This may be a stupid question, but is the 9V input for that circuit absolutely necessary?
I am teacher looking for a simple breadboarding project where an electret microphone lights up an LED. We are in a computer lab, so I was going to use the computers' 5V USB outputs to power the circuits we work on to save money on batteries.
I feel like I've built circuits in the past where an LM386 worked on 5V, so I'm wondering if values can be changed to get the whole circuit to work with 5V power. I'm far from an electronics wiz, so please let me know if this is a pipe dream.
Thanks,
Kurt