UM66 Music Generator Circuit

This is the UM66 music generator circuit, of course this circuit uses UM66 as the main component to generate the signal of music / melody. UM66 operates on a supply voltage of 3V. The required 3V supply is given through a zener regulator. The transistor Q1 and Q2 is a push pull amplifier to drive the loudspeaker, so the music signal from pin 1 IC UM66 can be heard loudly. A class A amplifier can be used before push pull amplifier to minimize the noise and improve the output sound quality. UM66 is a 3 pin IC package just looks like a BC547 transistor.

Multitone Alarm Sound Generator

Here the Multitone Alarm sound generator. This kind of multitone alarm is useful for security alarms, reverse horns, and so on. It generates five various sound tones and is also considerably more ear-catching when compared to a single-tone alarm.

Steam Whistle Sound Generator Circuit

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.