| 摘要 |
<p>The rotary channel selector switch is used for a television receiver with a tuning circuit including a variable capacitance diode, controlled by the applied DC voltage. This is formed by a voltage corresponding to a given channel, combined with an automatic correction voltage. The switch comprises a substrate carrying two concentric conductor paths (1, 2) and a surrounding set of conductive zones (3, 4) the two paths (1, 2) coupled to respective terminals of the correction voltage generator and the conductive zones (3, 4) alternately coupled to a variable DC source and to the outer conductor path (2). A rotary cursor has a radial conductor (4) element coupling one of the conductive zones coupled to the DC source to the inner conductor path (1), in dependence on its angular position.</p> |
