| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic tuner, from which the occurrence of such a problem that a voltage-controlled oscillation circuit stops oscillations, causes parasitic oscillations, and the like, due to the excessive dropping of the Q of a resonance circuit is eliminated. SOLUTION: Relating to an electronic tuner provided with a voltage- controlled oscillation circuit VCO which controls a parallel resonance circuit using a variable capacitance diode with a tuned voltage, the Q-value of the resonance circuit is prevented from dropping by limiting a tuned voltage to a prescribed positive value or higher by connecting a diode 24 between the tuned-voltage supplying line 20 to the oscillation circuit VCO and a voltage supplying line 28.
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