monitor voltage input - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 24th March 2009, 03:16 PM   #1
kirtm is offline kirtm  United States
diyAudio Member
Join Date: Mar 2009
Default monitor voltage input

I have been tasked to design a piece of test equipment to test an Lm338 circuit used as a current limiter. I would like to monitor (LED?) a variable input supply (+4 to +20VDC) (2.0A) through a switch that would supply the LM338 circuit. Something that would show that power was supplied to the circuit. Any suggestions? Thanks.
  Reply With Quote
Old 10th April 2009, 03:28 PM   #2
diyAudio Member
Fuzzymuff's Avatar
Join Date: Mar 2009
Default c here
Wrap it in foil, and plug it in.
  Reply With Quote
Old 10th April 2009, 04:55 PM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
a LED with a couple of series diodes and a resistor (3k) will do that.
The 1.6V LED (red) + 1.4V (two diodes) will be off @ <=3V.
At maximum voltage it will be very bright. At minimum voltage it will be very dim.

You could replace the two diodes with a two terminal CCS. Buy a 5mA CCS it will show constant brightness >=6V and dim as 4V approaches.
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Monitor input level Mickey-2002 Digital Source 0 26th July 2006 01:32 PM

New To Site? Need Help?

All times are GMT. The time now is 10:10 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2