Automatic emergency lamp circuit

Posted on Mar 28, 2007

Automatic emergency lamp circuit It shows the electronic switch integrated circuit of automatic emergency lamp circuit. Made into the circuit with automatic emergency lights in

Automatic emergency lamp circuit
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Bai Tianguang line it does not work enough, when the light is low light automatically at night. The circuit shown in Figure 1148, primarily by the power supply circuit, light control circuit, and the like of the electronic switching circuit. During the day or light intensity is high, phototransistor VSL resistance value is small, the transistor VT1 is off, the subsequent circuit does not operate, licensing EL lamp is not lit; when the light dimmed to night. VSL resistance value is increased, the transistor VTI base sufficient to promote its conduction voltage value, after the opening stage circuit starts to enter the work state, the electronic switch integrated circuit inside the electronic switch is turned on, the lamp EL light.

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