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Doesn't the click from the relay provide an audible notification, before the bubble notification?If this is the case, you can simply swap the AC pump for a DC one and the relay for a transistor.
DIY Platform Bed Substitute - Out-Of-The-Box, Portable, Lightweight & Inexpensive
How to make a shelve with a stop sign
A fully 3D printable GlaDOS Robotic ceiling arm lamp
Make a useful Rotating Mount for any Camera
Simple Vault Mechanism
Simple presentation clicker