Electronic buzzer circuit using IC

Electronic buzzer circuit

Needed

A switch

10K resistor

0.01uf capasitor * 2

1uf/15v capasitor

8ohm 0.5W speaker

5v-15v voltage resource
NE555 ic

56K resistor

Now the time for making circuit

What is NE555 IC

The 8-pin 555 timer must be one of the most useful ICs ever made and it is used in many projects. With just a few external components it can be used to build many circuits, not all of them involve timing. A popular version is the NE555 and this is suitable in most cases where a '555 timer' is specified. Low power versions, such as the ICM7555, are available with the same pin arrangement but their maximum output current is much lower and they should only be used when specified. The 555 can be used in several circuits. Astable- producing a square wave for flashing LEDs, making sounds, driving counters etc.Monostable - producing a single pulse when triggered, this can used for timing.Bistable - a simple memory with two states.Buffer - an inverting buffer (NOT gate).

Connecting

A loudspeaker may be connected to the output of a 555 astable circuit but a capacitor (about 100µF) must be connected in series. The astable output is equivalent to a steady DC of about 0.5Vs combined with a square wave AC signal. The capacitor blocks the DC, but allows the AC to pass as explained in capasitor coupling. Piezo transducers may be connected directly to the output and do not require a capacitor in series.

Speaker

For almost every speaker or set of headphones you can buy, you'll find a specification for impedance measured in ohms. But the packaging or included product manuals tend to never explain what impedance means or why it matters. Fortunately, impedance is kind of like great rock'n'roll. Trying to understand everything about it can be complicated, but one doesn't need to understand everything about it to get it.

Comments

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