| 摘要 |
Frequency-selective indicator in which, for implementing a particularly simple structure and low power consumption, in which the light-emitting diode (LD) of an optocoupler (OK), together with a parallel-connected oppositely polarised reverse-current diode (RD) in series with a frequency-selective resonator (L, C, Q) is connected into a circuit carrying the frequency to be indicated and the phototransistor (FT) of the optocoupler (OK) is used for controlling an indicating circuit. <IMAGE>
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