hello hello dear friends welcome to this new video today we are going to look at how to modify the voltage of a transformer in this case we have a transformer that enters 120 volts through these two black wires and has two central contact voltage outputs each of which the idea is to learn to determine how many turns or loops of wire need to on the secondary side to obtain new voltages needed without changing the primary coil we first perform diagram coils paths so we need measure continuity in the primary coil and in the secondary coils although here with the naked eye we can see that the transformer has two voltage outputs in this case the thin wire that you see here clearly indicates that it is a central contact voltage output and this other which has the thickest wire is also indicating that it is another voltage output also central contact as We can look at it with the naked eye, then we are going to measure continuity to check if this is the case and we are going to make the diagram the primary coil measures continuity and do not forget 4.6 ohms and the secondary coil measures continuity the first three corresponding red black and blue cables At the voltage output of the wire that looks thicker and do not forget continuity the white, blue and white wires that correspond to the other output will on the scale of measuring resistance we have 0.7 ohms and 0.7 ohms for the coils of the thick wire and we have 5.3 ohms and 5.6 ohms for the coil of the wire and thin which effectively indicates that the black wire would be the central tat for these voltage outputs and the blue wire would be the central datt for this other output of turns, then we will then measure the output voltage to measure the voltage we connect the primary coil of the 120 volt alternating current network and measure voltages on both outputs in this case to the thick wire we have 29 volts and 29 and for the other coils we have 19 points 5 and 19 points and we have then that according to the measurements we take we have two central contact voltage outputs, each one gives us 19.5 volts and the other gives us 29 volts these data help us to determine how we are going to modify the coils to be able to obtain new voltages that we need in this case I need to modify them in such a way that I obtain three new coils one that gives me 12 volts and another that gives me 17 and the The last one that gives me twenty-nine bolt the current I need in the first coil is 1 amp in the second I need an amp and in the third I need 3 amps if we did the calculations to pay a transformer on purpose I invite you to see one of my previous ones videos where he taught how to do the calculations to master a transformer we could realize that when we need a low voltage in a transformer normally the formula gives us that we must use a thicker gauge as opposed to a higher voltage in other words if we did the calculations for this transformer we could realize that the wire we need for these 11 volts would be much thicker than the wire we need for these 29 back or as the requirements we have at this time is that these 11 volts only give us one ampere in these cases we can use a wire that gives us one ampere and we do not necessarily need to use a heavy gauge that could give us 56 amperes but we can use a thin wire so that it gives us only the ampere that we need that way we also save space in the transformer in this case so the modification that we are going to do is the following we are going to remove a coil from this part that is giving us 29 volts contact central and we are going to remove these other two coils also central contact and we are going to make two new coils that provide us cion one 17 volts and the other 11 volt for this we are going to disassemble the transformer and we are going to count the turns that these coils have to determine the number of turns per volt that has been used in this transformer, let us remember that in the video where he taught how to imagine a transformer we start from the core section where we find the core section by measuring the segments and segments and multiplying them with each other and from then on we establish the whole formula or all the calculations that are used to invoke a transformer in this case we are not going to start Hence, simply by counting the turns that have been given in these, they lead to two of the secondary part and making a simple division, we can find out the number of turns per volt that has been searched for and with that value that we take we are going to do the two new coils then we are going to disassemble the transformer oh or no no and here we have already disassembled the transformer and as we can see here we have the three c Able that gives us 19 volts and over here we have the three cables that give us 29 volts each with a certain central we are going to cut these cables and we are going to first unroll this wire that I know is above and the one we do not need or the one we need change then we are going to cut we are going to unroll and the main point that we have to take into account is to count the number of turns or turns that this wing has been given that is the key to determine the number of turns per volt that is read then we will develop it will count and ah or not good here and we remove the wire that gave us 19 and we find it from one end to the center had 72 turn and from the center to the other end also had 72 spears in total 144 turns we are now going to do the same with this coil but remember that we are going to remove only one side the other side we are not going to remove because it is the one we are going to use for the output of the 29 no not you you iy Well, at that moment we already removed the other part of the coil, we removed 107 turns from this other part of the coil, we are going to leave it to them because it is the one that is going to give us the 29 volts that we need and with that wire we perfectly have the 3 amps we need, then we already have the number of turns or turns that each coil had in the case of the coil that gives us 19.5 volts we have 72 turns the same for the other part of the coil that also gives us 19.58 72 turns in the case From the coil that gives us 29 volts we have 107 turns or turns of alhama now to be able to determine the number of turns or turns that we have to give in the transformer so that it gives us these voltages we have to find the number of turns soccer as we go do let us say that the number of turns per volt is equal to the number of turns in each coil / voltage is giving us that coil in this case 19.5 volts that gives us the number of turns per volt io that is driving this transformer we are going to do it to also check with this voltage so the number of turns per volt is equal in this case 107 turns / the voltage that this coil is giving us 29 eights in this case of this operation it gives us 3.69 expires its turns and in this case it is not 3.68 turns as we can see practically it gives us the same value we are going to take any of these two values really the difference is only in tenths or hundredths now to find the number of turns or turns that we have to give In each of these coils we simply multiply the number of turns per volt by each of these voltages, we are going to say that this is secondary 1, secondary 2 and secondary 3, then we would have that the number of turns in secondary 1 is equal to number of turns per volt which is this value times the secondary voltage in this case it would be the number of turns per volt 3.69 turns per second voltage rio what would be 11 volts that gives us 40 turns and for the second coil we have that the number of turns in secondary 2 is equal to the number of turns per volt by the voltage of secondary 2 replacing values we have that 3.69 inspired per volt by the Secondary voltage of which is 17 volts note 62 turns then we are going to give 40 turns of wire or turn of wire to give us 11 volts and we are going to give 62 turns to give us 17 volts now if we find the core section of this transformer to find the power we are going to realize that this transformer is approximately 93 watts and knowing that power we can also realize that this transformer when delivering 11 volts is also capable of delivering up to 8 amps and at 17 volts it would be able to deliver us up to 5 above and at 29 volts it would be able to deliver us up to 3.2 amps but as in our case in these coils we do not need all that current because the ci circuits that are going to feed these voltages are circuits that consume less than one ampere really consume 600 700 to 800 milliamps so we really do not need to draw all the current that this transform can provide us for that reason in these two coils we are going to use calibers that are capable to provide us up to 1 for that we are going to use the following table to understand a little better all these calculations I invite you again to watch one of my previous videos where he taught how to mine a transformer there is also another video where he taught how to wind a central contact transformer are Very useful videos to be able to buy all these formulas a little better, then we are going to look at the table where it tells us which wire we can use to handle this current, this table, as well as the videos that I just mentioned, the links can be found in the description of this video this table simply has the data of this free the diameter of the a wire and the amount of current that each gauge handles then we say that we need a wire that handles approximately one npe we would then have that we can use a 23 gauge or a 22 gauge, either of the two would serve us for our transformer, well, we have the wire here, let's go to give first the 62 turns we need to give us 17 no, well here we already have the 62 turns we need to give us 17 volts we already have the 29 volt coil connects it to 17 now we are going to put the one that gives us 11 volts which are 40 thorns and you i ah and finally we have the 40 turns of the coil that will give us 11 volts or more are now going to sand a little tip of the wire to remove the enamel they have and power welding cables and finally only remains to assemble the transformer and measure the voltages ah yes 1 di 2 not ai me 2 good here and we already have ready our transformer coils have modified three coils the red wire and the black wire of the coil that gives us 29 volts the two blue wires are the coil that gives us 17 volts and the white wires are the ones that give us 11, then we go back to check that the voltages are correctly and we have it connected to the energy we are going to measure 29 volts 17 is correct and 11 volt those are the voltages that we needed those are the correct voltages good weeks friends that has been all for today I will wait for you in a next video
