An alternating voltage, in contrast to a constant voltage, easily lends itself not only to a decrease, but also to an increase. For this, transformers of various designs have been used since the end of the nineteenth century.
Instructions
Step 1
Take any ready-made transformer that can be disassembled. Its characteristics may be such that are completely inappropriate for your purposes. The main thing is that it is suitable for only one parameter - power, and also must be designed for a frequency of 50 Hz.
Step 2
Disassemble the transformer. Wrap another winding over the windings on it, containing exactly one hundred turns. Collect it again.
Step 3
On the one of the transformer windings, about which you are guaranteed to know that it is mains, apply the mains voltage through a fuse, the rating of which is calculated by dividing the power of the transformer by the mains voltage.
Step 4
Connect a voltmeter to the temporary winding. Divide 100 by the measured voltage, and you get an important parameter of the transformer - the number of turns per volt. Write it down and label it as N.
Step 5
Disconnect and disassemble the transformer. Unwind from it not only the temporary winding, but also all other windings, except for the network one (it was wound last). Do not remove the insulation separating it from the rest of the windings. Please note that the mains winding of the transformer is now considered secondary instead of primary.
Step 6
The alternating voltage that you are going to apply to the primary winding, multiply by N. The frequency of this voltage should also be 50 Hz. You can get an alternating voltage with such parameters, say, from a battery, using a homemade push-pull key inverter of any design. Wrap a new primary winding over the insulation, the number of turns of which is equal to the result of multiplication. For this, use a wire of such a size that it can withstand the current through the winding. To find this current, divide the power by the primary voltage.
Step 7
Insulate the primary winding. Connect to the secondary load, then apply to the primary low AC voltage. The load should work.
