For my graduation project I need this converter but I would like to have the electrical schematic.

enter image description here

This is the link to the store where I bought the part. That's all I know.

I have looked up the chip number and this is the only schematic that I found, components do not correspond with those visible in the picture: enter image description here

enter link description here

I tried reproducing the pcb in multisim, did not work. If I assume that the schematic is correct the problem lies with the module.

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    \$\begingroup\$ You haven't even told us the part number of the product and you want us to give you the schematic! Did you look for the datasheet for the chip which is clearly labelled? \$\endgroup\$ – Transistor Nov 11 '18 at 13:38
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    \$\begingroup\$ so, why are you asking us rather than whoever sold you this converter PCB? Have you tried anything like googling the name of the central component (LM2596S)? \$\endgroup\$ – Marcus Müller Nov 11 '18 at 13:39
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    \$\begingroup\$ By the way, I would recommend against using this very converter board in my graduation project. The LM2596S is a Texas Instruments chip (formerly National Semiconductor). The chip depicted has no Texas (nor the National Semiconductor) logo on it. It's most certainly a counterfeit chip. You're basing the non-frying of your graduation project on something that might or might not work as intended. \$\endgroup\$ – Marcus Müller Nov 11 '18 at 13:43
  • \$\begingroup\$ Google for the datasheet of the LM2596. That will contain a basic functional circuit for the LM2596. From that, you should be able to work out the circuit of the board you have. \$\endgroup\$ – JRE Nov 11 '18 at 13:51
  • \$\begingroup\$ The circuit you posted almost certainly is the same as the module circuit. I see a couple of 220uF capacitors, a 330uH inductor, a 10k variable resistor, an SS54 diode, and of course the LM2596 on your module. All straight out of that schematic you posted. \$\endgroup\$ – JRE Nov 11 '18 at 13:54

... components do not correspond with those visible in the picture:

It looks pretty darn close to me:

annotated photograph

What more do you need?

Note that the component I've marked C3 may actually be a diode (overvoltage and/or reverse polarity protection?), and the pads next to it might be for a capacitor. Also, the empty pads next to C2 would be for C4, which is marked as "not fitted" in the schematic.

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    \$\begingroup\$ "C3" is an SMT version of the 1N4004, a shunt 1A diode on the input in case of reverse voltage, most likely. \$\endgroup\$ – Spehro Pefhany Nov 11 '18 at 15:52

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