Re: Realizations with transistors and capacitors in an emitter follower
- From: NoSpam@xxxxxxxxxxx (Bob Masta)
- Date: Fri, 29 Feb 2008 13:21:43 GMT
On Thu, 28 Feb 2008 10:51:13 -0800 (PST), ShamShoon <mhs000@xxxxxxxxx>
wrote:
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.
Actually, the speakers *do* have a polarity. It's human hearing
that doesn't have a polarity (much). For most sounds, you can't
tell the difference between normal and inverted. You can tell on
isolated loud bass drum hits, if you have a switch so you can
easily change polarity, but it's not a huge difference and it's
not obvious which polarity is "right" under most circumstances.
Speaker polarity is critial for stereo. What matters is that both
speakers be wired the same way. If you reverse one, the low
frequency output will be reduced because one is moving out while
the other is moving in, essentially cancelling each other.
Best regards,
Bob Masta
DAQARTA v3.50
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, FREE Signal Generator
Science with your sound card!
.
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