In 2014 I achieved my master degree, with the thesis about digitalization of an analogical governor. of a Francis hydraulic turbine of a sincronous electric generator of 170000 kW. Any one can examine and download this thesis at www.uff.br/mcct. Choose "Documentos/Teses", then "Dissertações", and finally number 15, "Modelagem e Digitalização de Regulador de Velocidade. Eletônico-Analógico da Década de 1960 de Turbinas Hidráulicas Francis de Gerador Síncrono". Unfortunalelly it is written in Portuguese but who else can understand Spanish, will not have problems to read it. The electronic interfaces between arduino and signals with operacional amplifier 741 are under a request of patent in Brazil.