confounded
New Member
Hi, im reading about the 555 chip.
I have a monostable circuit and my book says in order to become an edge triggered device you add R1, C1 and D1 as i have in my rough sketch.
I just dont understand why you need the diode D1?
I see the capacitor C1 will make pin 2 low if input goes low, then C1 will recharge to take pin 2 high once more. The capacitor C1 is charged through R1 if input is still low.
Why do you need the diode?
I have a monostable circuit and my book says in order to become an edge triggered device you add R1, C1 and D1 as i have in my rough sketch.
I just dont understand why you need the diode D1?
I see the capacitor C1 will make pin 2 low if input goes low, then C1 will recharge to take pin 2 high once more. The capacitor C1 is charged through R1 if input is still low.
Why do you need the diode?