Interfacing keypad to VHDL to produce tones

Circuit board stacks of four or more layers often have through vias that attach to pads on layers where there is no electrical connection. Should those non-function pads stay, or should they go? This article presents the problem and provides resources.

Insight into the November ARM conference and advice from Mike Muller, ARM's CTO, on how to be successful with the IoT.

Aluminum electrolytic capacitors have a reputation as having a short life expectancy and being unreliable...but are they really that much worse than other types of capacitor?