An Excel-based, common-emitter and common-collector transistor amplifier calculator for high-frequency operation.

A capacitive T network calculator in S-math Studio.

A simple diode or the output of a transistor bias circuit can be used as a rough temperature sensor. For this purpose, a calibration procedure using a precise temperature sensor is recommended. This article shows how to calibrate such a temperature sensing circuit using an Arduino and the SHT15 Sensirion temperature/humidity sensor module.

My garden features a set of "garden lamps" which I turn-on at night.

Just in time for Halloween, an electronic candle driven e-pumpking project.

Can't find a replacement battery for an old cordless drill? Here's how to adapt a different battery to an old drill giving it a new lease in life.

A simple technique for measuring rotation speed in rpms using an oscilloscope.

How combining resistors affects the overall tolerance of the total resistance.

Building a simple ESR meter for troubleshooting electrolytic capacitors.

A Karaoke mixer and amplifier for the iPhone.