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Jeremy

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Posts posted by Jeremy

  1. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    2 hours ago, repairman2be said:

    @Jeremy

    I have built a Power Supply according to Liquibyte post here:

    "electronics-lab.com/community/index.php?/topic/40835-0-30v-0-3a-latest-data/&page=2#comment-156499"

    I have had made PCB's from his gerber files he offered. The board has a size of 67x100mm. If you want one or more board leave a message here.

     

    Regards, William

    Hi.

    How much is it cost? I haven't time to do it again from begining (PCB).

    I think that my problem with banggod kit is easy to fix. With a 30 V or 15 V  on out  I making a  short circuit  , LED is blinking and current is  4,7 A.

    Too bad .. .

    They do not help  with ebay kits.

    Regards

     

  3. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    Hi.

     I add the trimpot 100 k and resistor 33 K instead 56k. Sensor resisor is the same 0.47 Om.

    All rest is the same like basic version. It is look like there is not current protection, - minimal  adjustment is  at the minimum pitch of the potentiometer and after 1/4 range  current is not limited ( once Q2 was replaced -  was a short circuit)   It's probably PCB mistake . I have red one too from ebay (kit).

    I build the same power supply  a few years ago with PCB by myself and it is working for today! Great construction!

    Now I want smaller version, but from ebay or banggood (red version kit) doesn't work properly.

    On the movie is mistake with current point. Value of the current is 2.7 A not 0.27 A - one more mistake from banggood - bigger range of panel

     

    Regards.

     

     

  4. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    On 18.11.2016 at 2:28 AM, Janisstals said:

    Hello. This is my first post here. So HI!

    im building this power supply, but I have ordered already premade board from eBay(the red ones). I have soldered and it's all working correctly (sort of). But I'm having trouble with current limiting. When the pot is turned all the way up the current can spike to 10-15 amps depending on the load and then fry the power transistor. I doo have a transformer that can supply more than 3a but that shouldn't work like that. So does anybody have an idea how to fix it?

    Sorry if it has already been dicused in this forum, but google didn't provide answers and 75 pages is just too much. 

    Hi all.

    I have got the same issue.

    The adjustment of current limiting from zero to max is on 1/4 of the range potentiometer.

    It is looks for logarithmic regulation not linear. 

    Any clues ?

     All checked two times.

    Regards

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