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Need help with amplifier for speaker from PIC plz

abkrenoo14

Sep 16, 2011
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Sep 16, 2011
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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.

:confused::confused::confused::confused::confused::confused::confused::confused::confused:
 
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Resqueline

Jul 31, 2009
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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.
 

Resqueline

Jul 31, 2009
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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?
 

Resqueline

Jul 31, 2009
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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.
 

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abkrenoo14

Sep 16, 2011
7
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Sep 16, 2011
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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
 

jackorocko

Apr 4, 2010
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Apr 4, 2010
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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.
 
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