| 摘要 |
A loop detector circuit includes a cross-talk monitor to detect if the loop detector is detecting the field of another loop detector. A voltage threshold detector (4) can be connected via a switch (3) to a loop (1) and a frequency selector arrangement (6, 7, 8), and is operative to illuminate an LED (5) when cross- talk is present to enable a frequency at which no cross-talk is detected to be selected. <IMAGE> |
