----- Original Message ----- 
From: "Jinx" <joecolquitt@clear.net.nz>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, November 05, 2009 1:36 AM
Subject: Re: [EE] Amplifying a PWM signal


>> want to amplify the signal's current and feed it into a speaker.
>
> Dumitru, what is the speaker impedance and have you tried the
> transistor on the low side (and without the 1k) ?

It should work, but then you get a big DC-component through the speaker.
This heats the speaker and also diminish the max power from the speaker.
Jo
>




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