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Car Blown Tail Lamp Indicator Circuit

Last Updated on September 24, 2021 by Admin 2 Comments

The article explains a circuit which can be installed in cars to know whether the tail lamps are OK or whether they are blown.

By producing the presented circuit between the lamp as well as the supply, the expected blown brake light bulb indicator could be conveniently constructed and executed in every vehicle.

Car brake light lamp fused blown indicator circuit

How the Circuit Works

The performance is reasonably easy:

The IC 555 is configured as a simple voltage comparator, where its pin2 results in being the sensing input.

The BC557 alongside the linked R1, R2 resistors forms a current to voltage converter stage.

Assuming that a working bulb lamp continues associated across the proven points, a small negative potential corresponding to the bulb current consumption is designed across Rx.

This potential evolves into satisfactory to continue the BC557 turned on and performing which sustains pin2 of the IC high.

With the above situations, pin3 of the IC stays low and the LED continues to be switched off.

In spite of this in an event the car bulb fuses or quits illuminating, the potential across Rx fades away or eliminates to n range where the BC557 merely quits executing.

This quickly offers pin2 of the IC high as well as the LED commences glowing suggesting the blown brake light bulb situation to the user.

The above design could be moreover efficiently employed in numerous purposes which desire some form of current (amp) supervising for instance an over-current or over-load cut off etc.

R1 could be measured provided below:

R1 = 0.7/bulb current rating

The above discussed circuit could be significantly made easy by way of the following cofiguration:

Car brake light lamp blown fused indicator circuit using transistors

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About Admin

Hey friends, Thanks a bunch for stopping by this site! I am an engineer with a Bachelor of Engineering in Electronics and Telecommunication. One of my passions is gathering information from all sorts of electronics books and tutorials. I then take that information and compile it into a language that is super easy to understand. My goal is to make those complex electronics circuit concepts and technical terms much more accessible for all the new and budding electronics engineers out there. I can also design customized circuit diagrams as required by the users.
If you have any questions related to this field, please do not hesitate to drop a comment! I am always here and ready to help you out with any queries you might have. I cannot wait to hear from you!

Reader Interactions

Comments

  1. Augustine Sii Yu Kiong says

    September 16, 2018 at 3:39 pm

    Hi,i am interested with this circuit.Have you tested with this circuit?Is it work?
    Hope to receive your reply soonest.Thanks

    Reply
    • admin says

      September 18, 2018 at 10:53 am

      Hi, sorry I have not yet tested it, but I may test it soon and present the results here

      Reply

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