Not sure what a transformator is? If you are talking about a transformer, they are AC in and out? What is your input and output. DC in will not work.
Here is info one winding transformers if that is what you are after, but you need AC in, or will need a DC to DC converter if you want to go 12 to 24 volts..
Maybe he wants to make a power oscillator that uses 12VDC and drives a stepup transformer. The output is 24VAC or 24VDC but his Engrish is so bad that we don't know what he is talking about.
Not sure what a transformator is? If you are talking about a transformer, they are AC in and out? What is your input and output. DC in will not work.
Here is info one winding transformers if that is what you are after, but you need AC in, or will need a DC to DC converter if you want to go 12 to 24 volts..