I finally made plates for the registers module. The toughest part of making them was applying and developing photoresist.

I also got 40 new custom relays ($2.3 each, including shipping) from China. Every relay is supposed to have white control LED. But I haven’t tested them yet.

I’ve corrected the clock generator. Now it makes 3 ticks per second. Full cycle consists of 2 ticks. Therefore clock frequency is 1.5Hz. I used R = 100 Ohm and C = 330 uF for delay circuit.