Steam Whistle Sound Generator Circuit

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Steam Whistle Sound Generator Circuit diagram

This is the circuit diagram of steam whistle sound generator. This circuit contains six square wave oscillators. Square waves are composed of a huge variety of harmonics. If six square waves with various frequencies are added collectively, the final result is going to be a signal which has a very large number of frequencies. When you listen to the result you will find out that it happens to be very identical to a steam whistle sound. The circuit ought to be beneficial in modelling or even in a sound studio. This circuit works by using only two ICs. The first IC, a 40106, consists of six Schmitt triggers, that are all set up as oscillators. Various frequencies are produced from the utilization of various feedback resistors.

The output signals from the Schmitt triggers are mixed via resistors. The resulting signal is amplified by IC2, an LM386. This IC can deliver audio power of about 1 W , which should be enough for driving the loudspeaker for most sound related electronic circuit. In case you leave out R13 and all parts after P1, the output can then be connected to a more strong amplifier. In this way a definitely deafening steam whistle could be made. The ‘frequency’ of the signal could be altered with P2, and P1 is used to control the volume.

Steam whistle sound generator circuit source: extremecircuits.net

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