How to make 220v universal led tester

In this project we learn how to make 220v universal led tester easy at home. its very easy and simple project. you can test all type of leds. for making this project we need some components.

Components:

1. Bridge rectifier
2. 3 volt LED
3. 68k resistor
4. 24v zener diode
5. 100k, 1 watt resistor
6.  Shoe switch
7.  Old tester wire

Now follwing few steps and make same.

• Connect 1 side of 68k resistor with 3v LED 
• 2nd side of 68k resistoe and LED use for 220v input.
• Now 100k 1w resistor connect with 2nd side of 68k resistor.
• And now connect bridge rectifire. (you can make bridge rectifier using 4 diodes of 1N4007.
• Finaly connect 24v zener diode. 

we learn it more batter with watching video

Video of homemade 220v universal led tester

Total Cost of 220v universal led tester:

the total cost of this project round about 0.3$

• shou switch cost roundabout 0.2$ 
• zener diode cost roundabout 0.01$
• bridge rectifire cost roundabout 0.04$
• led cost roundabout 0.01$
• 68k resistor cost roundabout 0.01$
• 100k 1w resistor cost roundabout 0.03$