Ok I got my seismograph built and I used Larry's A/D card and =
filter/amp, My question is how do I know if I have to much gain?
It looked as if I did so I put 15k res at r29 this reduced noise but I =
don't know if it was to much. I can walk across my shop floor
30x 40x concrete slab and going to seismograph I see the trace go up =
about an inch then slowly go back to center when I walk away just the =
opposite, The trace seems to drift up and down a little guess this is =
normal??????
I really need help =20
this is before the damper and cover =
http://www.tsixroads.com/~spardue/seismograph/seismograph.htm
Ok I got my seismograph built and I =
used Larry's=20
A/D card and filter/amp, My question is how do I know if I have to much=20
gain?
It looked as if I did so I put 15k res =
at r29 this=20
reduced noise but I don't know if it was to much. I can walk across my =
shop=20
floor
30x 40x concrete slab and going to =
seismograph I=20
see the trace go up about an inch then slowly go back to center when I =
walk away=20
just the opposite, The trace seems to drift up and down a little =
guess this=20
is normal??????
I really need help