The Function of The Pin
Pin 1 (Ground/GND)
Connected to Ground/0V.
Pin 2 (Trigger)
PIN 2 has control over pin 6. If PIN 2 is low, and PIN 6 is low, the output runs and remains high. If the PIN 6 is high, and pin 2 goes low, the output goes low while the PIN is 2 low. This PIN has a very high impedance (about 10M) and will trigger around 1uA.
Pin 3 (Output)
This pin has two conditions that are “high” and “Low/Low”.
Pin 4 (Reset)
When pin 4 is connected to the ground, it will be “low”. The IC Output will cause this device to become OFF. Therefore, to ensure IC is in the condition ON, pin 4 is usually given a signal “High”
Pin 5 (Control)
To provide access to the internal voltage divider. By default, the specified voltage is 2/3 VCC.
PIN 6 (Threshold)
Issued to make the Output “Low”. The “Low” condition in this Output will occur when the pin 6 (Threshold) is changed from Low
Pin 7 (Discharge):
At the time of the “Low” Output, pin 7 impedance is “Low”. While the “High” Output, the pin 7 impedance is “High”. This Discharge pin is usually associated with a capacitor that serves as the timing interval determinant. The capacitor will charge and dispose of the payload in line with it.
Pin 8 (VCC)
Connects to a positive power supply (VS). Positive Terminal voltage source DC (approx. 4, 5v or 16v).
How is it Works?
First, it will go through pin 8 and pin 4 to activate NE555 and the current will go through resistors and capacitors. After that pin 6 and 2 are connected on the same track. Pin 3 serves as the output connected directly to the capacitor which will be direct to the speaker as output. While the pin 7 is directly parallel connected to 2 resistors. Pin 1 is directly connected to the ground and pin 5 is not connected because the control occurs on the push button.
