Make a metronome

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When you're playing in a band, going a little out of tune is forgivable but if you lose timing the whole thing falls apart. To help your timing why not try this metronome project?

Electronic parts needed: A 555 IC, 3x 1K Ohm Resistor, 2x 22uF 16V Capacitor, a 9V Battery, an 8 Ohm Speaker and a 250K Ohm Potentiometer. The tools required depend on how you want to put it together: in the project the guy uses a breadboard (no soldering required) but you could use a copper board and solder it together to make a more permanent item.

Link: Metronome project