Simple 24V Lamp Flasher Circuit using Transistors

A simple circuit made for a 24V lamp flasher uses transistors to make lamps blink back and forth in a never ending loop.

This circuit is made to control two lamps so they turn on and off one after the other similar to how a transistor based astable multivibrator works.

You can use this kind of circuit for different signaling purposes, like warning lights or decorative lights where you want a steady blinking effect.

It is important to connect this circuit to a 24V DC power source.

Circuit Working:

Parts List:

The circuit mentioned here is called an astable multivibrator and it works using transistors to create a continuous back and forth action.

This makes lamps L1 and L2 light up one after the other in a cool pattern.

First, when the transistor Q1 turns on it lets electricity flow to lamp L2 making it light up while lamp L1 stays off.

At the same time the capacitor C1 starts charging through the resistor R1.

After a certain amount of time the voltage in C1 gets high enough.

Once the voltage hits that point it turns on transistor Q2 which then switches off Q1.

This means lamp L1 lights up while lamp L2 goes out.

This whole process repeats with capacitor C2 and resistor R2.

This creates a never ending cycle of the two lamps turning on and off.

The speed at which the lamps flash depends on the values of C1, C2, R1 and R2 since these parts control how long it takes for the capacitors to charge and discharge.

Formulas with Calculations:

Below mentioned are the formulas with calculations which helps you to understand better for designing you own Simple 24V Lamp Flasher Circuit using Transistors:

The time period T of each ON OFF cycle is determined by the RC time constant:

T = 1.38 × R × C

where,

• R is the resistor value 68k
• C is the capacitor value 10µF

Substituting values:

T = 1.38 × 68,000 × 10 × 10 − 6

T = 0.9384 = 1 second

Thus, the lamps flash alternately every 1 second.

How to Build:

To build a Simple 24V Lamp Flasher Circuit using Transistors following steps are required to be followed:

• Assemble all the components mentioned in the above circuit diagram
• Connect collector of transistors Q1 and Q2 to one end of lamps L1 and L2 and other end of lamps L1 and L2 connect to positive supply terminal of 24V
• Connect base of transistors Q1 and Q2 to one end of resistors R1 and R2 and other end of resistors connect to positive supply terminal
• Connect emitter of transistors Q1 and Q2 to GND of the circuit.
• Connect capacitors C1 and C2 between resistors R1 and R2 and Lamp L1 and L2.

Conclusion:

This Simple 24V Lamp Flasher Circuit using Transistors is an easy and effective way to create a flashing light effect.

It is great for things like warning lights, emergency signals and even for fun decorative lights.

You can change the resistor and capacitor values to make the lights flash faster or slower, depending on what you need.

The 2N3055 power transistors are really strong, so they can handle a lot of current which is perfect for powering bright lamps.

References:

Datasheet Transistor 2N3055