Re: Realizations with transistors and capacitors in an emitter follower
- From: "BobW" <nimby_NEEDSPAM@xxxxxxxxxxxxxx>
- Date: Thu, 28 Feb 2008 14:11:35 -0800
"ShamShoon" <mhs000@xxxxxxxxx> wrote in message
news:4f451149-a73d-4ace-bad2-5fa4e45d79e7@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Last thing I did in my quest for learning about simple amplifiers was
the common emitter amplifier. The output is opposite of polarity to
the input. I thought that would be fun to try to have the voice
reversed. However after trying it I realized that speakers don't
really have a polarity (despite the clear + & - signs on the speaker)
which makes sense. The output of the CE amp was very good. I had a
blast when I added a potentiometer in place of the collector resistor,
and used it to amplify my little Mp3 player signal before it gets into
my car. It used to be not powerful enough to drive the car sound
system and I had to crank the volume all the way up.
No more! this simple circuit worked and it worked beautifully! Now I
have an amplifier with volume control and very simple, one transistor,
one OpAmp, and a few resistors and capacitors, and a battery. Sound
quality is not bad but certainly much better than I expected with such
a simple configuration. The only thing I need now is to figure out how
to reduce the power (actually I need to calculate it), because I don't
want it to drain the battery quick!
Go learn what class B or class D amplifier is.
Bob
.
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