Two-Tone Train Horn
With this circuit you can electronically simulate the noise of a diesel-train horn. The sound is triggered
automatically as the train reaches a desired place on the track so you can produce the sound as the train approaches
stations, level crossings, etc.
The circuit can be built simply by using one 556 or two 555 timers. The rest of the parts are readily available and
not critical. The output power from the two-Tone train horn is adequate to drive a miniature loudspeaker directly so
all that is required is a single 9V alkaline battery or a 9VDC wall-adaptor.
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Copyright © 1995 - Tony van Roon