Rainbow Tuner + SWR Bridge
(Click photo for larger image)
The Rainbow Tuner is the popular N2CX-designed resistive-type SWR bridge that displays the relative SWR by illuminating combinations of colorful LEDs. It handles up to 5W RF power and includes a tunable parallel resonant circuit ("ATU") using a tapped inductor that readily tunes an end-fed half wave antenna to cover 7.0-10.16 MHz. When assembled, pc board mounts nicely in an Altoids mint tin, included in the kit!
Although the kits are sold out for this year's run of the project, you're of course encouraged to homebrew your own version by following the schematic, parts layout and plans contained in these web pages.