• Make a Firefly using 555 Timer IC - KT958 - REES52
  • Make a Firefly using 555 Timer IC - KT958 - REES52
  • Make a Firefly using 555 Timer IC - KT958 - REES52
  • Make a Firefly using 555 Timer IC - KT958 - REES52
  • Make a Firefly using 555 Timer IC - KT958 - REES52
  • Make a Firefly using 555 Timer IC - KT958 - REES52
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Make a Firefly using 555 Timer IC - KT958

Make a Firefly using 555 Timer IC - KT958

KT958

1000 in stock

Rs. 432.00
Rs. 432.00
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KIT INCLUDES:


HARDWARE REQUIRED

SPECIFICATION

Power supply – 9V( from 9v battery)

PIN DESCRIPTION

CAPACITOR

The Shorter Terminal is negative and the longer Terminal is Positive.

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.

CIRCUIT DESCRIPTION

  1. pin 1 of 555Timer IC connect with negative rail
  2. Connect pin 2 and 6 of 555Timer IC
  3. pin 2 of 555Timer IC connect with Positive pin of 47uf cap and the negative pin connected to the negative rail
  4. pin 3 of 555Timer IC connected with led positive through 470ohm resistor and negative pin to negative rail
  5. pin 8 of 555Timer IC connected to pin 7 with the 1M resistor and pin 7 to pin 6 with the 22k resistor
  6. pin 8 of 555Timer IC connected to the positive rail

WORKING

The blinking frequency can be varied, by changing the 10uF capacitor value from 4.7uF to 100uF.