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Bob Knetzger

Bob Knetzger

Bob Knetzger ([email protected]) is an inventor/designer with 30 years of experience making fun stuff.

Latest from Bob Knetzger


Suppose you wanted to build electronic dice for a board game. Sure, you could use discrete components to build a clock circuit into a decade counter and BCD to 7-segment decoder, etc. Or you could write some random number generating code. That’s obvious and has been done before. But professional... Read more »


My son was frustrated that the original battery cover on his Lotus Elise sports car wouldn’t quite fit over his new, larger battery. It was the perfect opportunity to try out my new strip heater by making a new cover. Read more »


Reminisce about the melodic toys of yesteryear and learn how to make your own. Read more »


Perhaps the most iconic 80s music toy was the Magical Musical Thing from Mattel. The TV commercial featured a kid playing melodies with one finger on the toy’s keypad strip — and finishing by playing it with his head! Now you can make your own custom version! Read more »

hummingbird feeder.2

Stop ants from getting into your hummingbird feeder with a DIY moat. Read more »

Fig. F: Flip!

Make your own custom shaped cookie cutters two ways: either traditional aluminum or vacuum formed plastic. Read more »


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