. Electronic apparatus for biological research . -^?'i/i- = JT Ci I y^ X c, ^ Figure Figure The Colpitt circuit requires one extra component and may be difficult to arrange if the frequency is to be adjusted by varying the total tuning capaci- tance. Its exponents claim for it an advantage over the Hartley oscillator which runs roughly as follows: In a Hartley oscillator there are in effect two 211

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