What's a good circuit to use to generate a square wave? The exact waveform isn't too important - I just want to get a piezo buzzer cranking at 150 kHz. I also want efficiency and a …

I'm putting together a design for a hardware random number generator that will utilize multiple sources of entropy (combined): Ambient light Ambient sound (and sound levels) Ambi …

I'm interested in a hand powered generator similar to the one in this Gakken Helicopter Kit. http://www.makershed.com/ProductDetails.asp?ProductCode=MKGK24 Are these easy to com …