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Bead-type emergency light circuit three
Source: InternetPublisher:李商隐身 Keywords: Emergency lights triode TI Updated: 2020/08/15
When the mains power is normal, the transistor VTi is on, VTz is off, and the bead bulb EL does not light up. When
there is a power outage. VTz gets the base bias voltage through Ra and turns on, and the lamp EL lights up automatically.
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