Hey there! I'm a supplier of flashers, and today I wanna chat about how a flasher controls the blinking rate. It's a pretty interesting topic, and it's something that a lot of people don't really think about, but it's super important for things like turn signals on motorcycles and cars.
First off, let's talk about what a flasher actually is. A flasher is a device that controls the blinking of lights, like turn signals or hazard lights. It's basically a switch that turns the lights on and off at a specific rate. There are different types of flashers out there, but the most common ones are thermal flashers and electronic flashers.
Thermal Flashers
Let's start with thermal flashers. These are the older type of flashers, and they work based on the principle of thermal expansion. Inside a thermal flasher, there's a bimetallic strip. This strip is made up of two different metals that expand at different rates when heated.
When you turn on the turn signal or hazard light, current flows through the bimetallic strip. As the current passes through, the strip heats up. Because the two metals expand at different rates, the strip bends. This bending action breaks the electrical circuit, which turns off the lights.
Once the lights are off, the bimetallic strip starts to cool down. As it cools, it straightens out again, closing the electrical circuit and turning the lights back on. This cycle repeats over and over again, creating the blinking effect.
The blinking rate of a thermal flasher is determined by the characteristics of the bimetallic strip. Things like the thickness of the metals, the length of the strip, and the amount of current flowing through it all play a role in how quickly the strip heats up and cools down. For example, if the bimetallic strip is thicker, it will take longer to heat up and cool down, resulting in a slower blinking rate.
Electronic Flashers
Now, let's move on to electronic flashers. These are the more modern type of flashers, and they're becoming more and more popular because they're more reliable and offer more control over the blinking rate.
Electronic flashers use electronic components like transistors, resistors, and capacitors to control the blinking rate. Instead of relying on thermal expansion, they use a timer circuit. This timer circuit generates a series of electrical pulses at a specific frequency.


When you turn on the turn signal or hazard light, the electronic flasher receives a signal. The timer circuit then starts generating pulses. These pulses are used to control the flow of current to the lights. When a pulse is high, current flows to the lights, turning them on. When the pulse is low, the current is cut off, turning the lights off.
The blinking rate of an electronic flasher can be easily adjusted by changing the values of the components in the timer circuit. For example, if you increase the value of a capacitor, the time it takes for the capacitor to charge and discharge will increase, resulting in a slower blinking rate.
Factors Affecting the Blinking Rate
There are a few factors that can affect the blinking rate of both thermal and electronic flashers. One of the main factors is the load on the flasher. The load refers to the number and type of lights that are connected to the flasher.
If you have more lights connected to the flasher, it will draw more current. In the case of a thermal flasher, this increased current will cause the bimetallic strip to heat up faster, which can speed up the blinking rate. In an electronic flasher, the increased load can also affect the performance of the timer circuit, potentially changing the blinking rate.
Another factor is the voltage. The voltage supplied to the flasher can also have an impact on the blinking rate. If the voltage is too high, it can cause the lights to blink faster. If the voltage is too low, the lights may blink slower or not at all.
Our Products
As a flasher supplier, we offer a range of high - quality flashers. For example, we have the Universal 12V Turn Signal Relay. This is a great option for those looking for a reliable and universal flasher that can be used in a variety of applications. It's designed to work with 12V systems and provides a consistent blinking rate.
We also have the Motorcycle Silent Hazard Blinker. This flasher is specifically designed for motorcycles and is silent in operation. It offers a smooth and reliable blinking function for your hazard lights.
And then there's the Motorcycle Silent Turn Signal Relay. This one is perfect for motorcycle turn signals. It ensures that your turn signals blink at the right rate and does so quietly, so you won't be distracted by any unnecessary noise.
Contact Us for Purchasing
If you're in the market for a flasher, whether it's for a motorcycle, a car, or any other application, we'd love to hear from you. We can provide you with detailed information about our products, help you choose the right flasher for your needs, and discuss pricing and delivery options. So, don't hesitate to reach out and start a conversation about your flasher requirements.
References
- Automotive Electrical Systems Handbook
- Electronic Circuits: Analysis and Design by Thomas L. Floyd
So, that's a bit about how a flasher controls the blinking rate. I hope this has been helpful and given you a better understanding of these important devices. If you have any questions, feel free to drop them in the comments or get in touch!




