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Hey, look up the NE555 chip. It's tiny and I know it from this build that is kind of a stress-test for soldering skills. It's a timing chip, so depending on which of the little legs you connect the LED to, those will blink with different frequencies. Up to 5 different frequencies are possible, but I'm not sure you can put more than one LED on a given leggie without transistors inbetween. You'll need to check the power draw against the NE555 Datasheet.
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