Introduction: How to Make a Very Simple NPN Transistor Tester

By

in this instructable i will show you how to make a very simple NPN transistor tester.

Step 1: You Will Need:

a NPN transistor (to test) 
a 10K OHM resistor
a 470 OHM resistor
a LED
a on/off switch
and a 9V battery (5-12V)

Step 2: Making It.

here are the schematics. and a picture of my finished product.