w2aew | #228: Radio Fun: Michigan Mighty Mite CW transmitter and a low pass filter @w2aew | Uploaded January 2016 | Updated October 2024, 1 hour ago.
The Michigan Mighty Mite is a very simple crystal controlled CW transmitter that uses very few parts, is easy to build, and a fun little ham radio project. Simplicity comes at a price, and that price is harmonic distortion. A low pass filter is shown that helps to dramatically reduce the distortion. This Mite is built with a 3.579MHz "color burst" crystal. Inspiration for building the Mighty Mite came from the Soldersmoke blog and podcast. More information can be found at the following links:

Lots of pages on the Michigan Mighty Mite:
lmgtfy.com/?q=michigan+mighty+mite

Soldersmoke blog posts on the Michigan Mighty Mite:
soldersmoke.blogspot.com/search/label/Michigan%20Mighty%20Mite

ELSIE Filter Designer software:
tonnesoftware.com/elsie.html

Jim Tonne has a number of GREAT tutorial papers on his website, including a top-notch filter tutorial. See here:
tonnesoftware.com/miscellany.html

Toroid design page:
toroids.info