Method for linear transformation of effective values of alternating voltage at which signal of voltage of alternating current passes through heater of input thermo-transformer, the signal generated at the output of the thermo-transformer is amplified by means of amplifier, with application to basis of voltage repeater to emitter of which one connects heating element of input thermo-transformer. The signal of alternating current voltage is applied to input thermo-transformer, output signal from that one is amplified by means of direct current amplifier, with application of that to input of reversing thermo-transformer, in few cycles one realizes alternating replacement of the input and reversing transformers by means of two switches. Resulting value of direct voltage is found by means of multiplication of voltages of the second and the first thermo-transformer in the first and second cycles, respectively.
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