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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Sat Dec 22, 2007 7:39 am Post subject: alternator/audio noise |
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Cheers,
In my dotage, I have this insatiable urge to expound my attitude to
the subject.
I invite the stalwarts to reject it, but it has helped me through several
score years of trouble-shooting and might help those less schooled in
electronics (a phase I'm approaching at a measureable rate).
Earphone communications equipment is usually assailed by audio freqs
from the alternator - because it wants to. Thus designers (lusting for
success) often attempt to include circuitry in their magic boxes which
thwart the influx of these noises. These attempts are undone by adding
another 'ground' outside the box. Like the doc asks, "does it hurt when you
do that?" and you say "yes", he replies, "Then don't do that" - make every
effort to let the 'box' solve the noise and ensure no other connection is
made to ground. As Bob (I think) says, much of the trouble comes from
inadvertent grounding outside the box.
Read this, unless the more educated of us shoots me down. Have at
me.
Cheers for the season,
Ferg
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nuckolls.bob(at)cox.net
Guest
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| Posted: Sat Dec 22, 2007 9:53 am Post subject: alternator/audio noise |
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At 10:38 AM 12/22/2007 -0500, you wrote:
| Quote: |
Cheers,
In my dotage, I have this insatiable urge to expound my attitude to
the subject.
I invite the stalwarts to reject it, but it has helped me through several
score years of trouble-shooting and might help those less schooled in
electronics (a phase I'm approaching at a measureable rate).
Earphone communications equipment is usually assailed by audio freqs
from the alternator - because it wants to. Thus designers (lusting for
success) often attempt to include circuitry in their magic boxes which
thwart the influx of these noises. These attempts are undone by adding
another 'ground' outside the box. Like the doc asks, "does it hurt when you
do that?" and you say "yes", he replies, "Then don't do that" - make every
effort to let the 'box' solve the noise and ensure no other connection is
made to ground. As Bob (I think) says, much of the trouble comes from
inadvertent grounding outside the box.
Read this, unless the more educated of us shoots me down. Have at
me.
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An astute observation given credence by your
now keen powers of observation and deduction
that only come with interest, dedication and
the ability to sort the puzzle of simple-ideas
for ways they fit together in useful inventions.
| Quote: | Cheers for the season,
|
. . . and to you also my friend.
Bob, K0DYH (for over 50 years)
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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