Rab18’s Weblog

The four inputs a, b, c and d on the 4511 connect to ground via four black cables (these can be seen in the previous entry) this gives the inputs a low reading. When these cables were removed the voltage pulls up through the 10k resister to the 4.5v and gives a high reading (1). Using these cables I was able to work out using a truth table how to count 0 to 9.