0-30V 0-3A Latest Data

[audioguru2]

Look at the schematic above on October 30, 2016 where it shows the RV3 trimpot that sets the current limit calibration accurately.

 

[EricDraven]

Hello!

Can this work as it is with a 16.6V, 2A transformer?

 

[audioguru2]

To use your transformer then many resistor values will need to be re-calculated and changed. The 16.6VAC will have a peak voltage of only 23.5V. The improved circuit is designed to use a 28VAC/4.3A or 30VAC/4A transformer. If you re-design the circuit then with your transformer its maximum regulated output will be about 16.5VDC at about 1.5A. 

 

[EricDraven]

To use your transformer then many resistor values will need to be re-calculated and changed. The 16.6VAC will have a peak voltage of only 23.5V. The improved circuit is designed to use a 28VAC/4.3A or 30VAC/4A transformer. If you re-design the circuit then with your transformer its maximum regulated output will be about 16.5VDC at about 1.5A. 

Thank you very much!

 

[morinho13]

Hi friends 

I need to build this project for me and i need to guide me for the best schematic for this project and PCB with components. Thanks 

 

[repairman2be]

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

















View attachment 42895

 

[Prithul]

Can someone tell me why D10 was removed?

I'm using the very first revision and my Q2 keeps dying even when there is D11. Does removing D10 solve the problem?
 

Thank you

 

[repairman2be]

Hi Prithul,

I believe the answer you are looking for is here:

"http://electronics-lab.com/community/index.php?/topic/29563-0-30v-stabilized-power-supply/&page=84"
audioguru: Post August 31, 2014

A bit more was mentioned on page 87

Please open a new thread if you want to find out more, as this thread is for completed projects. Thanks

 

[Shuhrat]

sallala проект
sallala проекта страницы. Предупреждение, не на английском, так что если Вы не говорите на этом языке, translate.google.com это твой друг здесь.

View attachment 42155

View attachment 42156

View attachment 42157

Почему По схеме автора у меня НЕ РАБОТАЕТ ?

Кто это схему создал отвечайте? У меня на выход минус 5-6 показывает ,на 4-7 выход IC3 37.8в ,на АС 25.5в ,на С1 39.8в ,на IC2 39.7в ,на С1 40в 20000мкФ ,на минус С1 и плюс D3 1n4148 показывает минус 1.5в ,что за хрень ,какой придурок этот схему придумал?

Сначало схему отработайте на 100 процент затем людям по советуйтесь , хуй ваша схема не работает ,по схеме видно ошибки польно)))

 

[Shuhrat]

Если бы я знал что ваша схема тупит как сам автор как баран ,я сколько деньги на плате не тратил ,почему IC2 и IC3 4-выход не вместе ,почему ваша долбаебьская схема не заработала , время все запчасти куплена новый и праверенно ,почему не работает олени тупые)

 

[admin2]

Hi Shuhrat,

We are an English speaking community here. Please post in English so anyone can understand.

 

[Shuhrat]

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!

 

[Nickenl]

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.

 

[admin2]

I came across 2 builds of this power supply with lot's of info on the process and tuning of it.

• http://diyfan.blogspot.com/2012/02/adjustable-lab-power-supply.html
  
• http://www.paulvdiyblogs.net/2015/05/tuning-030v-dc-with-03a-psu-diy-kit.html
  

Worth checking these websites.

 

[fletch2707]

I am another one who has set out to build this supply and discovered the endless possibilities of revisions and possible enhancements to this design. Thank you for this post. The original links on pg 1 need to be revised to point to the relevant posts as I currently end up on the community index page. The links to all the pdf and other files work fine.

 

[admin2]

Here is another forum topic discussing this power supply. (in Russian)

http://forum.cxem.net/index.php?/topic/209045-бп-на-tl081_0-30v-0002-3а-и-его-модификации/

Translated Link: https://translate.google.com/translate?sl=auto&tl=en&u=http%3A%2F%2Fforum.cxem.net%2Findex.php%3F%2Ftopic%2F209045-бп-на-tl081_0-30v-0002-3а-и-его-модификации%2F

 

[tete0010]

Hello. The first thing is to introduce myself and say thank you.
I started with the original version and researching I have come here and I have to say that I have seen beautiful versions derived from v1. 0.
I would like to keep the original project (the TL081, the toroidal transformer of 24v. . . etc), but I've already seen so many projects that I'm a mess. What I'm looking for is simplicity and I don't mind staying at 27 or 28.maximum volts. . . but toroids are not cheap here and I want to take advantage of the one I bought from 24 which one do you advise me for that 24AC transformer?

 

[audioguru2]

The 24VAC transformer probably produces 25VAC with a light load on the project. Then its rectified and filtered output is +34V and -5.6V which power the opamps. At times the voltages are higher. Your transformer will be overloaded if its power rating is 105VA or less (24V at 4.4A)..

The old TL081 opamps have an absolute maximum allowed supply of a total of only 36V so they will not last long. Replace the opamps with TLE2141 opamps that have a maximum allowed supply of 44V.

Many of the resistors and the driver transistor in the original project are overloaded. Upgrade them. The main filter capacitor C1 value is much too low, upgrade it.

 

[frisil]

Hola, ante todo me llaman José Silva, (FRISIL). Me acabo de registrar en Comunidad Electronics-Lab.com.

no soy profesional en la electrónica, apenas estoy comenzando y con avanzada edad (55 años).

E estado observando el desarrollo de esta fuente y me ha despertado un gran interés en armarla.

Yo la estoy simulando en proteus con el TL081, tengo una duda sobre SetOFF NULL en el U2. ¿Este potenciómetro va entre pin 1 y 5?

 

[HarryA1]

From above:

Hello, first of all they call me José Silva, (FRISIL). I just registered at Comunidad Electronics-Lab.com.

I am not a professional in electronics, I am just beginning and with advanced age (55 years).

I have been watching the development of this source and it has aroused great interest in putting it together.

I am simulating it in proteus with TL081, I have a question about SetOFF NULL in U2. Does this potentiometer go between pin 1 and 5?

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