CW Transmitter for 40,30 and 20m band. By Kevin Loughin - KB9RLW and Harry Zachrisson - SM7PNV
Open Hardware, Open source software. Schema, Bill off materials and Gerbers can be found in the Hardware folder. Source code for the Arduino IDE is in the Sofware folder.
The hardware was designed using EasyEDA and is shared as a public project here: https://oshwlab.com/deBug/cw-flea_copy
General documentation and how to operate it can be found here: https://www.zachtek.com/1038
Buy it built and programmed here: https://www.zachtek.com/product-page/cw-flea-transmitter
//Harry