| 摘要 |
A high brightness mobile video system includes a standby circuit for maintaining a low CRT filament heater circuit current from a battery supply. The standby circuit monitors an input circuit for video signals. On receipt of a video signal, the standby circuit operates a relay to energize a switch mode power supply which further energizes the deflection circuit for the CRT, couples full operating current therefrom to the filament heater circuit, and enables the CRT video drive circuits.
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