Power Supply (+-5vconst & 0-+-12v Variable)





Introduction: Power Supply (+-5vconst & 0-+-12v Variable)

the purpose of this instructable is to make a power supply that can give output of +-5v constant and 0-+-12v variable output.
we often require dc voltages for our experiments then why spend money on cells or rechargeable batteries .why not build a power supply that takes ac(220vrms) and gives required output.

the empty space in the PCB layout is for transformer (in case of any issue)

and please rate it   :)



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    I made a psu with lm317 using the common sschematic.i used your coarse fine adj method as well.resistor values are 1k and 10k pot with 1k pot for fine adj.
    However the voltage cannot be adjusted using both pots.its always 10.6v with 12v vin.
    I replaced 220R resistor to 10k and 1k pot and that reduced the voltage.then used 5k pot instead of 10k and 1k pots.its worked but max voltage was 8.5v.so i removed 1k resistor(R2) and placed 470R resistor now againg its not adjustable.
    What should i do now.i cant imagine the problem.
    Any suggestions?
    And im not using fine tuning now.only 5k pot as R1 and 470R resistor as R2.

    Is this better or lm2596 upgraded psu will good?

    LM2596 is feedback IC therfore I guess it should perform better but I haven't made any comparisons in practical so can't say for sure. Whereas it also depends upon the application if you are using it to power something that does not drain more current than 1A Lm78xx will do just fine. Moreover there are different versions of the same IC i.e. 2A version and so on. It all comes down to your application requirements.

    how to open dns and lyt file in proteus 8.?

    Go to File -> Import legacy project, a dialogue box will appear. In schematic file browse for *.dns File and in layout file browse for *.lyt File. then click Import.

    how do I view the .dsn schematic file.. I really want to build this and cant find the schematic for it

    Dear bro ,
    all the 3 files can be opened by Proteus 6.78SP2
    DSN contains the design (simulation)
    LYT contains the layout (for PCB making)
    and the SDF file is just conccections and is not used that much often
    Thanks :)

    i am interesting in your schematic,because it looks smaller than the most i have seen before
    may i ask for one?
    maixianyu@126.com thx

    I have already uploaded them in the instructable any how
    here is the link to the schematics


    and here is the link to pcb layout


    u can ask if u have any problem in this regard .thanks and rate if u like it : )