| 摘要 |
A circuit for monitoring for the failure of one or more lamps in an indicator device, a segment type readout device, or the like. Upon failure of a lamp, a silicon controlled rectifier or a transistor switch is biased into a conducting state to energize either a back-up lamp or a warning lamp. A circuit may be included to flash either the back-up lamp, the warning lamp or a third indicator lamp in response to detecting the failure of a lamp. When the circuit monitors a plurality of lamps, the circuit can be adapted to deactivate all lamps upon detecting the failure of any of the lamps.
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