Dark sensor using transistor, phototransistor and photodiode

Description: This versatile dark sensor is made up of two transistors. It is a versatile module, because you can use it for testing several electronic components, such as, relay, reed switch, light dependent resistor(LDR), electret microphone, phototransistor, photodiode, etc. Besides, you can use this module for making simple clap switch, light operated switch, water level…

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