Consider to the circuit shown. You replace the key switch, that controls the THRESHOLD input, by the capacitor C1. Simultaneously, the capacitor is also connected to the DISCHARGE output.
![]() Circuit diagram connecting the output of a DISCHARGE NE555 with a capacitor. |
Once you push the pushbutton switch S1, the LED2 lights up. After approximately one second the NE555 switches back independently. The LED1 lights up again. How does this happen?
![]() Circuit for connecting the DISCHARGE output of the NE555 with a capacitor. (Enlarge) |
As soon as you push the pushbutton switch S1...
This is the basic circuit of a monostable multivibrator or monoflop using a NE555. More on that later...
But there is another way to use the DISCHARGE output.