555 IC Tester Circuit

This simple 555 IC testing-circuit tests your entire 555 timer IC, so before using your IC check immediately that your IC is good or bad by checking it. This can be done by checking the IC that is it is oscillating or not. Or you can use this circuit in some other circuits also to troubleshoot the proper working of 555 IC.

First of all insert the IC in socket very carefully so that no pin of 555 timer get damage. Now to see the result, switch on the power supply. 
If your 555 timer is working properly, both the LED1 and LED2 will glow.
And any of the LEDs is off or both LED1 and LED2 are not glowing means your 555 timer IC is faulty.

COMPONENTS USED :

• one 555 IC
• one 68K Resistance
• one 39K resistance
• two 220ohm resistance
• one 1uF Electrolytic capacitor
• one 1nf Ceramic capacitor
• two LED's (any color)