…is necessary for anyone who makes anything out of metal. But where to take it? Turns out it can be made from a piece of old rail. It is enough to cut autogenous cutting unwanted parts, adding the procurement of the required form, and get to work.
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The voltage is from 1 to 12 In intervals of a single oxen allows to obtain a transformer, the circuit of which is shown in the figure. If desired, the switching is easy to implement...
