The circuit is using four LEDs which will blink if the IC is in good condition and if any LED is not blinking then it will show that the IC is not in good working condition. The operating voltage of the circuit is 5 to 12V DC.
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A 556 dual timer tester circuit is also an important circuit to have in your electronics lab if you are making projects with 556 dual timer IC. A 556 IC contains two 555 timer ICs in one package so before using it in any project it is essential to check it to confirm that the IC is working correctly.

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556 Dual Timer Tester Circuit Diagram
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