The quiz is about the piezoelectric effect and its application in crystal oscillators.
Take your chance and win one out of eight Evaluation Boards that enable you to test oscillator in a quick and easy way!
Take part and try your luck until the end of February 2023. The winners of this quiz will be informed on the 1st of March 2023 via email. The quiz was prepared by Distrelec and Würth Elektronik, and the data collected through respondents will be only used to select the winner. To win you have to get all your answers correct and fill the quiz the quickest.
*For some hints in order to answer the questions check out the Würth Elektronik eiSos portfolio of Quartz Crystals & Oscillators and IQD page here.
Great minds in the past – Great Minds today: Challenge yourself!
#2 Jacques und Pierre Curie
The brothers Jacques and Pierre Curie were French physicists and discovered piezoelectricity in 1880 (yes, that’s the same Pierre Curie, who together with his wife, Marie Curie discovered Radium in 1898). The first crystal oscillator wasn’t built until 1917, and the first quartz crystal controlled crystal oscillator was constructed in 1921.
Jacques, born in 1855 in Paris, and Pierre, born in 1859 in Paris were sons of (medical) doctor Eugène Curie (1827-1910) and his wife, the manufacturer’s daughter Sophie-Claire Depouilly (1832-1897). Both were privately educated by their father and didn’t visit a public school. Both earned degrees in physics and worked together at the School of Physics and Chemistry in Paris, where they then discovered the piezoelectric effect in 1880. Pierre died early in 1906 in a traffic accident when he fell under a horse-drawn vehicle. Jacques later became Professor in mineralogy at Montpellier university and died in Montpellier in 1941.
Early alternatives to the quartz crystal oscillator involved inductive capacitive circuits. Here the values of inductance and capacitance would change with temperature, humidity, atmospheric pressure and age to such an extent that a radio could not stay tuned. A radio operator would be employed full time to manually adjust the capacitor plates and keep the carrier frequency correct. The invention of the crystal radio circuit leads to the phrase “crystal clear”, such was the excitement of the new radio technology.
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