I constructed a counter circuit with: 555(astable-pulse generator), cd40192-decade counter, cd4511(bcd/7-segment driver) and 1 section of a double 7-segment LED display. The problem is that the counter sometimes sits down at zero and refuse to count up and atimes it would randomly display figures that does not correspond with the original count (i.e it displays: 7, 2, 5, b and inverted b).
I used a separate LED to monitor the pulse from the 555.
cd4026
cd4033
cd40162
are all difficult to source from the local market in my resident town.
I used a separate LED to monitor the pulse from the 555.
cd4026
cd4033
cd40162
are all difficult to source from the local market in my resident town.