Introduction: Adding Led Indicator to Old Soldering Iron
i had old soldering iron laying around
i plugged but there was no indication on ON
so i soldered a led in it
Step 1: Material
A Resistor of value 470k ohm
A normal led (any colur)
Another soldering iron to solder
A drill or something to make a hole in handle of your iron
Step 2: Connection
Connect resistor to cathode of led and other end of resistor to the terminal of diode (diode is used already in Generic soldering iron as half wave rectifier)
now the other leg of led to 2nd wire of AC input .
Step 3: Circuit Diagram
its the circuit diagram. for easy to understand
Step 4: Housing
Make a hole in handle to place led
so we can see it
Step 5: Pack It Back
its done .
a simple yet important thing
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