I’m sitting at a table writing this in the centre of a long and cavernous industrial building, the former print works of a local newspaper, I’m surrounded by hardware and software hackers ...

The clock output (pin 10) of the CD4047 is connected to the clock input (pin 14) of the 4017 IC. LED1 blinks to confirm that the CD4047 is clocking properly. One end of the nine wires to be tested is ...