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From: Tony Williams
Subject: Re: Strange going-on with a floating MOSFET gate
Date: Sun, 05 Jan 2003 09:18:07 +0000 (GMT)
NNTP-Posting-Date: Sun, 5 Jan 2003 10:45:37 +0000 (UTC)
User-Agent: Pluto/1.14i (RISC-OS/3.60)
In article ,
Winfield Hill wrote:
> But what I didn't expect was what happened immediately when removing
> the clip lead to the gate. Without fail the current would instantly
> drop by about 2x, indicating a roughly -75mV change in gate voltage.
> Sometimes it would shut off, indicating a larger gate-voltage drop.
> This effect was independent of the drain voltage (the same whether
> it was positive or negative with respect to the gate) or the drain
> current (over the 100x range I tried). This -75mV change indicated
> that about 4.5pC of charge was being removed from the gate by my
> action each time (say 3 to 10pC), which was a surprise to me.
If you offered your hand (and croc clip) back to the
gate (without actually connecting to it) did you get
the corresponding +75mV change on the gate voltage?
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