pic port amplify

[gatoulisss]

hello guys!!
i have a question.
im using pic 16f88 connected to some sensors and a buzzer its like an alarm, my question is can i amplify the output of the pin witch is connected to the buzzer so i can have much louder sound? (the sound driver is the pic so the buzzer is not making any sound if i just connect it to a battey) for example the port output is +5v can i make it +9 and how?

thank you very much!

[johm]

One of your solutions is using an off the shelf NPN transistor (2n2222, 2n3904, BC548, etc.) wired like this:

An NPN Transistor behaves like a current switch / current amplifier. The higher current any output pin of the PIC16F88 can sink/source is 25mA, as in pg. 161 http://ww1.microchip.com/downloads/en/DeviceDoc/30487D.pdf so this will allow a higher current to flow from the collector to the emitter of the transistor resulting in louder sound.

In case you don't understand something, feel free to ask.

Regards,
Johm

[gatoulisss]

i tried with bc547 transistor and it works on some buzzers but in this type is not http://www.ebay.com/itm/231141835644?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT any idea?

and is there any way to amplify the buzzer using a transformer? and how i can make the connections?

[johm]

Using a transformer is an overkill, what's more, you'll have to add a DC voltage for the buzzer to work. Have you got the datasheet for this particular buzzer? Take a look at its impedance and operating voltage.

[gatoulisss]

i had the buzzer of the foto and is loud as i want to be and it use an transformer... so i think that using transformer in the ones i got would give me the loudness i want. so how i can make this?