0-30V Stabilized Power Supply

[Tarkul]

Hey I'va tried to find the MC33071 and the TLE2141. The closest I was able to find was MC33171P and MC34002N. The first one is close, but has lower quality. Do you think this matters to much? It can handle the voltage levels required

 

[audioguru2]

Hey I'va tried to find the MC33071 and the TLE2141. The closest I was able to find was MC33171P and MC34002N. The first one is close, but has lower quality. Do you think this matters to much? It can handle the voltage levels required

The MC33171 is low power so its bandwidth is too low for this circuit. The MC34002 has a max supply of only 36V which is too low and its inputs do not work anywhere near ground.

Digikey in Canada and the USA has 439 MC33071, 1323 MC34071 and hundreds of TLE2141 opamps in stock today.
Newark in Canada and the USA has 645 MC33171, 1024 MC34071 and hundreds of TLE2141 opamps in stock today.

Newark is now owned by Farnell who are in many countries.  Go to www.farnell.com and click on the flag of your country.

 

[Tarkul]

Newark is now owned by Farnell who are in many countries.  Go to www.farnell.com and click on the flag of your country.

I cant believe they have Chile Colombia and Puerto Rico, and not have Mexico.... Ill search it somewhere else

How about the MC34080BP? Im losing hope on the circuit. I think ill go with a more simple circuit involvoing one or more lm317k parallel to get 3A 1.27V-32V with no current limiter though...

 

[mendimano1]

The MC33171 is low power so its bandwidth is too low for this circuit. The MC34002 has a max supply of only 36V which is too low and its inputs do not work anywhere near ground.

Digikey in Canada and the USA has 439 MC33071, 1323 MC34071 and hundreds of TLE2141 opamps in stock today.
Newark in Canada and the USA has 645 MC33171, 1024 MC34071 and hundreds of TLE2141 opamps in stock today.

Newark is now owned by Farnell who are in many countries.  Go to www.farnell.com and click on the flag of your country.

 

[audioguru2]

I cant believe they have Chile Colombia and Puerto Rico, and not have Mexico....

Can you sneak across the border into the USA??

How about the MC34080BP?

Its inputs don't work when they are closer than 4V from the negative supply pin.

 

[Tarkul]

Can you sneak across the border into the USA??

jajajaja. Im actually going up north to USA.... Maybe there I can receive the chips
Do you know a good book in electronics? I've already taken circuit subjects(Circuits CA with complex numbers, frequency domain), but I don't know much about semiconductors in general.

 

[redwire]

Tarkul    Mouser is a large firm located in Texas.  They have plenty  of these chips. 

 

[Tarkul]

Tarkul     Mouser is a large firm located in Texas.   They have plenty  of these chips.   

Kool thx redwire

 

[Tarkul]

Someone should change the circuit in the page http://www.electronics-lab.com/projects/power/003/. They should put the version with the MC33071....

 

[audioguru2]

The original version is still there so we can laugh at it.
I agree that the latest version should be added.

 

[Tarkul]

Hey I found another circuit much more simpler and powerful with voltage 0-30V and current limiter (not very exact) 0-6/8A, using lm317 and two 2N3055. NO OPAMPS... lol.

 

[audioguru2]

An LM317 with only one type of  power transistor does not limit the current. A PNP transistor can be added to limit the current.

A current-limiter is not an adjustable current regulator.

 

[karthikeid]

for getting TLE2141 go to texas instruments website and free sample it will be mailed in four days....

 

[mendimano1]

thanx for tip to get TLE2141, please if someone has build the 5 Amps version to post his experience,
first of all what kind of tansformer to use ( mine is 30 volt 8 amps) will it be enogh for 5 amps version

 

[audioguru2]

If the transformer is 28VAC then its peak voltage is 39.6V. When the output of the project is 5A then the transformer must supply 39.6V x 5A= 198VA continuously. Then the 28vAC transformer must have a current rating of 198VA/28V=  7.07A.

A 30V transformer must be rated at 212VA and also must have a current rating of at least 7.07A.

 

[vacana]

which would be a good AC input fuse value for a 115V country?

 

[audioguru2]

The project draws a max of 127VA. Therefore its max current from 115V is about 1.1A. Use a slow-blow 1.5A fuse. A fast-blow fuse will blow trying to charge the huge filter capacitor.

 

[singonn2]

can someone post the full different effect btw the old version  0-30V Stabilized Power Supply with current control and the new updated version? please replace the older version if it's unsafe or too much bugs cos it really make newbie lik me confuse  :-[

isn't the older version totally unable to use ? or it's just will heat up/more ripper when supply up to 20VDC ?
can also provide a most accurate mod parts list ? thx

sorry for my broken english

 

[audioguru2]

can someone post the full different effect btw the old version  0-30V Stabilized Power Supply with current control and the new updated version?

The original cheap kit had many overloaded parts. Its max voltage at 3A was only about 25V (not its rated 30V) and had too much ripple.

please replace the older version if it's unsafe or too much bugs cos it really make newbie lik me confuse  :-[

There are many projects with many errors. Some people made the original versions so they are still here.

can also provide a most accurate mod parts list?

The latest parts list has been posted many times.

 

[PicMaster]

I thought I'd ask the experts on here about these specs are they any good ?
Output voltage variable from 0v to 30V.
- Fine tuning over 1V
- Output current limiting device infinitely variable from 0 to 5A.
- LED (light emitting diode)-indication of current limitation
- Output current: 5A.
- Short-cicuit protected
- Ripple maximum: 0.5mV RMS
- Digital voltage meter: 3-digit, 0.1V accurate
- Digital amperemeter: 3-digit, 0.01A accurate

The ripple is what I'm interested in

Thanks
Picmaster