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Hi guys, sorry I've been "out of the way" for a few weeks on business *Wheeee, ducks another incoming 
**.
I have a small request of whoever does the PCB for this, and that is this; PLEASE can you make it thru' hole, and ALSO, remember to put guard rings around ALL op-amp inputs. If you can make it FIVE layer (yes I know EXPENSIVE) then make the TOP, MIDDLE and BOTTOM layers ground planes. Make the signal entry to the Op-Amps via resistors on stand-offs if possible. I want to see HOW low we can get the noise levels on this design.
Feel free to change the Op-Amps (I tried Linear LTC1007 Ultra Low Noise types in a design recently, BIG gains in sensitivity and drop in background noise).
Slight problem with the Protel file, the laptop it was on is now part of some foreign soil (I lent it to a friend and the vehicle it was in took a direct hit from an RPG in Afghanistan) so the hard drive is probably somewhere out in the desert outside Kandahar or bits of it are!. You're welcome to help me look for it
but somehow I get the feeling it's going to stay there forever.
Being me I didn't have any backups either
so it's going ot have to be a trace it out job.
I'll help all I can but I'm not here most weeks at the for the next few months. Let me know how you get on.
**.I have a small request of whoever does the PCB for this, and that is this; PLEASE can you make it thru' hole, and ALSO, remember to put guard rings around ALL op-amp inputs. If you can make it FIVE layer (yes I know EXPENSIVE) then make the TOP, MIDDLE and BOTTOM layers ground planes. Make the signal entry to the Op-Amps via resistors on stand-offs if possible. I want to see HOW low we can get the noise levels on this design.
Feel free to change the Op-Amps (I tried Linear LTC1007 Ultra Low Noise types in a design recently, BIG gains in sensitivity and drop in background noise).
Slight problem with the Protel file, the laptop it was on is now part of some foreign soil (I lent it to a friend and the vehicle it was in took a direct hit from an RPG in Afghanistan) so the hard drive is probably somewhere out in the desert outside Kandahar or bits of it are!. You're welcome to help me look for it
but somehow I get the feeling it's going to stay there forever.Being me I didn't have any backups either
so it's going ot have to be a trace it out job.I'll help all I can but I'm not here most weeks at the for the next few months. Let me know how you get on.
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