| 摘要 |
A signal system includes a switching element which is turned on or off in response to an electrical signal. The signal system includes a field effect transistor which is arranged such that the drain current does not change in response to a variation in voltage across the source and the drain of the transistor, whereby every signal is applied to the switching element when a circuit voltage is applied to the switching element while a signal is prevented from being applied to the switching element when a circuit voltage is not applied to the switching element.
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