Build a “Truth Meter”; A Simple DIY Lie Detector [Electronics]

One element of lie detection, as carried out by lie detecting machines, is the measurement of galvanic skin response–how sweaty the questioned person becomes. This simple electronics project recreates that measure right in your workshop.

Build a PVC Didgeridoo to Jam Out like an Aborigine [Weekend Project]

If the warm weather has you itching to open the garage door and get tinkering, this PVC didgeridoo–a 1,500 year old aboriginal instrument–is a fun (and noisy) way to kick off a summer of tinkering.
Didgeridoo’s are an ancient instrument that is at minimum 1,500 years old–probably much older but the first rock art depicting the use of one appears around 500 AD. The instrument is essentially just a resonance tube the player uses to generate music that sounds like a deep and rhythmic humming. You can hear a traditional