I am building a science project for my friend. We chose to make a VU Meter.
I am planning to make the Vu Meter as the schematic in the image:
The audio source will be 3.5mm jack output of a smartphone.
I am getting all the components except the c9013 transistor at local shops.
So can I use the 2n2222 transistor instead?
If not then suggest the changes to make it work.