This Simple LED Heart Blinker Circuit with IC 555 Timer is very easy project.
It uses one timer IC and one transistor.
LEDs are fixed in heart shape so it looks nice.
When we give 9V battery power then LEDs start blinking in heart pattern.
This project is easy for beginners.
It is also good for decoration and small gift idea.
Circuit Working:
Parts List:
| Component | Value | Quantity |
|---|---|---|
| Resistors | 2.2k 1/4 watt | 1 |
| 330Ω 1 watt | 1 | |
| Capacitors | Electrolytic 100µF 25V | 1 |
| Semiconductors | IC 555 | 1 |
| Transistor BC547 | 1 | |
| Red LEDs 5mm 20mA | 8 to 10 | |
| 9V Battery | 1 |
In this circuit 555 timer IC works in astable mode.
It gives square wave pulses at pin 3 output.
These pulses go to transistor Q1 BC547.
Transistor acts like switch and controls LED heart.
When pin 3 gives high signal then base gets current.
Then transistor allows current through LEDs and they glow.
When pin 3 goes low then transistor stops current and LEDs turn off.
This process repeats again and again.
So LEDs blink continuously.
Formulas:
Blink speed depends on capacitor C1 and resistor with timer IC.
Formula for astable:
f = 1.44 / ((R1 + 2×R2) × C1)
here,
- C1 is 100µF
- R1 is 2.2k
These decide blink speed.
So,
f = 1.44 / (R1 × C1)
= 1.44 / (2200 × 100×10^-6)
= 6.5 Hz
That means LEDs blink 6 to 7 times in one second.
If we change capacitor then blink speed will also change.
For slow blink we can use big capacitor like 470µF.
How to Build:
To build a Simple LED Heart Blinker Circuit with IC 555 Timer following steps are required to be followed:
- First collect all parts same like in circuit diagram.
IC 555 connections:
- Pin 1 connect to negative of battery
- Pin 2 connect with capacitor C1 and pin 6
- Pin 3 connect to resistor R1 then to transistor base
- Pin 4 connect to positive of 9V battery
- Pin 6 connect with capacitor and pin 2
- Pin 8 connect to +9V battery
Transistor BC547 connections:
- Collector connect to +9V battery
- Emitter connect to LED array through resistor R2
- Base connect to resistor R1 and pin 3 of IC555
Conclusion:
Simple LED Heart Blinker Circuit with IC 555 Timer is easy and interesting project.
It uses only one 555 timer IC, one transistor, some resistors, capacitor and LEDs arranged in heart.
By changing capacitor value, blinking speed can be controlled.
This is a nice beginner electronic project and also useful for decoration or as a small gift item.