I’ve nearly finished a project that I’ve been working on, and now it’s time for me to pop out the chip and run it on its own. It’s working just fine when connected to a 9v battery through a voltage regulator, but I really need to connect it to wall power. When the chip is in the Arduino board, connected to the wall wart that came with it, it works just fine. However, when I connect the power supply to the voltage regulator and capacitors that I’ve been using (per the instructions for “standalone” atmega168 on the playground), the unit just flickers on and off intermittently. I’m using the 7805 voltage regulator, but I’ve noticed that the Arduino board itself uses an MC33269D-5.0 IC to regulate the voltage. Would using an IC like this solve my problem? I assumed it was the voltage regulator, but is there something else I should know about?
Also, the schematic of the Arduino Decimilia shows two of these ICs-- would I need both of them? Or is one of them regulating the “VIN” input?