Uneven Clicks using 555 IC

This circuit produces two clicks then a short space before two more clicks etc. Changing the voltage on pin, 5 via the diode, adjusts the timing of the chip.
This circuit uses the 1N4148 diode to regulate the voltage on pin 5 of 555 IC to produce uneven click sound  effect.

COMPONENTS USED :
1.one 555 IC
2.one 1N4148 Diode
3.one 47K resistance
4.two 10uF Electrolytic capacitance
5.one 8ohm speaker
6.one 6-12V power supply

STEPS :
1.Place 555 IC on breadboard.
2.Connect pin 2 to pin 6.
3.Connect pin 4 to pin 8.
4.Connect pin 1 to ground.
5.Connect pin 8 toVCC.
6.Connect pin 2 with positive side of a 10uF cap,connect negative side to ground.
7.Connect a 47K resistance between pin 2 and pin 3.
8.Connect the 1N4148 diode between pin 5 and pin3.
9.Connect long leg of  another 10uf with pin3 .
10.Connect shorter leg of cap above with one terminal of speaker,connect another terminal of speaker to ground.
11.Turn on power supply and Enjoy..!

(NOTE - i didnt have a 47K resistance so i used a combination of resistances to make up 47K resistance )

Read More

Rail Road crossing Flashing LED using 555 IC

This circuit flashes two red LEDs for a model railway crossing.The circuit uses a 555 IC to flash the LED's alternatively to give effect of a rail-roard crossing lights.

COMPONENTS USED :

1.555 IC
2.two LED's (any color but recommended Red)
3.Two 470 ohm/ 220 ohm resistances
4.one 47K resistance
5.one 10uF Electrolytic Capacitance
6.one 6-12V supply

STEPS :

1.Place 555 IC on BreadBoard.
2.connect pin 2 to pin 6.
3.connect pin 4 to pin 8.
4.connect a 47K resistance between pin 2 and pin 3.
5.connect a 10uF cap between pin 2 and ground.
6.connect pin 1 to ground.
7.connect pin 8 to VCC.
8.connect a 470/220 ohm resistance between pin 3 and shorter leg of a LED,connect the longer led of that LED to VCC.
9.connect another 470/220 ohm resistance between pin 3 and longer led of 2nd LED , connect the shorter leg of that LED to ground.
10.Switch on Power supply and Enjoy.!

(NOTE : In pics below i have placed a series of resistances to make up 47K resistance,also instead of only 2 LED's  i used 4 . Just place  LED in parallel with LED's in your circuit and you are done.You can also place them in series but it will dim their intensity)

Read More

Make piano using 555 IC

This circuit produces a tone according to the button being pressed. Only 1 button can be pressed at a time, that's why it is called a monophonic organ. You can change the 1k resistors to produce a more-accurate scale.Each button has a different tone , Moreover you can alter resistances to get soundsof your choice.

COMPONENTS USED :

1.555IC
2.Six1K resistances.
3.one 10K resistance
4.one 10uF Electrolytic capacitor
5.one 100nF Ceramic Capacitor
6.one 8ohm speaker
7.Six Push buttons(Tick-Tack buttons)
8.one 6-12V supply

The circuit below shows the arrangement neede for 555 piano:

STEPS :

1.Place 555 IC on BreadBoard
2.Connect pin 1 to ground.
3.Connect pin 8 and pin 4.
4.Connect pin 6 and pin 2.
5.Connect 100nF between pin 2 and ground.
6.Connect 10uF cap to pin 3 with Longer leg towards pin3.
7.Connect Shorter leg of the Cap above to one side of speaker, connect other side of speaker to ground.
8.Connect pin 8 to VCC.
9.Connect a 1k resistance between pin 7 and VCC.
10.Then connect a 10K variable resistor between pin 7 and one end of Push button, connect other end of push button to pin 6.
11.Then repeat connection of other buttons and 1K resistances as Shown in above Diagram.

(NOTE - In the circuit below i added  a LED between +ve and -ve terminal of battery to indicate if the piano is on or off , it is useful in case you want to make this ckt on a PCB , LED will help in indicating if piano is on and it can be switched off when not in use to save battery. A Switch can also be placed b/w the VCC and the ckt to switch piano on and off)

Read More

Machine Gun Sound Using 555 IC

This Circuit using 555 IC produces sound similar to a machine gun.It uses a combination of resistances and capacitances along with 555 IC which produces machine gun sound.

Components used:
1.one 555 IC
2.one BC557 Transistor
3.one 8ohm Speaker
4.two 10nF Ceramic Capacitors
5.one 100uF Electrolytic Capacitor
6.two 10uf Electrolytic Capacitor
7.one 100K resistor
8.one 33K resistor
9.one 6-12v power supply

Steps :
 1.Place 555 IC on BreadBoard.
 2.Connect pin 1 to ground.
 3.Connect pin 2 with pin 6.
 4.Connect pin 4 with pin 8.
5.Connect 10nF cap with one leg connected to pin 5 and other to ground.(ceramic cap do not have +ve and -ve side)
6.Connect a 10nf cap with one leg to pin 2 and other leg to ground.
7.Connect a 33k resistor with one leg at pin 2 and other at pin 3.
8.Place a BC557 on breadboard and connect emitter to VCC.
9.Connect a 100uF cap with longer leg to emitter and shorter one to collector.
10.Connect a 100K resistor between base of transistor and ground.
11.Again Connect a 10uF between Base of transistor and one terminal of speaker,with longer leg of cap towards Base.
12.Connect a 10uf cap between pin 3 of 555  and the same terminal of step 11. above.
13.Connect other terminal of speaker to VCC.
14.Connect pin 8 to VCC.
15.Power on the circuit and you are done.

( NOTE -- i didn't have a 33K resistor so i tried by putting 3x 10K resistors , 2x 1K resistors in series equaling to 32K, And i have also placed a push button between VCC and the circuit in order to get more machine gun like effect manually)

Read More

Ticking Bomb Sound Circuit using 555 IC

This circuit sound just like a ticking bomb.It utilizes the astable mode of 555 IC and produces ticks that are similar to a time bomb ticking.

Components Used:

1.one 555 IC
2.two 10uF Electrolytic Capacitor
3.one 47K ohm resistor
4.one 6-12 V power supply
5.one 8Ohm speaker

STEPS :
1.Place 555 IC on BreadBoard.
2.Connect pin 1 to ground(-ve terminal of battery)
3.Connect pin 2 with pin 6.
4.Connect pin 4 with pin 8.
5.Connect pin 8 with VCC (+ve terminal of battery)
6.Connect 47K resistor with one leg at pin 2 and another at pin 3.
7.Connect 10uF cap with longer leg(+ve ) to pin 2 and shorter leg(-ve ) to ground.
8.Now connect another 10uF cap with longer leg to pin 3 and shorter leg to a terminal of speaker,
and connect another terminal of speaker to ground. 
9.leave pin 5,7 as there is no use of them in this circuit.
10.Turn on Power to circuit and Enjoy the effect.

 

(NOTE - I didnt have 47K so i tested the circuit by putting series resistances equal to 40K)

Read More

555 Timer LED Flashing circuit

This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2.

Components Required :

1x - 555  Timer IC
1x - LED (Any color )
1x - 470K Resistor
2x - 1K Resistor
1x - 1uF Electrolytic Capacitor
1x - 9V Voltage Battery

STEPS : 

1. Place the IC on your breadBoard , remember to put it in correct way else IC will burn.

2. Now connect the pin 1 to ground.
3. Connect the pin 2 with 6 and pin 4 with 8
4. Connect 1uF cap between pin 2 and ground, place long leng of capacitor towards the pin 2 and short leg towards ground.
5. Connect a resistance of 470K from pin 2 to 7 and connect a 1K resistance from pin 7 to VCC.
6. Connect pin 8 to VCC.
7. Connect a resistance of 1K from pin 3 to the longer leg of LED , then connect the shorter leg of LED to Ground.
8. Do not connect anything to pin 5 and leave it as it is.
9. Now just connect the Battery and enjoy the show.

Read More