Monday Kids Colorful LED Candle Circuit DIY Kits

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  • Brand Name: Monday Kids
  • is_customized: Yes
  • Working Voltage: 4.5V to 5.0V DC
  • Size: 45mm x 31mm

The design inspiration of this candle circuit is from our lives. In our birthday party, we need to light the candles with a lighter and after making the wish we blow out the candles. This DIY circuit acts like the same way. As we can see from the circuit schematic, the whole circuit is composed of two sub-circuits, one is the audio amplifier circuit which is formed by a 9013 NPN transistor and a 9012 PNP transistor while the other is the switch circuit which is formed by a photodiode and a 9012 PNP transistor.

The working process of this circuit is as below:

In a general night, apply a 4.5V to 5V DC power to the circuit, nothing would happen until an ignited cigarette lighter is approached to the photodiode, the colorful LED light will start flickering. When you blow toward the mini microphone, the LED will be turned off.


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