CW Lambic keyer using ATTiny 13
ATTiny 13 is an 8-bit Microcontroller with 1K Bytes In-System Programmable Flash, which is just enough for Lambic Keyer project
MORE INFORMATION ON CONSTRUCTION IN LINK
https://electronics-hobby-cirucits.blogspot.com/2024/01/diy-cw-keyer-for-ham-radio.html