Building an RF power amplifier from scratch is one of those projects that sits at the intersection of analog electronics, thermal engineering, and practical RF know-how — and it's rarely tackled in beginner-friendly content. This video from ASSISTEC LABPROJETOS walks through the construction of a homemade 40W RF amplifier for the FM broadcast band, built around either the 2SC2540 or M1104 RF power transistors.

What makes this worth watching is the depth: amplifier projects at this power level require careful attention to impedance matching networks, low-pass filtering to suppress harmonics, heatsinking, and bias setting — none of which are trivial. The 2SC2540 in particular is a classic VHF power device, and seeing it driven in a real homebuilt circuit gives viewers a concrete reference for component selection, PCB layout choices, and tuning procedures.

For anyone interested in amateur radio transmitters, RF design fundamentals, or simply how a few watts of input become tens of watts of clean output, this hands-on build offers more practical insight than a typical theory lecture. The video is in Portuguese, but the schematics, component shots, and measurements translate easily for technical viewers.