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 dubplates switch. Constructive data of the transformer depends on the magnitude of the input current.
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Socket in a lamp holder
To avoid running extra wiring for auxiliary electrical appliances when using a portable lamp, it is enough to fit a homemade adapter into the lamp holder, as shown in the figure.
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