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Bead-type emergency light circuit 2
Source: InternetPublisher:fish001 Keywords: Emergency lights TI BSP Updated: 2021/04/15
When the mains power is normal, the transistors VTi and VT2 are cut off, and the bead bulb EL does not light up. When the mains power fails
, VTi is turned on by obtaining the base bias voltage from the battery through resistors R2 and Ra, Vtz is turned on, and the lamp EL lights up automatically.
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