well if the pulse is less then 1500us the clock works fine, and will stay at 1500us. but if the pulse is longer then 1500 us, the clock follows the incoming signal and doesn't go low until the pulse goes low.
This is just a quick drawing of it... pretty sure this is how i got it wired though.
strange thing is, i accidentally connected the positive terminal of a 2nd power supply (That was not powered on, a second power supply had everything running) to the trigger input of the 555 (along with the...
i triggerd the 555 off of the incomming PWM signal and set it up as a 1500 us clock in monostable mode, the problem is, the incomming signal must go low again before the clock will go low. so basically the PWM signal rises before the clock, and falls after the clock reguarless of the PWM...
or wait i guess i would just set the 555 to be a 50 hz frequency signal with a pulse width of like 1501 us, have that be the clock for the D flipflop and then have it be falling edge triggered. Then send the PWM signal I am getting as the input to the flip flop..
thanks for the replies, I may go with the LM555 route since I am familiar with using them... would i set up the D-Flip Flip as rising edge triggered then have the LM555 spit out anything beyond 1500 us on the rising edge of the flip flop? similar to the picture attached but on the rising edge...
i am trying to design a switch that will output an active high if the width of the received PWM signal is greater then 1500 uS. if it is shorter then this time then it should output an active low. The frequency of this signal is 50 Hz.
I designed a RC circuit with a cutoff frequency of 50...