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NNTP-Posting-Date: Tue, 29 Oct 2002 20:00:37 -0600
From: "David Jones"
Subject: how to tell when forward bias?
Date: Tue, 29 Oct 2002 20:56:37 -0500
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lets say theres a circuit like the following
----------10k resistor-----------(gate to SCR) -------800ohm
lets say there is a -9 voltage on the right. wouldn't that make the SCR
gate negative? I've been told it makes it positive. and why would it be
positive? the gate is connected to both the positive and negative leads.
one person told me that the gate needs to be positive relative to the
cathode. well wouldn't that be true even if you disconnected the positive
lead from the gate of the SCR because the 800ohm resisitor would make the
voltage to the gate drop below the voltage of the cathode. That means it
would be positive right? I am totally and utterly confused here. I can't
understand even the simplest circuits well because of this junk. could
someone tell me a fool proof way to think of circuits like this, including
transistors and such, so that I can't possibly get confused?
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