  A new experimental set-up for Boltzmann constant measurement is described.
Statistically averaged square of voltage $\left<U^2\right>$ is measured for
different capacitances $C$. Boltzmann constant is determined by the
equipartition theorem $C\left<U^2\right>=k_{_\mathrm{B}}T$. For fixed
capacitance, voltages could be measured for different temperatures. The set-up
consists of low-noise high frequency operational amplifiers ADA4898-2. An
instrumental amplifier is followed by an inverting amplifier, square of the
voltage is created by an analog multiplier AD633 and finally the averaged
signal is measured by a multimeter.
