Need help with amplifier for speaker from PIC plz

[abkrenoo14]

Hello​

If I may, I need a circuit to amplify the sound of my speaker (that is 4oms & 4.5W).
Meaning, my speaker sound is low because I take the signal from PIC direct.
So, I need a circuit to make the signal from PIC adapt better with my speaker.

 

[Resqueline]

That may draw as much as 1A from a 5V supply and will be very loud. Are you making a siren?
If not, and you only want a beep, you might want to use a piezo disc instead of a big dynamic speaker.

 

[abkrenoo14]

i will use it siren get look in it
http://www.multiupload.com/J9SV1D4DGW
what i can do

 

[Resqueline]

Ok, that is a rar file and I don't want to take the time unRARing it right now.
Let me just ask you what power supplies are available in your circuit, and do you want to keep it very simple & cheap or could you want to use an integrated amplifier?

 

[abkrenoo14]

i want to keep it simple & cheap i take power from usb from pc or (nokia charger) mean 5V only can u give me ur email to chat easly my email [email protected]

 

[abkrenoo14]

abkrin00@ya

 

[Resqueline]

Simple & cheap means you'll use a capacitor, a resistor, & a MOSFET. The USB power from a PC is usually limited to a tenth of what you'd want though.
I can not allow myself the time to chat individually, but there may be others here that will do it. The main purpose of this board is to keep it in the open though.

 

[abkrenoo14]

Thank you but I need an engineer because i learn myself, and there are things that stop me and I need to help others.
And what about integrated amplifier

 

[abkrenoo14]

i am sorry but i try this circuit in proteus (isis) in my circuit but it didn't work
see my error
http://www.multiupload.com/4S4X321MNA

 

[abkrenoo14]

sorry http://www.multiupload.com/5OUF8FF1QE

 

[jackorocko]

Screw the simulation software, ask the people who make proteus. That circuit by resqueline will work. It is so simple you don't need simulation software to see how it works.

The pic either turns the mosfet on or off which allows current to flow across the speaker. Think light switch.