To get the best power transfer into an antenna, tuning is required. This process uses a load to match the transmission line to the antenna, which controls the standing wave ratio (SWR). [k3ng] built ...

The purpose of the project is to spoof a simple low frequency 125kHz RFID tag with the use of an Arduino and only a few components. A single Arduino pin provides the control once tag is assembled and ...

[Martin] sent in a great guide to a simple Arduino based theremin. It’s a very small build – just a single common IC and some passive components – and easy enough to build in an afternoon. The ...