Velleman KNS120 Manual Del Usuario página 6

User manual
LED (Light Emitting Diode) Circuit symbol
Light Sensor is a device that reacts to light. There are different types of light sensor. The one used here
is a phototransistor. When there is no light, electric current cannot pass through it. And therefore it is
like a switch that is switched off. When there is light falling on it, electric current can pass through it. It is
then like a switch that is switched on. This way a light control circuit can be made.
Circuit symbol
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