Hello Everyone,
First of all, thanks for all the great posts and responses that have helped me get this far. I've been reading on the forums here for a while, just not chiming in to get some assistance and hopefully get to the point where I too can contribute to the community.
I'm trying to create a simple stop-watch style circuit using the SE555P timer and a couple 4026 Decade Counters - to drive two 7-segment LED displays to show the seconds only (counting up to 99 seconds).
I've done a tone of reading, researching and have come up with this circuit for the SE555P, in astable multivibrator format.. but, for some reason.. when I'm connecting it to the 4026 I am NOT getting a consistent second pulse. I will get a reading of 1,2, 4, 1.. and then just randomly changes between those numbers. Obviously I could have an issue with the 4026 connections that I've made - but they are all based on the spec docs for the IC and the LED...
Could really use some help, at first, just to get the 555 dialed in so I know it's generating the required pulse frequency and then I can move onto the other parts of the chain.
Here is my goal : To create a stopwatch that starts at the push of a button, stops at the 2nd push and clears/restarts at the 3rd,.. so there is only one NO button connected to init the count - not shown in my attached diagram as I'm just trying to get the freq. right.
Would love your feedback on any changes that need to be made to the circuit. Where to interface the momentary button to start/stop the counter and any values that you see should be changed
Thanks again!
HERE IS A LINK TO MY 555 DIAGRAM: https://www.dropbox.com/s/qrilc5rcareate8/555-timer.jpg