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LAMP_BURNOUT_ALARM

2016-08-10 13:49  
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LAMP_BURNOUT_ALARM
Used when photocells and lamps are employed to detect end of magnetic tape, lood point, or bad spot.Failure of lamp can cause serious trouble in magnetic tape handler. With circuit showm, when lamp burns out, transistor can no longer energize relay, and relay contact doses to actuate alarm at computer console.-J. E. Kienle and R. W. Wooldridge, Photocell Lamp Burnout Warning Circuit, EEE, 10:8, p 27-28.