spacer spacer spacer spacer

resistor 5v to 2.8v and 2.0v

Post ReplyPost New Topic
< Prev Topic Next Topic >
Member - Posts: 2
Member spacespace
Joined: February 10, 2011
Posted: March 17, 2011 at 10:19 PM / IP Logged  

Can someone explain what this statment means? I don't understand where both ends of the resisters are being connected? are all resisters connected at one end to 5v source and the other leg to pin (23) and (16) There are 4 resistors and only two connection points?

33k resistor to +5v

(23) and 22k resistor to gnd(16) to obtain 2v and 33k to +5v and

47k to gnd to obtain 2.8v

i am an idiot 
Platinum - Posts: 13,674
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: March 18, 2011 at 5:57 AM / IP Logged  
What are you trying to do?
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: February 18, 2012 at 2:19 PM / IP Logged  
It sounds like a voltage divider.
For the first voltage, connect one side of the 33K resistor to 5vdc and the other side to (23) and one leg of a 22K resistor. Connect the other side of the 22K resistor to ground. Where the 33K and 22K resistors connect there will be 2vdc on that connection (according to the voltage divider formula).
For the next voltage connect one leg of a 33K resistor to 5vdc and connect the other leg to the 47K resistor. However, according to the formula this will give you 2.938vdc where the 33K and 47K connect. To get 2.8vdc you would need a 42K resistor.
There is a great voltage divider calculator here:
Voltage dividers are great for voltage references, but they can not be used to drive anything. This is because the resistors restrict current to virtually nothing. Even trying to pull 1mA you'll pull your voltage way down!
Kevin Pierson

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Follow Follow on Facebook
Saturday, May 25, 2024 • Copyright © 1999-2024, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo spacer spacer spacer
Top spacer spacer