5 Volt Regulated Power Supply
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Many PIC's require 2V-5V to operate - some need at least 4.5V. For the low voltage types, two AA cells (~3V) works fine. For those that require 4.5V, or if you need more voltage for other parts of your project (i.e. motors), then you'll need this circuit:
Powered by a 9V battery, the cheap 7805 voltage regulator (35 cents at Jameco, if the link stops working) will provide a steady 5V source for your circuit. The only other important component needed is a capacitor on the output to soften current spikes and prevent brownouts - the value is not critical, as long as it's above 10 uF or so.
