PSN-L Email List Message

Subject: Amplifier gains
From: "Ted Channel" tchannel@............
Date: Fri, 17 Dec 2010 05:50:26 -0700


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,







I was telling a friend, I would like to = try to=20 build my own amplifier/filter board.   He is knowledgeable in=20 electronic, and I am not.   So he said he would = help.   His=20 first question was about gain.
 
I told him I did not know what gain we = should=20 target, but some of the schematics indicated a gain of 2000.   = He=20 suggested  including a selector knob, with several gain=20 choices.
 
 
If we were to try is approach, what = would be some=20 of the typical values for gain?    500, 1000, 1500,=20 2000?
I know it depends on other factors, but = I am trying=20 to narrow it down.   We have a sensor with a strong coil, = strong=20 magnets, and are using Chris's magnet assembly on a 20 second=20 Lehman.
 
On Larry's board, which I love, works = perfectly,=20 the gain is selectable  from 200 to 9500?............I use it as it = is=20 shipped, so I don't know what the gain is........but it is perfect for = my=20 sensors.
 
Somewhere I have seen an amplifier with = a selector=20 knob, for gain, but I can't find it.
 
Thanks,
Ted

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