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        <description>Blue Tester

Premessa

Sul numero di marzo 2015 di PC Professionale esce un articolo che mi svela la nascente attenzione sulla la luce blu emessa dai LED (quindi potenzialmente da tutti gli schermi moderni di TV, tablet, smartphone, ecc) perchè pare che le quantità innaturalmente emesse da questi dispositivi possano creare danni agli occhi e non solo. La luce blu nell'illuminazione a LED è fondamentale per poter creare la luce bianca, e riuscire a realizzare LED su questa lunghezza d'onda è stat…</description>
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Elettronica Variled a singolo transistor Telegrafino Blue Tester Termo-Ikea Biologia</description>
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Ovvero un telegrafo con Arduino

L'apparecchio proposto è stato ispirato dai telegrafi interattivi visti al Museo della Scienza e della Tecnica di Milano.
Si tratta di un giocattolo dimostrativo che permette di creare segnali con il codice Morse, e di vederli tradotti automaticamente su un display.</description>
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        <description>VariLed a singolo transistor


18/04/2014

 
 
 
 
 
 
 
 
 
 Il semplice circuito qui descritto è nato dalla necessità di dotare di un sistema di illuminazione moderno il mio microscopio Meopta degli anni '80, che funzionava con la classica lampadina ad incandescenza (6V/15W nel mio caso).
Quel tipo di illuminazione ha parecchi difetti (è grossa, consuma, scalda, richiede accorgimenti ottici particolari, e soprattutto un alimentatore esterno) ma del resto fino a pochi anni fa non c'erano altern…</description>
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