Question about making simple voltage divider

[anonymous]

I need to build a simple voltage divider with a variable resistor. The
circuit has 3.2v DC and I need to install a pot so there's a variable output
between 1v and 1.5v DC

Assume I have 1K pot, would a 3K from +v to one side of the pot and 1500 ohm
from other side of the pot to ground work?

TIA

 

[Impmon]

On Sat, 25 Oct 2003 16:31:49 -0700, "Baphomet"
<fandaDEATH2SPAMMERS@catskill.net> typed:

You have stated (indirectly) that there is a 0.5 volt drop across the 1k
pot. I = E/R = 0.5/1k = 0.5 ma. Solving for the remaining two resistors is
easy. The resistor from pot to ground = 1 / 0.5 = 2k. The resistor from + to
the pot = 1.7/0.5 = 3.4k

Thank you. I was close and it does sound about right. I'll probably
use 3.3K resistor since it's the nearest common value and 2 1K in series
should get me 2K.
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[Baphomet]

"anonymous" <anonymous@anonymous.org> wrote in message
news:3f9acd39_3@newspeer2.tds.net...

I need to build a simple voltage divider with a variable resistor. The
circuit has 3.2v DC and I need to install a pot so there's a variable
output
between 1v and 1.5v DC

Assume I have 1K pot, would a 3K from +v to one side of the pot and 1500
ohm
from other side of the pot to ground work?

TIA

You have stated (indirectly) that there is a 0.5 volt drop across the 1k
pot. I = E/R = 0.5/1k = 0.5 ma. Solving for the remaining two resistors is
easy. The resistor from pot to ground = 1 / 0.5 = 2k. The resistor from + to
the pot = 1.7/0.5 = 3.4k

 

[James W]

The original poster failed to say what the 'wiper load' will be. Just
want to make sure OP considers this
- jim

Impmon wrote:

On Sat, 25 Oct 2003 16:31:49 -0700, "Baphomet"
fandaDEATH2SPAMMERS@catskill.net> typed:


You have stated (indirectly) that there is a 0.5 volt drop across the 1k
pot. I = E/R = 0.5/1k = 0.5 ma. Solving for the remaining two resistors is
easy. The resistor from pot to ground = 1 / 0.5 = 2k. The resistor from + to
the pot = 1.7/0.5 = 3.4k


Thank you. I was close and it does sound about right. I'll probably
use 3.3K resistor since it's the nearest common value and 2 1K in series
should get me 2K.