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RE: Water probe: improvements

Original poster: "Aron Koscho" <kc5uto@xxxxxx>


Have you considered using low capacitance diodes to clamp the input?
I've been using 1N34A's for some time without any problems. This is an
interesting project you've undertaken; I can't wait to see how it turns



-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, January 04, 2005 8:57 AM
To: tesla@xxxxxxxxxx
Subject: RE: Water probe: improvements

Original poster: "Denicolai, Marco" <Marco.Denicolai@xxxxxxxxxxx>

>The original capacitance of the lower voltage arm of the divider is
>about 500 pF. The capacitance of the schottky diodes I added (one
>between input and V+, the other between input and V-) is 50 pF. So two
>of them makes 100 pF.
>I am really not confident the amplifier would last a second without
>if the TC is turned on.