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This is a Simple 555 Tester Circuit Diagram. The IC 555 is a widely used timers, control circuits, PWM, alarms, etc.. Often we set up a circuit that does not work or works differently than expected, this time the ideal is a test circuit for this IC.  This test circuit 555 is connected as an astable multivibrator when the button switch S1 is pressed, the LEDs D1 and D2 flash alternately. Ie, when the output is high D2 will light when the output is low D3 will light, and the other a Hi Lo. The speed of flashes is determined by the components R1, R2 and C1.Pressing the S1 test the 555 starts and any change in the IC flashes may consider to be defective.

555 timer tester is a simple circuit that serves to test the condition of IC 555. 555 timer circuit tester, in principle, start the timer 555 in astable multivibrator mode. As an indicator of the status of the timer 555 good condition or damaged to use 2 pieces LED which will light up in a blink alternately when the timer 555 in good condition. And only one will turn on or off all the timer 555 when the condition is broken. 555 timer circuit tester is powered using 9 Volt DC voltage source. Complete circuit tester 555 as follows.   How to use 555 timer tester is in conjuction with IC 555 to test the existing IC socket according to the order button. Then activate the power switch to begin testing the 555 timer ic. Then live we observe the LED indicators 2 before, whether flashing alternately (good) or not blink or even die all (timer 555 damaged). source:link