I'm always looking for interesting electronics kits with a music or audio based theme. I've recently started an online shop selling a basic electronics kit, the Posc pocket oscilla …

I'm thinking about putting together something simple for my young son's soccer team. I'd like to build a simple circuit that could be placed on/underneath the laces of their shoes …

How do I detect the pattern of the knock on a door, and use it as a signature to unlock a door?

I'm trying to control a DC (pager) motor with a sound signal so that I can use an audio synthesizer to control the speed of the motor. I'm hoping to modulate the speed of the motor …