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Make a Fading Led using 555 Timer IC - KT971

Make a Fading Led using 555 Timer IC - KT971

SKU:KT971

1000 in stock

Regular price Rs. 210.00
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KIT INCLUDES:


HARDWARE REQUIRED

PIN DESCRIPTION

LED

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.



BC547 TRANSISTOR




CIRCUIT DESCRIPTION

  • Pin 1 of 555 TIMER IC to the NEGATIVE rail of a breadboard.
  • Pin 2 of 555 TIMER IC to pin 6 of 555 TIMER IC
  • Pin 4 of 555 TIMER IC to pin 8 of 555 TIMER IC
  • Pin 8 of 555 TIMER IC to positive rail on the breadboard
  • Pin 6 of 555 TIMER IC to transistor base terminal
  • Connect 33k ohm resistor to both the Pin 3 and 6 of 555 Timer IC.
  • Connect Pin 2 of 555 Timer IC to the positive terminal of 47 uf capacitor and the negative pin of the capacitor to GND rail on the breadboard.
  • Connect Emitter pin of the transistor to the positive terminal of led via a 470-ohm resistor and the GND of led is being connected to the GND rail on the breadboard.
  • Connect pin 6 of the 555 Timer IC to the base terminal of the transistor.
  • Connect collector pin of the transistor to the 8th pin of 555 Timer IC

OUTPUT

After making the circuit connect the battery you will see the Change in the value of capacitor the fading time will change