PSN-L Email List Message

Subject: Re: Amplifier gains
From: Geoffrey gmvoeth@...........
Date: Sun, 19 Dec 2010 22:59:23 +0000


It seems so simple to me,
just hook up everything and increase the gain
until the noise is seen and possibly
to the most noise you can take
as acceptable. To me that is possibly
less that 6 counts peak on the average.
You will notice a sensitivity in the
hundreds of nanovolt range coming in
from the sensor.

-----Original Message----- 
From: Ted Channel
Sent: Friday, December 17, 2010 12:50 PM
To: psnlist@..............
Subject: Amplifier gains


I was telling a friend, I would like to try to build my own amplifier/filter board.   He is knowledgeable in electronic, and I am 
not.   So he said he would help.   His first question was about gain.

I told him I did not know what gain we should target, but some of the schematics indicated a gain of 2000.   He suggested  including 
a selector knob, with several gain choices.


If we were to try is approach, what would be some of the typical values for gain?    500, 1000, 1500, 2000?
I know it depends on other factors, but I am trying to narrow it down.   We have a sensor with a strong coil, strong magnets, and 
are using Chris's magnet assembly on a 20 second Lehman.

On Larry's board, which I love, works perfectly, the gain is selectable  from 200 to 9500?............I use it as it is shipped, so 
I don't know what the gain is........but it is perfect for my sensors.

Somewhere I have seen an amplifier with a selector knob, for gain, but I can't find it.

Thanks,
Ted 

__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.

[ Top ] [ Back ] [ Home Page ]