First, thanks to those that helped me with my previous question about how to make a 555 emit a short, single, positive pulse upon power-up.
Now...my project also requires using the same 555 to give a short, single, negative pulse to trigger another 555 (which is in flip-flop configuration) to 'on'.
I thought a capacitor in series with the output of the first 555 to the trigger of the flip-flop 555 would give the latter a short positive pulse and then a negative pulse as the first 555's timing cycle finishes, and this positive-to-negative voltage change would flip the second 555 to 'on'. (This has been done in 2 instances previously in this book...so I'm hoping this is the solution).
But I tried it and my circuit doesn't work properly. The negative pulse to the flip-flop 555 should be short...maybe it's being held too long?
Now...my project also requires using the same 555 to give a short, single, negative pulse to trigger another 555 (which is in flip-flop configuration) to 'on'.
I thought a capacitor in series with the output of the first 555 to the trigger of the flip-flop 555 would give the latter a short positive pulse and then a negative pulse as the first 555's timing cycle finishes, and this positive-to-negative voltage change would flip the second 555 to 'on'. (This has been done in 2 instances previously in this book...so I'm hoping this is the solution).
But I tried it and my circuit doesn't work properly. The negative pulse to the flip-flop 555 should be short...maybe it's being held too long?