Circuit reducing possibility of TV tube implosion - pulses audio and visual alarms and breaks power supply when abnormal temperature rise occurs near neck of cathode tube

摘要

The device uses a sensor to monitor an abnormal rise in temp. adjacent the tube column, which might result in an implosion, or a consequent variation in the magnetic field. The sensor controls a switch which, in its normal state, charges a capacitor and energises a parallel relay from a 12v supply. The relay closes the television power supply circuit. The switch over of the switch by the sensor causes the relay to break the power supply circuit. The switch also connects the 12v supply to a parallel capacitor and relay through a pair of the relay contacts. When energised, the contacts switch the relay and capacitor to a lamp and audible alarm through which the capacitor discharges. When the relay switches back to recharge the capacitor, the lamp and alarm are energised.