 

 

 

 

 

 

 

 

Hi

I also made this project after your example (however i had to etch the boards my self, little bit hard from these gerbers but any way:-))

It worked nice but after a little longer session with a 12v 25w lamp the current control started to oscilate and be unreliable when i was testing.

Any ideas about where to start. I am not an expert so thats why I am asking.

The only thig i have tried so far is ro replace the tle op amp but same result.

 

Attaching some pictures of my project as well.....

 

And yes i realise that a cooling fan is needed:-)

 

 

Regards Niklas

 

Ok so now solved:-)

 

Now it works like a charm again and the problem was that due to a tight layout i had a small pice of aluminium on the backside of the board between two thin lines. (it did not burn anything so lucky i guess).

Just have to find a good way for the cooling fan.

 

DSC_0004.JPG

DSC_0005.JPG

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