vcuauhtemoc
New Member
I'm making a circuit that takes in an audio signal, amplifies it, and outputs it to an LED which flashes in response to the audio signal. The current setup I have with the LM386 amp is working fine, but the problem is I plan to implement this into a pair of headphones, and the IC is getting power from a 9V battery which I would never be able to fit in the earphones. However, I do have a 3v 90mAh button battery which would work, but I can't figure out what the resistance should be between the IC and the battery. Currently with the 9V I have a 1K ohm resistor between the IC and the power.