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Stojan G. Manolev

Publications and source records attributed to Stojan G. Manolev.

5 recordsLinked to original sources
arXiv2023

Charging of capacitors with double switch. The principle of operation of auto-zero and chopper-stabilized DC amplifiers

The problem given to the 10 Experimental Physics Olympiad (EPO10) 7 December 2023, Skopje, 11:00-15:00. The Olympiad is organized by Society of Physicists Macedonia and the Sofia Branch of the Union of Physicists in Bulgaria. The experimental set-up illustrates the principle of chopper stabilized DC amplifiers described in the patent by Edwin Goldberg and Jules Lehmann, Stabilized direct current amplifier, U.S. Patent 2,684,999 (1949). Now this principle is implemented in many contemporary operational amplifiers. In such a way this student problem is related to the operation of widely used technical device and many participants successfully solved the problem.

physics.ed-ph↗
arXiv2019

Determination of Boltzmann constant by equipartition theorem for capacitors

A new experimental set-up for Boltzmann constant measurement is described. Statistically averaged square of voltage $\left $ is measured for different capacitances $C$. Boltzmann constant is determined by the equipartition theorem $C\left =k_{_\mathrm{B}}T$. 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.

physics.ed-ph↗
arXiv2016

Measuring the speed of light with electric and magnetic pendulum

This problem was given at the Fourth Open and International Experimental Physics Olympiad (EPO4) Day of Light on 23 April 2016 in Sofia organized by the Sofia Branch of the Union of Physicists in Bulgaria and the Society of Physicists of the Republic of Macedonia, Strumica.

physics.ed-ph↗
arXiv2016

Measuring Plank constant with colour LEDs and compact disk

This problem was given on the Open Experimental Physics Olympiad (OEPO) "The day of the photon" on 25 April 2015. The Olympiad was a part of the celebration of the International Year of Light (IYL) http://www.light2015.org/Home/Event-Programme/2015/Competition/Bulgaria-Second-Experimental-Physics-Olympiad--25-April-2015-in-Sofia.-The-Day-of-the-Photon-in-the-International-Year-of-the-Light.html and was organized by the Sofia Branch of the Union of Physicist in Bulgaria and the Regional Society of Physicists of Strumica, Macedonia.

physics.ed-ph↗