- Changed to Schmitt-Trigger ICs
- Added pull-down resistor to Clock Enable
- Fixed State machine reset circuitry.
- Fixed Sate machine LEDs.
- Update chip names in schematic
- Fixed some vias in pads.
- Greatly simplified state machine & clocking:
- State machine is now based on a shift register.
- Now clocking state machine on falling clock and registers on rising edge.
- Enables conversion in only 9 cycles.
- Moved to smaller, 2 layer PCB.
- Added mounting holes.
- Added ground test point.
- Changed to 0603 LEDs
- Fixed missing ground on debouncing of step button.
- Slightly adjusted value of passives around clock.
- 1M trimmer with knob is more easily available than 5M trimmer.
- Initial Prototype