Make a buzzer from a cheap relay…

If you have a relay from Radio Shack (Part #275-206 or similar), you can quickly form it into a buzzer with a DC power source. Remove the plastic housing so the connections are exposed (and you can clearly see which terminal is connected where.

Connect one coil terminal to ground (black battery wire), the other coil terminal to a place that connects to the clicker when not powered (rest position).  Connect power (the red wire) to the clicker.

Can you find the spot where you get a nice zap when you touch it with your fingers? (Note – you may need more than 3V to make this work with your particular relay.  Try 9 or 12V.)

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