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here is an example of making some DIY lab equipment (lab scissor jacks, retort stands, clamps etc)https://www.youtube.com/watch?v=Uoxg174OHq0
check this out
check this out for a easier 3D printed version
Here is my take on the 555 timer motor controller, this shows how to go about modification of the circuit, and how to avoid needing the PCB (can just use veroboard)https://youtu.be/61zSytXWH4U
Here is my version, made with 3D printing, still a puzzle box, but this version gives a few clues to make it easier, and is designed to be a novelty gift box, rather than just a puzzlehttps://www.youtube.com/watch?v=wd8GBqPiLUU
Impossible Dovetail Novelty Gift BoxView Instructable »
here is another puzzle gift box (can put money inside as the gift or prize)
"Impossible Dovetail" Novelty Gift BoxView Instructable »
Here is my version, has a ultrasonic sensor to turn the light on, and a timer to turn the LED off after a set time. Also, uses joule thief type circuit so that on single AA battery needed.
Here is my version using an ultrasonic sensor to turn the light on (and then a timer turns the LED off after a set time) - it also has a joule thief circuit incorporated so that only a single AA battery is needed
Here is my version using an ultrasonic sensor to turn the light on (and then a timer turns the LED off after a set time)
Ultrasonic NightlightView Instructable »
Here is a way of using an old analog oscilloscope with a webcam to get digital storage oscilloscope type functions (well at least, basic DSO functions): http://www.fadstoobsessions.com/Downloads-Products/Webcam-Oscilloscope.phpYouTube link for demonstration of features. https://youtu.be/Df9Vid53Hg8