Make a simple LM386 audio amplifier that you can use with most radio related projects. I use it as a ...

Basic multi-z antenna tuner for QRP. The idea is to use it with my 40m EFHW antenna wire and some ...

The 49:1 impedance transformer is the heart of any EFHW antenna you will build… most of the time. It doesn’t ...

Build a simple LC passive CW audio filter with only four components. You can always turn it into an active ...