| Home | Terms of Use | Site Map | Contact Us |
IndustryCommunity.com > Electrical and Electronic Community > Analog Circuit Design Forum > Message
Main Menu
Find

[ List Subjects ][ Main Page ]
[ View Followups ][ Post Followup ]

Subject: Re: Current Sensing Circuit Help!

Date: 10/15/02 at 5:37 PM
Posted by: Russ Kincaid
E-mail: russlk@netzero.com
Message Posted:

In Reply to: Current Sensing Circuit Help! posted by laet on 10/15/02 at 9:05 AM:

The LM336 is not going to work, it is a 2.5 volt reference. The LM339 or LM393 comparator is the thing to use. You need a sense resistor and a bias voltage in order to discriminate between current and no current. Set the bias voltage at 10 millivolts at the minus input of the comparator. Choose a sense resistor that will provide 20 millivolts at the positive input, relative to ground. Connect the LED in series with a suitable resistor from the output to VCC.


Follow Ups:


Post a Follow-up:

Name:
E-Mail:
Subject:

Message to Post:

 

1999-2001 Sunlit Technology Co., Ltd. All rights reserved.