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555 Timer circuit, usage and applications

555 Timer circuit details and applications:

We widely used 555 timer IC in electronic projects. This chip has multi-function time-based output signals. We can use 555 IC chips with the Arduino or make separate projects. It is available with different brand names, i.e., LM555, NE555, and SE555. But it is originally manufactured by Texas Instruments.

The chip is manufactured in different packages, e.g. SOIC, PDIP, VSSOP. For more details, the 555 timer ic datasheet is available at the Texas official site.

555 Timer
We use it for time-based operated siren circuits and also led flasher circuits to operate. It can produce a lot of functions, e.g., oscillation, Astable, Monostable, flip-flop logic, and pulse width modulation.

How does a Timer IC work?

You can get a lot of solutions from the chip if you want to understand how it works. There are a lot of timer applications, e.g., timer-controlled circuits, sound, LED flashers, and more.

555 Timer Pinout

The circuit diagram clearly explains the 555 pinout. In the picture, I show the pin functions of the chip.

555 Timer

The 555 timer circuit diagram clearly explains the pins. In the picture, I show the pin functions
of the chip

Ground (Pin-1)

We require a negative supply voltage to pin #1 to operate the 555 IC chip.

Trigger (Pin-2)

One external capacitor and resistor control the trigger pin output. It will generate the oscillation signal as a flip-flop, depending upon the external pulse. Its value varies by changing the value of capacitor and resistor.

It triggers when pin # 2 receives a signal decrease to ⅓ of the supply voltage. Depending on the required output, it can operate either Astable or Monostable.

Output (Pin-3)

The output pin functions as mentioned by its name. It will generate output value either to run the motor, flash led, or some speaker.

Reset (Pin-4)

The reset pin is will activate if a negative pulse applies to Pin # 4. By overriding all other inputs, this pin will start a new timing cycle.

Control voltage (Pin-5)

This pin is used to control threshold and trigger pins. The pulse width of a waveform can be generated and controlled through Pin 5. In order to activate this, the external voltage must be applied.

Threshold (Pin-6)

The threshold pin function is to monitor the control voltage. It is an open collector output. When the control voltage ⅔ of VCC is reached, the timing cycle stops, and output 3 (pin # 3) becomes low.

Discharge (Pin-7)

Pin 6 discharges the capacitor, which is connected in phase to the output pin. It is inside the 555 IC, NPN collector output; it activates when the voltage becomes equal to ⅔ of the supply voltage.

VCC (Power supply) Pin-8

To operate the 555 circuit, 5 V to 16 VDC supply is required at the VCC pin. The device can sink or source up to 200mA current.

555 timer datasheet pdf

You can download the ne555 timer datasheet for reference. It can help you a lot for better understanding.

555 timer circuit diagram

In the figure, you can see a circuit diagram. The device has a total of eight pins. We connect negative voltage or ground to pin #1 VCC to pin #8. Its operating temperature range is 70 Celsius.

555 Timer

Comments

Matthew Carter said…
You are giving such interesting information. It is great and beneficial info for us, I really enjoyed reading it. Thankful to you for sharing an article like this. Astronomical Timer Street Lights in India

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