Great tutorial on Instructables on building your very own bubble machine with what's sitting around the house, some glue and a couple of screws.
With basic electronics of just a fan and a motor, a bubble machine is also a really easy first electronics project. This one I threw together with spare minutes here and there across the period of a week. The longest part was waiting for the fan to arrive from Amazon, the best part was making a lot of mess in the Instructables office before realising that the shower would be a better place to blow bubbles while testing.
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