CW adapter for HBR4HF and BritX

This design using Atmel ATTiny13 microcontroller with 1KB flash, this flash is more than enough to handle the duty to generate 700Hz tone and handle PTT delay. ¬†Actually using 555 is also possible to build the interface but using microcontroller give alot of option and possible “future feature”

*. ATTiny13
*. Digitally 700Hz tone generator
*. adjustable PTT off delay time

Hambuilder Team