# Negative going edge trigger circuit

#### George Osama

Joined Mar 17, 2018
8
Can anyone help me with this assignment and explain it to me how is the circuit going to work? the assignment is attached.

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#### ericgibbs

Joined Jan 29, 2010
9,574
hi George,
Welcome to AAC.
E

#### George Osama

Joined Mar 17, 2018
8
hi George,
Welcome to AAC.
E
the assignment was marked today 24/4/2018 and my attempt is wrong, the idea is that my personal tutor couldn't explain it to us that's why I want to know how it works.

#### ericgibbs

Joined Jan 29, 2010
9,574
hi,
What value for the resistor between A and C did you choose.?
E

#### George Osama

Joined Mar 17, 2018
8
hi,
What value for the resistor between A and C did you choose.?
E
Hi,

I picked 1k ohms but my question is if we need the resistor for the capacitor to discharge how it is gonna discharge with the potential across the capacitor equal to Vcc so there is no potential difference between B and C how it is gonna discharge?

#### ericgibbs

Joined Jan 29, 2010
9,574
ho,
Consider that if point B is at Vcc and also point A is also at Vcc due to the 1k resistor from A to C, what will the voltage across the capacitor be if I now connect point A to 0V.

E

#### ericgibbs

Joined Jan 29, 2010
9,574
hi,
Consider that if point B is at Vcc and also point A is also at Vcc due to the 1k resistor from A to C, what will the voltage across the capacitor be if I now connect point A to 0V.

E

#### George Osama

Joined Mar 17, 2018
8
hi,
Consider that if point B is at Vcc and also point A is also at Vcc due to the 1k resistor from A to C, what will the voltage across the capacitor be if I now connect point A to 0V.

E
Hi,
Okay, I get what you mean but can you tell me the path of the current and the potential difference causing it before pressing the switch and after pressing it and please tell me the state of the switch when you are answering.

#### Jony130

Joined Feb 17, 2009
5,145