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"AND" gate - The "AND" gate requires all
the input legs to have a positive signal or high input to operate
the gate, and get a high output. So in the photo below, you would
need a high signal on "A" and "B" to get a high output at "C".
AND gate
"OR" gate - The "OR" gate requires
only one of the signal inputs to be high to receive a high output on
the other side of the gate. The "OR" gate will work like a "AND"
gate though if you have both inputs high, you will get a high
output. So in the photo below, you would need a high signal on "A"
and/or "B" to get a high output at "C".
OR gate
"NOT" gate - The NOT gate is an
electronic circuit that produces an inverted version of the input at
its output. It is an inverter. So what ever input it gets, it will
invert that signal.
NOT gate
"NAND" gate - The "NAND" gate works
the exact opposite of the "AND" gate. You need both inputs at
"A" and "B" to be high signals to get a low signal output at "C". If
you have any input as high, or both low, then you would get a high
signal. The little circle drawn on the output line represent the
inverter (NOT gate), which is what makes it possible to use two low
signals to get the output to be high.
NAND gate
"NOR" gate - The "NOR" gate works the
exact opposite of the "OR" gate. You need both input signals to be
low to receive the high output.
NOR gate
The gates can also be used in conjunction
with each other, so one input leg of an "OR" gate could have an "OR"
gate attached to it. Here's one example:
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