Desde 1926
Tentando usar a fonte de corrente para aumentar a eficiência:
Escolhendo um transistor BC550B, o ganho de corrente hFE mínimo seria de 200, o que significa uma corrente de base IB de 10µA.
Então:
Usaremos R1=100kΩ e R2=120kΩ
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show de bola!!
Obrigado Josué!