Proximity sensor circuit using only 1 transistor

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Hello friends, today in this video I've shown a simple proximity sensor circuit using only one common transistor.
Components required for this project:
1 x BC547 transistor
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1 x 220 ohm resistor
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1 x 100 ohm resistor
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1 x Infrared led
1 x Photo diode
1 x Red led
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Alan Walker - Force
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