Homebrew PCBs

sorry Lads wrong forum

----- Original Message ----- 
From: "Thomas" <teecee@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, December 19, 2006 12:52 AM
Subject: Resistor Divider network using a multi turn Pot


>I was thinking about using a multiturn pot as a RD network to scale down 
>+5V to +2.5V for my Data Aq as some of the sensors are +5V, normaly I have 
>used 1% resistors or better but was wondering about a multiturn pot to do 
>this job, lets say that a 5k pot is set to somewhere in the middle of it 
>range at 2.5K ohms once this is set to show the correct scaling of 2.5V is 
>it always going to be good enough I mean will it be as good as the 1% 
>resistor setup ? my thoughts are that Temperature fluctuations or any 
>variations will affect the pot as whole keeping things in proportion and 
>scaled accordingly.
>
> Thanks
> Thomas