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interfacing buzzer with 8952

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manomarch

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hey!
how to interface a +5V buzzer with IC 89S52.
someone suggested me to use two bc547 npn transistor.
this is its schematic.


buzzer interface.png

i want to know basically what is this circuit doing?
 

manomarch

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ohk ! that means it can also be controlled with one transistor.
but what if we use two transistor as shown in the circuit.
 

tpetar

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Its buzzer you dont need two transistors. You can use second transistor if you have different voltages for buzzer and uC or something similar.

- - - Updated - - -

This thread is created in wrong group.
 

manomarch

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ok may be the circuit i was provided with was wrong or was for other purpose.
anyway i got your point.
thank you
 

tpetar

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learner71

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There are two types of buzzer.
1) Give Supply and get sound
2) Give Pulses and get sound.
 

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