Way back when [Ms Ellsworth] was a kid, she kept seeing the same circuit over and over again in her various op-amp books. It was a Wien bridge oscillator, a small circuit that outputs a sine wave with ...

TP-Link's sub-brand Tapo isn't, perhaps, the biggest name in the smart home market at the time of writing, but products like this nifty Smart Wi-Fi Light Bulb will do plenty of work to raise its ...