Make your own ticking bomb using 555 Timer IC.
KIT INCLUDES:
- 555 timer IC - 1
- 10uf capacitors - 3
- 47K resistor - 2
- 8 ohm speaker - 1
- Breadboard 840 points - 1
- Single stand wire 2m – 1
HARDWARE REQUIRED
- 555 timer IC - 1
- 10uf capacitors - 3
- 47K resistor - 2
- 8 ohm speaker - 1
- Breadboard 840 points - 1
- Single stand wire 2m – 1
PIN DESCRIPTION
555 TIMER IC
Pin |
Name |
Purpose |
1 |
GND |
Ground reference voltage, low level (0 V) |
2 |
TRIG |
The OUT pin goes high and a timing interval starts when this input falls below 1/2 of CTRL voltage (which is typically 1/3 Vcc, CTRL being 2/3 Vcc by default if CTRL is left open). In other words, OUT is high as long as the trigger low. Output of the timer totally depends upon the amplitude of the external trigger voltage applied to this pin. |
3 |
OUT |
This output is driven to approximately 1.7 V below +Vcc, or to GND. |
4 |
RESET |
A timing interval may be reset by driving this input to GND, but the timing does not begin again until RESET rises above approximately 0.7 volts. Overrides TRIG which overrides threshold. |
5 |
CTRL |
Provides “control” access to the internal voltage divider (by default, 2/3 Vcc). |
6 |
THR |
The timing (OUT high) interval ends when the voltage at threshold is greater than that at CTRL (2/3 Vcc if CTRL is open). |
7 |
DIS |
Open collector output which may discharge a capacitor between intervals. In phase with output. |
8 |
Vcc |
Positive supply voltage, which is usually between 3 and 15 V depending on the variation. |
CIRCUIT REQUIRED
- pin 1 of 555 Timer IC to negative rail on the breadboard
- pin 2 of 555 Timer IC to of 555 Timer IC pin 6 and pin 4 of 555 Timer IC to of 555 Timer IC pin 8
- pin 8 of 555 Timer IC to positive rail on the breadboard
- 47 k resistor to pin 2 and 3 of 555 Timer IC
- negative of capacitor 1 connects to negative rail positive to pin 2 of 555 Timer IC
- positive of capacitor 2 to pin 3 of 555 Timer IC and negative to positive of the speaker and negative of the speaker to ground
WORKING
Once you connect the battery then the circuit will complete and the speaker starts make the sound.