Electron coupled oscillator
The electron-coupled oscillator (engl. Electron-Coupled Oscillator , abbreviated as ECO ) is an electronic circuit for generating AC voltage .
functionality
The ECO circuit is a variant of the Hartley circuit . The resonant circuit with L1, L2 and C1 is connected between gate and source. The field effect transistor (FET) Q1 in drain connection has a phase rotation of 0 ° and a voltage gain of less than 1. The two inductors L1 and L2 work as a step-up autotransformer . The gain is determined by the ratio of L1 to L1 + L2. A gain of at least 1 is required to maintain the oscillation. For a clean output signal without harmonics , the gain should only be so large that the oscillator starts to oscillate safely. The circuit shown oscillates at approx. 7 megahertz. The output signal of the oscillator is decoupled with C2.
Radio amateurs used the ECO circuit with an indirectly heated pentode for shortwave - Audions .
literature
- W. Benz, P. Heinks, L. Starke: Book of tables electronics communications engineering . 2nd Edition. Frankfurter Fachverlag, Frankfurt 1980, ISBN 3-87234-065-4 .