Circuit Project Electronic

I have a set of noise cancelling headphones at work. The active part does a nice job on the building ventilation and computer fans, and the passive part on my co-worker’s phone conversations. I didn’t like the idea of wasting batteries, though, and the system didn’t seem to like even NiMH rechargeables. So, I decided to run them off the USB port.
The USB port can supply 5V, but I needed the ~1.5V that a single AAA will supply.

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Read More Source:
http://www.instructables.com/id/S9G7OD7F0X27XG7/
Thank you.