In this, we have used the components given below, if you want to buy these components, then there is a link with the name of the components, you can buy from that link -
BC 547 transistor - https://amzn.to/2VPUF5s
9v Battery - https://amzn.to/3zsBCfU
100k Resistor - https://amzn.to/3gSssSH
Blue LED - https://amzn.to/3mDFyoY
This is its circuit diagram -
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