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Flashing Red, Green Railway Signal Lamp Circuit

Last Updated on June 25, 2020 by Swagatam 18 Comments

In this post I have explained how to make a simple railway signal lamp which can be used by the guards for providing a handheld signalling to the various trains with the many specified signalling modes. The idea was requested by Mr. Bala.

Table of Contents
  • Technical Specifications
  • The Design
  • Circuit Diagram
  • Circuit Operation

Technical Specifications

I need a project design for railway led signalling light . The light must have 4 modes. 1) red stable 2) green stable 3) red flashes 4) green flashes also suggest suitable charges for the circuit.

The Design

The proposed railway signal lamp circuit using flashing LEDs can be implemented through a simple IC 555 astable circuit as shown below:

Circuit Diagram

Flashing Red, Green Railway Signal Lamp Circuit

Referring to the above diagram, the circuit may be understood as I have explained below:

Circuit Operation

The IC 555 is configured in its standard astable mode which is supposed to generate alternate ON/OFF potential at its pin#3.

The IC is capable and is rated to deliver up to around 200mA current, therefore 1 watt LEDs become suitable for working directly with this pinout of the IC.

Since the 1 watt LEDs are rated to handle 350mA, the available lower amount of current allows the LEDs to work without heatsinks, yet so, with 100mA current the light from these LEDs can be expected to be significantly bright and quite applicable for the requested railway safety signal lamp application.

The 1M pot is used to adjust the flashing rate on the LEDs, while the switches determine the LED operational modes as per the requested specs.

The switches must be SPDT type with CENTER OFF facility.

Toggling the relevant switches downwards produces a constant switched ON response on the LEDs, while toggling them on the lower side allows the LEDs to flash.

The center OFF feature of the switch can be used for keeping the LEDs shut off.

The LEDs must be housed inside high gloss reflector cones for getting an enhanced light output and an increased visibility range.

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Filed Under: Sensors and Detectors Tagged With: Flashing, Green, Lamp, Railway, Signal

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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Reader Interactions

Comments

  1. M Verma says

    July 19, 2020 at 11:00 pm

    Dear sir I want to make flashing light of railway so give me a real circuit diagram of flashing signal torch

    Reply
    • Swagatam says

      July 20, 2020 at 1:46 pm

      Dear M Verma, please tell me the power of the LEDs you want to use.

      Reply
  2. Mike Goobic says

    June 24, 2020 at 7:45 pm

    Hello,
    I’d like to re-purpose this circuit for use in a model, and was wondering if there’s enough voltage to drive 2x green LED and 2x red LED.
    Regards,
    Mike

    Reply
    • Swagatam says

      June 25, 2020 at 9:34 am

      Hi, for 2 LEDs you will need a minimum of 6V supply. Alternatively you can use any supply up to 15 V and dimension the LED resistors using the following formula:

      R = Supply – (3.3 + 3.3) / LED current

      Reply
      • Mike Goobic says

        June 25, 2020 at 7:30 pm

        Much appreciated – I’ll have a go at this!

        Reply
        • Swagatam says

          June 25, 2020 at 8:24 pm

          My pleasure!

          Reply
  3. Sandip Choudhury says

    October 30, 2019 at 5:22 pm

    Sir please give the 5 volt usb charger circuit diagram for this ckt. To make it rechargeable circuit

    Reply
    • Swagatam says

      October 30, 2019 at 8:41 pm

      Sandip, you can try this:

      https://www.homemade-circuits.com/usb-automatic-li-ion-battery-charger/

      Reply
  4. murali says

    November 26, 2015 at 6:11 pm

    thank you sir , i will try and tell you back .if you have time kindly draw the circuit.

    bala

    Reply
    • Swagatam says

      November 28, 2015 at 2:05 am

      Please try it, if you find it too difficult, then I may possibly update the drawing in the above article….

      Reply
    • murali says

      November 28, 2015 at 6:01 pm

      sure sir .

      Reply
  5. murali says

    November 25, 2015 at 6:17 pm

    dear sir , i did the circuit. it is working wonderful. i have a small request to you that the LED brightness is not enough for my application. kindly do the need full.

    Thank you

    Bala

    Reply
    • Swagatam says

      November 26, 2015 at 2:29 am

      dear bala,

      take a TIP127 transistor connect its base through a 1K resistor with pin3 of the IC directly, remove the 1N4007 diode, and the blue wire.

      connect its emitter to the positive line.

      connect the blue which was removed earlier with collector of the transistor.

      now change the resistor f the LEDs to 20 ohm or 10 ohm 2 watt each…making sure the LEDs are mounted on large heatsinks

      Reply
  6. murali says

    November 13, 2015 at 3:32 am

    thank you so much sir, i will do this circuit . after that i will give you feedback .

    bala

    Reply
    • Swagatam says

      November 13, 2015 at 5:32 am

      you are welcome bala…

      Reply
  7. murali says

    November 12, 2015 at 4:43 pm

    brilliant circuit. thank you so much . i will do it in practical and give you feed back .

    bala

    Reply
    • Giri says

      August 9, 2020 at 6:29 am

      Sir,
      LED is constantly glowing on one side of switch but not blinking on the other side of the switch. Please suggest.
      Thankyou

      Reply
      • Swagatam says

        August 9, 2020 at 9:34 am

        Giri, Connect a 3rd LED from the 1N4007 cathode to ground through 1k resistor. check whether this LED is flashing or not. If not then your IC 555 circuit is faulty. If yes, then your switch wiring may be incorrect. Please check these issues.

        Reply

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