In a message dated 19/01/2007, n0ssy@........... writes:

Hopefully you have a Lowes hardware close by.  Look for a spring with
the part number of "C 311". It's 1/2" dia and  about 11" (?) long. You will 
have to cut the spring to size after you have  everything assembled. I have not 
heard about any
temperature sensitive problems and I don't have  any, but this maybe because 
it is enclosed in a heat stabilized  enclosure.



Hi Tom,
 
    Steel springs are quite temperature sensitive, but  this is not a problem 
if you are only looking for a 1.5 sec period, like on an  AS-1. It gets to be 
a problem if you try to extend the period beyond about 5  seconds. Using 
about this period makes designing a long period compensating  amplifier much 
easier. See _http://jclahr.com/science/psn/roberts/index.html_ 
(http://jclahr.com/science/psn/roberts/index.html) 
 
    Regards,
 
    Chris






In a message dated 19/01/2007, n0ssy@........... writes:
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Hopefully you have a Lowes hardware close=
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  Look for a spring with
  
the part number of "C 311". It's 1/2" dia=
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  about 11" (?) long. You will have to cut the spring to size after you have=
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  everything assembled. I have not heard about any
  
temperature sensitive problems and I don'=
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  any, but this maybe because it is enclosed in a heat stabilized=20
  enclosure.

Hi Tom,
 
    Steel springs are quite temperature sensitive,=20=
but=20
this is not a problem if you are only looking for a 1.5 sec period, like on=20=
an=20
AS-1. It gets to be a problem if you try to extend the period beyond about 5=
=20
seconds. Using about this period makes designing a long period compensating=20
amplifier much easier. See http://jclahr.com/=
science/psn/roberts/index.html
 
    Regards,
 
    Chris