Transistor Based LED Strobe Light Circuit

In todays world light effects are very interesting and these light effects are used in toys, decoration and are also used in warning systems.

A Transistor Based LED Strobe Light Circuit is a blinking light that turns ON and OFF very fast.

Therefore, it looks very attractive and is very useful.

This circuit is very simple with few components, easy to build for beginners and is with very low cost.

Circuit Working:

The circuit uses one NPN BC547 transistor and it works as a switch.

Resistors control the current, capacitor creates a delay and battery provides power.

When power is ON the capacitor C1 starts charging.

So base of transistor gets voltage slowly.

Then transistor turns ON, and so white LED2 glows.

At the same time capacitor discharges and therefore, base voltage drops.

Then transistor turns OFF and so white LED2 turns OFF.

Now capacitor again starts charging and this cycle repeats.

Hence, strobe effect is created and orange LED1 glows softly for visual effect.

Below is the timing formula:

T = R x C

where,

T = 10000 x 0.000001

T = 0.01 seconds

So blinking speed of LED is fast.

To build a Transistor Based LED Strobe Light Circuit follow the below steps for connection:

First, start to collect all the parts as shown in circuit diagram.
Then Q1 BC547 Transistor emitter pin is connected directly to ground line.
Base pin is connected to resistor R3 and capacitor C1 negative side.
Capacitor positive side is connected between resistor R1 and anode of LED1 and cathode of LED1 connects to GND.
Collector pin is connected white LED2 cathode side and anode of LED2 is connected to resistor R2.
At last battery positive connects to positive supply of the circuit and battery negative goes to ground line.

This Transistor Based LED Strobe Light Circuit is very useful.

It is simple and reliable so beginners can try it easily.

It uses few components and is with low cost.

Finally, this circuit is good for practice which helps to understand transistor working.