How to Add LED Indication in Electrical Appliances(Glue Gun)

Introduction: How to Add LED Indication in Electrical Appliances(Glue Gun)

Hello everyone This is my first Instructable so please forgive syntax or any other error,THANKS.

We all have many electrical appliances like Glue gun,soldering iron,Drill Machine etc, but most of the time it happens that we don't have any immediate and visual indication that our appliances is on or not yet.For Example if you have Soldering iron without indication you can only know its on/off status by checking time to time if ot is hot or not.Well this is REALLY Annoying.So this instructable is the solution of this problem.

Step 1: Inspiration:

I am writing this instructable only because of the inspiration by another instructable,please follow the link first.Here it is


So i assume that you have got some thing made like the one shown in fig.

Step 2: Open the Glue Gun

Here we are adding LED light in a Glue gun,but you can add it in any appliance by following these simple steps.

So next step is that open the Glue gun by removing its all screws.It should look like the one in the picture.

Step 3: Make a Hole for LED

In the upper body part,make a hole by using a drill or simply use a Screw Driver(in case you are a bit Lazy like me).(fig.1)

You can make hole in any part of the body where you think that the LED with diode and resistor will fit perfect.

Make it beautiful by removing/cutting extra plastic from sides of the hole.You can use a paper cutter like one i used(fig.2)

Step 4: Making Connections

solder some thin wires with the legs of LED to make them a bit longer so that we can easily connect it with incoming AC wires.

1)Make sure to unplug the Gun(of course you wil) :D

2)If you can see a joint in the inside wires of gun,remove insulation around the joint about half inch .if you dont have joint make one yourself.

3)Connect the wires from LED to the joint(dont care about +ve and GND because its AC) , and solder the joint strongly.

4)Now cover both joints separately with Insulation tape.

5)Place the LED in its place and close the body of the gun,make sure our LED is out through the hole.

6)Place the Screws back.

Step 5: Final Touches

When the LED is out through the hole, apply some bond to keep it in its place.

So it may look like the one shown in fig.

Thanks for viewing this instructable.Suggestions are always accepted.

Step 6: Improvements Possible

I have seen that the 22Kohm(2 watt) is heating too much and i am unable to find the solution of this problem.

If you have fixed it please let others know.


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    4 years ago

    use a capacitor to limit current instead of resistance. Caps ( ideal ) do not dissapate power.


    Reply 4 years ago

    What kind of capacitor should we use?
    And where do we connect it?


    Reply 4 years ago

    You want one rated for at least 200v, and non-polarized. You need to compute its impedance for the desired current through the led. I think ignoring phase will be ok as I think the impedance of the led is low. Beware that many would consider this to be a dangerous circuit as it has direct connection to the mains without a transformer. The forum on might be willing to discuss the theory.

    DIY Hacks and How Tos

    This is a great trick I have done this to several of my less frequently used tools.


    Reply 4 years ago

    yes it is