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Often in computer controlled systems, you would like to generate a “click” sound
whenever a button is pressed. This provides the user with audible feedback
that the pushbutton press has been acknowledged. The two circuits below
generate such a sound. A click sound is generated each time the logic input
swings from a logic low to high condition.
I
have two different click generator versions. One circuit uses a piezoelectric type
beeper and draws very little power. The second uses a miniature speaker, which
can be powered from a voltage ranging from 5v to 12v and can generate a louder sound.
Both circuits produce the click sound by gating a short 3 to 4 cycle burst of a 2KHz
to 2.5KHz oscillator to the sound generating device. In the future I will show
how this circuit can be handy in giving a user a sensor level indication by the
controlling the number of clicks per second. The old Geiger counter is one
example where clicks are used this way. In that case, the click rate provided
the user with an idea of the level of radiation.
Click on Drawing Below to view PDF version of Schematic
