Three different routes:
- Pre-made IC, the SKC
- Or, do an AVR version. Which, of course, someone beat me to.
- But, it should definitely not be too tough with discrete components that has:
- Speed control (5, 10, 15, 20, 30, 40 wpm ?)
- No memory needed.
- ...
panoptic.com/rking/Iambic+Bug
Three different routes: