This Instructables will show you how to build a lamp tester. The red led will light up if the lamp you are testing it on is not broken. I didn't invent this.
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Step 1: Parts
To this project you will need
2) BC 547 resistors
one 33k ohms resistor
one 560k ohms resistor
one 4,7k ohms resistor
one 330 ohms resistor
9V battery connector
You might also need some tools like a Soldering iron and some soldering tin.
Step 2: Circuits.
T1 and T2 are the resistors.
R4 is 330 ohm
R3 is 4,7k ohm
R2 is 560k ohm
R1 is 33k ohm
Step 3: Assembly
If you built the circuit board start soldering the parts on the board and make sure that the parts don't touch the other parts.
Step 4: How to Use
To use the lamptester put the testing wires on the lamp, polarity does'nt matter
if the led lights upp the lamp works.
Avoid touching the wires with your hand's the device is very sensitive.