The original PSN amp by Pete Rowe can be found at
http://pw2.netcom.com/~shammon1/equip.htm#Electronics and is simple to
build and works very well. You can substitute the op-27 for any low
noise op amps if you cannot find them. I have used this design for more
than 10 years and the only area I have trouble with is getting leveling
pot in the filter stage to work correctly. Look for two sheets on this
web page, one is the pre amp that is mounted near the seismograph and
then connected via low noise cable to the filter board mounted near the
A/D and PC. 
Regards, Steve Hammond PSN San Jose, Aptos CA. 

-----Original Message-----
From: psnlist-request@..............
[mailto:psnlist-request@............... On Behalf Of Ted Channel
Sent: Wednesday, December 15, 2010 7:43 AM
To: psnlist@..............
Subject: Amplifier



Hi  Folks.   I have use only Larry's Amp boards and I have been very
happy 
with them.    I have tried to build my own, but never had much luck.   I

wish to try again.
Does anyone have a simple, yet proven to work, amp schematic?    I have
seen 
some in the past, but I am looking for one, which is known to work first

time out.

I know I will need to order all the parts, so a parts list would also be

helpful.   Especially, on how to power the op amps, and necessary
filter.

Thanks, Ted 

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