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0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

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    Description:
    This circuit voltage can be from 0 v, output current can be ma from 2 to 3 a continuously adjustable, set the output current, if the experiment circuit exceeds the current (including short circuit), the circuit protection immediately, not cause danger such as burning device, it is electronic manufacture"s right-hand man. Like making all kinds of audio circuit friend, due to the different working voltage and circuit have a headache, this circuit can also two series into a dual power supply, can meet the needs of all sorts of use.
    English manual:     http://myosuploads3.banggood.com/products/20230706/20230706015646install.pdf
    Transformer: Product ID: 1210628

    Feature:
    Input voltage: 24V ACInput current: 3A maximumOutput voltage: 0 to 30V continuous adjustableOutput current: 2mA - 3A continuously adjustable
    Output voltage ripple: minimum 0.01%
    All straight inserted element, make easy, only an adjustable components ( used to adjust the voltage of 0 v )LED indicator for output over current, when the current exceeds the set data circuit protection, LED lighting, over load and short circuit protection Minimum current (2mA) under the measurable leds and zener diode

    Notice:
    Power production belongs to the high voltage large current circuit, please be sure to carefully, otherwise may cause harm to the personal safety.

    Package included:

    1 x Adjustable DC Regulated Power Supply DIY Kit

    Note:

    The finished product is for reference only, and the parts may be inconsistent, which does not affect operation and use.
    If you need to add a heat sink and fan, follow the installation location as shown below. Note that you need to bring your own heat sink and fan, the package does not include a heat sink and fan.
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    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

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    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

    Customer Reviews

    4.90 out of 5
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    • freds
      21/07/2015

      ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...

      Comments (10)
      Show Original
    • deba168
      IN
      12/07/2017

      The kit is really excellent.I made a variable bench power supply by using this kit.The detail project is on Instructables
      https://www.instructables.com/id/DIY-Bench-Power-Supply/
      https://youtu.be/p50oae_Nnq0

      Comments (3)
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      • 0
        Q: If I used a transformer that already output is 24v DC, Will is Ok? Or will I lose something?
        A:
        NO!! In the instructions it states strictly 24V AC
        Answered by mark3960 on 28/12/2017Helpful (0)
      • 0
        Q: Can I use 12V 1A transformer?????
        A:
        You can use yes, you just can't connect a wire above 24v AC.
        Answered by William Silva Souza on 25/05/2022Helpful (0)
      • 0
        Q: Can I use 12V 3A transformer to power it???
        A:
        24 volts only
        Answered by BG481657251 on 25/12/2021Helpful (0)
      • 0
        Q: o/p voltage not more than 9v what could be the problems?
        A:
        Firstly check the main transformer out put voltage if the transformer is OK showing the required voltage then check the IC and other component including main four diode.
        Answered by kuldeep on 11/11/2021Helpful (0)
      • 0
        Q: what is 100k trimer for?
        A:
        Evidently it is to set the output voltage to 0v when the output potentiometer (10K Pot marked 'V' on the board) is in it's minimum position. Have you not downloaded the PDF instructions for building this PSU?? I haven't built mine yet, but the PDF tells you all the info about it including the above setup method.
        Answered by Vince on 28/03/2021Helpful (0)
      • 0
        Q: can I use a transformer with 34V AC output? And in which wise can modified the input circuit
        A:
        No
        Answered by kuldeep on 12/09/2021Helpful (0)
      • 0
        Q: What's the 100 k trimmer for?
        A:
        yes. trimpot for calibration
        Answered by SRamakrishnan on 01/02/2025Helpful (0)
      • 0
        Q: Hi, as soon as I connect a load of even a few milliamps, the D1047 overheats so much that you can't even touch it. I mounted a heatsink but no fan. Is it normal or can I do some special checks? The LED never lights up. Thank you
        A:
        Look at this site to update the circuit:... www.paulvdiyblogs.net slash 2015 slash 05 slash tuning-030v-dc-with-03a-psu-diy-kit.html
        Answered by Lisa L on 03/02/2021Helpful (0)
      • 0
        Q: how can I use a 24 volt 3 amp centre tapped transformer
        A:
        no. you can use 24-0 not 24-0-24
        Answered by SRamakrishnan on 04/02/2024Helpful (0)
      • 0
        Q: I assembled the power supply, connected to the AC transformer 24 volts. Output voltage ranges from 0 to 4 volts. What could be the problem?
        A:
        If all the components checked OK before assembly, the probable culprit is the (not powerful enough) transformer.
        Answered by lanafina452 on 08/10/2020Helpful (0)
      • 0
        Q: The datasheet indicates a maximum supply voltage of 30V for the TL081. Is there not a risk by supplying them with a rectified and filtered 24V AC voltage, i.e. a DC voltage of about 35V?
        A:
        OP07CP might do the job, It has a supply voltage of 44V max. It is pin compatible to TL081 and best of all, its cheap (*****,50)
        Answered by Impatt on 18/05/2020Helpful (0)
      • 0
        Q: Can I use 24v 4a ac transformer?
        A:
        from the reviews ,I see the comparator ic, will not withstand that voltage. use ***** 15 or gofor higher voltage comparator
        Answered by SRamakrishnan on 02/11/2023Helpful (0)
      • 0
        Q: Can I use 220V - 26VAC transformer to power the board, what will be the impact on the output or on the components?
        A:
        youcan try using. make sure the comparator IC do not burn out.0-26 would be fine not 26-0-26 (dont use)
        Answered by SRamakrishnan on 20/03/2025Helpful (0)
      • 0
        Q: Will the 24-0-24 volt torodail builder machine?
        A:
        of course it'll work. but you have to connect just two outputs of toroidal transformer : 0 and 24V. Isolate the other one.
        Answered by wexler on 27/01/2021Helpful (0)
      • 0
        Q: Hello, how can I have 3 DC output in total? I want to have a Positive, A negative and ground Pins for the power supply
        A:
        This one has only 1 output. What you want is a symmetrical font, Search for ( Dual Variable Power Supply LM317 and LM337 )
        Answered by TonBG248126253 on 10/07/2023Helpful (0)
      • 0
        Q: I bought this product. i assembled it according instructions and checked a few times. I connected it to transformer with output 24AC but I can reach only 27,1V output voltage. Please, let me know what could be a problem and how it could be solved. Thanks.
        A:
        The PCB traces from filter capacitor to output are too thin to carry the 3A as advertised. They need to be reinforced with external wiring.
        Answered by lanafina452 on 25/07/2020Helpful (0)
      • 0
        Q: can I have 2 boards connected on parallel? just to have higher output current? I can add diodes at outputs to isolate etc.. but will it work?
        A:
        Notrecommended, each module should have its own transformer, a better option would be to add an output transistor in parallel.
        Answered by heavyd on 07/06/2020Helpful (0)
      • 0
        Q: Can you connect a display screen to output ?
        A:
        Sure, you can
        Answered by azzam_4u on 10/06/2023Helpful (0)
      • 0
        Q: Why when the potentiometers V and I are at minimum and the output is free LED lights up?
        A:
        ignore led. when used 0-24 v and potentiometer adjusted it won lit up. I tested with balancing ppt and it worked
        Answered by SRamakrishnan on 01/01/2025Helpful (0)
      • 0
        Q: what is the maximum amp of this circuits? what happened if I give an above 3amp output load?
        A:
        3amp
        Answered by alkis78 on 20/04/2025Helpful (0)
      • 0
        Q: 25/03/2022 How is the issue of transport? What is the delay due to the conflict in Ukraine?
        A:
        good product
        Answered by Victor D'angellis on 23/04/2023Helpful (0)
      • 0
        Q: What is the fuse size (A) and type (Fast blow or Retarded blow) for a mains supply of 230V
        A:
        any fuse would be fine
        Answered by SRamakrishnan on 01/04/2025Helpful (0)
      • 0
        Q: My output is stuck at -0,34Vdc, and the overcurrent led is constantly on. Turning the potentiometers or the trimmer does not help, output is always -3,4V. I triple checked the components, and all seems right. I use a 24V transformer that can supply 3 amps too. Anyone had similar problems?
        A:
        I have had it happen, yes. The first time one of the op-amps was bad (always use sockets! Also, i recommend UA741's instead). The second time i blew the big white shunt resistor (It pays to keep spares). If you aren't using a heat sink and fan, i highly recommend that you do. I have about ten of these little kits and love building and using them! Hope this helps.
        Answered by rupe01 on 12/12/2020Helpful (0)
      • 0
        Q: What are the two white connectors for?? Where do they connect??? Input/output, or something else??
        A:
        The 2 white connectors are for the connection option of the voltage and current regulating pots. In case you don't want to install directly to the circuit.
        Answered by BG234445611 on 29/01/2021Helpful (0)
      • 0
        Q: hi I recently got one of these power supply kits and assembled it. It will only output a max 24volt. The input voltage is as required. Can this be increased as there is no instructions or diagram?, also the led lights up even with no load but glows much brighter when set current is exceeded. is this normal operation or have I a problem? as it does work ok otherwise.
        A:
        Low output voltage has 2 main reasons. 1) Transformer not powerful enough. To sustain 30VDC at 3ADC, the transformer must output at least 30x3=90W. This is a rather stringent requirement that not all transformers can meet. 2) PCB traces from filter capacitor to power transistor to output are too thin to carry that 90W. This is a design flaw that can be overcome by reinforcing them with external wiring. Current-limiting LED always on probably because corresponding potentiometer not at fully-clockwise position to disable current-limiting function.
        Answered by lanafina452 on 08/09/2020Helpful (0)
      • 0
        Q: There is a LM7824 on the circuit board which is not in the parts list or the schematic diagram. Please explain and correct.
        A:
        The 7824 is not included... it it optional... There is no need to Correct... Consider it a bonus to add when you get more proficient in electronics.
        Answered by Lisa L on 03/02/2021Helpful (0)
      • 0
        Q: is this have short circuit protection
        A:
        In case of over current it goes into protection
        Answered by William Silva Souza on 25/05/2022Helpful (0)
      • 0
        Q: I have a transformer with a 22/23volt ac and 150watt output. Will this work to power this power supply module
        A:
        yes it will work fine
        Answered by PatracPatra on 06/11/2021Helpful (0)
      • 0
        Q: can I use 24 volt. 3 amp. AC transformer as input
        A:
        Yes, that will be perfect.
        Answered by rupe01 on 12/12/2020Helpful (0)
      • 0
        Q: I have a 18v-2A AC. Can i use this with that kit??
        A:
        if it is 0 -18v you can use
        Answered by SRamakrishnan on 26/12/2023Helpful (0)

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