A dual tone train horn simulator circuit can be made using two NE 555 timers connected in cascade.Here instead of using two NE 555 timers a single NE 556 timer is used which is a nothing but two 555’s in one package and each timers work independently.Switch S1 can be used to start the horn.The circuit is simple and low cost but works greatly.
Circuit Diagram & Parts List.
- Use a 9V DC power supply or battery for this circuit.
- Assemble the circuit on a good quality PCB or common board.Constructing a bread board prototype is recommended.
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