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                       COMPONENTS  USED: 

 

1.   MT8870 DTMF Decoder.

2.   IC 74154 (4:16 Decoder).

3.   IC 7473 J-K Flip Flop.

4.   IC 555 Timer.

5.   ULN2003  Relay Driver.

7.   IC 7404 NOT Gate.

8.   6V Adapter.

9.   Resistors (all 0.25 watt).

10. Capacitors.

11. Crystal oscillator (3.579MHz).

12. LED.

10. Relay.

11. Mobile phone headset connector.

12. Breadboard

13. Wires

14. Soldering equipments