Hi,
I'm trying to build an edge detector using a flip flop. Basically, I want a relay to activate for about 1s an input signal rises and when it falls.
I'm having a hard time implementing the 1s delay using an RC circuit attached from the output of the flip-flop and fed back into its own clock pin..
Something like this: http://tinyurl.com/ttxztto
the circuit works and does exactly what I need in the simulation (other than I have to change the cap/resistor values to get 1s). But it works differently in real life. Because I have to add a pull-down resistor on the clk pin and that messes up the RC circuit I think because that creates a voltage divider. I don't know enough at that point... Can someone point me in the right direction?
Thanks.
I'm trying to build an edge detector using a flip flop. Basically, I want a relay to activate for about 1s an input signal rises and when it falls.
I'm having a hard time implementing the 1s delay using an RC circuit attached from the output of the flip-flop and fed back into its own clock pin..
Something like this: http://tinyurl.com/ttxztto
the circuit works and does exactly what I need in the simulation (other than I have to change the cap/resistor values to get 1s). But it works differently in real life. Because I have to add a pull-down resistor on the clk pin and that messes up the RC circuit I think because that creates a voltage divider. I don't know enough at that point... Can someone point me in the right direction?
Thanks.