Dual Tone Train Horn Circuit – Description
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 nothing but cascading two 555’s in one package and each timers works independently. Switch S1 can be used to start the horn. The circuit is simple and low cost but works greatly.
Circuit Diagram & Parts List
|K1||8 Ohms Speaker|
|S1||Push Button Switch|
- The output from the dual tone train horn is more than enough to drive a small loudspeaker directly. All you need to do is connect the circuit to a 9V DC power supply or a battery.
- Assemble the circuit on a good quality PCB or common board. Constructing a bread board prototype is recommended.
This circuit can be modified to make the train horn turn ON when the train is about to reach different stations, level crossings, single lane tracks and so on. In the circuit above, a Switch (S1) is used to manually and momentarily turn on the two-tone horn. This horn can be turned ON automatically at certain points on the track by mounting a reed switches under the track at the point where the horn is to be heard. The reed switch will turn ON if the magnet is placed on the bottom of the train and it passes through the track. All you have to do is place the reed switch in such a way that it faces upwards.
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