From the internal circuit diagram of the NE555 you can see that the DISCHARGE output, Pin 7, is connected to the collector of a transistor. The base of the transistor is connected to the output of the RS latch.
![]() Internal circuit diagram DISCHARGE output NE555. |
The transistor is always switched through when the OUT output is LOW.
![]() Circuit diagram measurement of resistance DISCHARGE output of the NE555. |
That you can now easily measure with an ohmmeter...
![]() Circuit resistance measurement of DISCHARGE output of NE555. (Enlarge) |
But what do you use the DISCHARGE output for. In the next experiment, it becomes clear to you...