Previous in Forum: Communications & Electronics   Next in Forum: LDO and Linear Regulator
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
4 comments
Rate Comments: Nested
sujith15bpl
Participant

Join Date: Jul 2008
Posts: 1

Variable Current Source

07/11/2008 5:32 AM

hello, my name is sujith, i need a variable current source with a range of 1ma to 10 ma. i am all ready got the diagram of 4 to 20 ma, but i need variation from 1 ma. so kindly send any diagram which you have with this facility

sujith15bpl@gmail.com
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
cnpower
Guru
Engineering Fields - Control Engineering - New Member China - Member - New Member

Join Date: Sep 2006
Location: CHINA
Posts: 2945
Good Answers: 14
#1

Re: variable current source

07/11/2008 6:04 AM

put forward your diagram here at first, so we can change it into 1-10ma

in fact the 4-20ma is a standard interface circuit.

you can change resistor to satisfy iwth your need.
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#2

Re: variable current source

07/11/2008 7:38 AM

Most proprietary 4-20mA current sources have a 0-20mA setting.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Anonymous Poster
#3

Re: Variable Current Source

07/11/2008 11:31 PM

Simple bipolar transistor is current source with the collector being the current source which current is regulated by the base current that can be varied by variable Vbe voltage over serial resistor.
Register to Reply
feridun
Power-User

Join Date: Jun 2008
Location: TR
Posts: 142
Good Answers: 1
#4

Re: Variable Current Source

07/12/2008 3:46 PM

There is necessarily a block anywhere in the shematic that provides offset to start with 4mA. If you can determine these parts then you can fix the problem or put your diagram here that we can fix it for you as cnpower said.
Register to Reply
Register to Reply
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); cnpower (1); feridun (1); PWSlack (1)

Previous in Forum: Communications & Electronics   Next in Forum: LDO and Linear Regulator

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Communications & Electronics:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (103 right now)
Show Members
Advertisement