I have a problem with the 555 delay before turned-off. The problem is that I want the time cycle to start after the switch is released if it was held for a period of time.
I found this circuit at "learningaboutelectronics" and I got 11 seconds delay with 100UF capacitor and 100KΩ resistor, but the problem is if I held the push button "Momentary switch" for more than 11 seconds there will be no delay before turned-off because the time cycle begins immediately when I push the switch.
My question: Is there a way to make the time cycle starts after I release the switch when it was held for a period of time?
Because I'm planning to make a homemade intercom, the delay will be useful when I hold the switch to talk on the intercom" For a period of time the switch will be held to activate the audio amplifier chip" and then when I release the switch the camera and the monitor both will be working for 11 seconds to be sure that the person who I was talking to is left or still there.