Re: Electrometer design? (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 06 Jul 2004 10:40:57 +0930
From: Matthew Smith <matt@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Electrometer design? (fwd)


> I am currently examining a design which appeared in the July 1999
> Amateur Scientist section of Scientific American with a view to
> building several. The circuit is basically a transconductance amp
> which amplifies tiny currents which are then converted to a voltage,
> rectified and peak detected. I suggest having a look at that design
> and possibly throwing away the current set of electronics if it is
> too difficult to repair (I suspect it isn't ;)

I had a look at that and a few others - looks very interesting.  The Scientific
American article is available through their site and is also on the Tinkers
Guild Amateur Scientist CD, for those that have it.

To me, building a fast rotating assembly is rather scary - I was thinking of
building one of these myself, but may get the blade assemblies made by an expert...

A device like this would top off the other environmental monitoring devices that
I'm building quite nicely.

Cheers

M

-- 
Matthew Smith
Kadina Business Consultancy
South Australia