[AT] Noise Concerns

[Steve W.]

charlie hill wrote:
> Herb,  your message came to me as a weird attachment but I was able to
> open and read it.  I spent thousands of hours driving trucks with Detroits 
> and
> they are loud.  I have no doubt that they also affected my hearing but the 
> noise
> those turbos make is at the top or or above human hearing range and if that 
> is
> what got me it did a number on me.   I hear a constant ringing that is so 
> high
> pitched that I don't know what to compare it to.  It's up above crickets 
> singing
> but it's like an electronic imitation of crickets at a higher frequency.
> 
> Charlie

Sounds like we hear the same choir Charlie.

I did find one thing that worked to quiet it some. I made a cheap 
oscillator out of a 555 timer and can adjust the frequency. If I tweak 
it just right it reaches a zero beat with the ringing in my head an the 
noises go away for 1/2 hour or so.

-- 
Steve W.