## Re: Potentiometers in Schematics

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• Re Pots, Take a look at :- http://www.geofex.com/article_folders/potsecrets/potscret.htm it should help. Sincerely Edwin A Alcock ... wires, ... the ...
Message 1 of 4 , Oct 1, 2008
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Re Pots,

Take a look at :-

http://www.geofex.com/article_folders/potsecrets/potscret.htm

it should help.

Sincerely

Edwin A Alcock

=======================

--- In Electronics_101@yahoogroups.com, "billshat44" <billshat44@...>
wrote:
>
> have seen 3 different views of potentiometers in schematics and
> would like to understand them. I think I understand two of them...I
> think. The first is the simplest to understand. There are 3
wires,
> one connected to each lead for the potentiometer. One outer edge
> lead goes to positive, the other outer edge goes to negative, and
the
> middle or wiper goes to the circuit that needs the variable
voltage.
> In the second, one outer lead goes to a component, the other outer
> lead goes to a power source (most of what I have seen has been
> negative) and the wiper goes to negative as well. This changes the
> voltage to the component. The third is what I am least unsure of.
> The circuit I have seen it in is the datasheet for the Texas
> Instruments LM317T. The pot goes from the adjustment lead of the
> lm317 to ground. A wire goes between the pot and the adjustment
> of the chip to a resistor to the output. The symbol is a resistor
> with an arrow thru it. I looks like there are only two leads to
wire
> in. Do I use the outer two wires, or one lead and the wiper or
> what? I know this is a very simple thing, but I still would like a
> basic understanding of what I am doing.
>
> have seen 3 different views of potentiometers in schematics and
> would like to understand them. I think I understand two of them...I
> think. The first is the simplest to understand. There are 3
wires,
> one connected to each lead for the potentiometer. One outer edge
> lead goes to positive, the other outer edge goes to negative, and
the
> middle or wiper goes to the circuit that needs the variable
voltage.
> In the second, one outer lead goes to a component, the other outer
> lead goes to a power source (most of what I have seen has been
> negative) and the wiper goes to negative as well. This changes the
> voltage to the component. The third is what I am least unsure of.
> The circuit I have seen it in is the datasheet for the Texas
> Instruments LM317T. The pot goes from the adjustment lead of the
> lm317 to ground. A wire goes between the pot and the adjustment