All About Circuits Forum  

Go Back   All About Circuits Forum > Electronics Forums > The Projects Forum

Notices

The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

Reply   Post New Thread
 
Thread Tools Display Modes
  #11  
Old 02-16-2011, 06:36 PM
wayneh wayneh is offline
Senior Member
 
Join Date: Sep 2010
Location: Roscoe, IL
Posts: 7,644
Default

Light gate is fine, and probably even easier for a DIY project, since you can buy pre-made "gap" modules. An old VCR I recently took apart had some in it.

You may still have a noise issue, though. You'll want to modulate the beam and reject anything not coming into the receiver on the beam. That'll reject ambient noise. And you may need to have some sort of timer circuit to lock out switching for a brief period after one pulse has been detected, so that a slow pass doesn't turn into multiple triggers. The challenge will be to prevent multiple pulses while still allowing the meter to read to high rpm. I think it might work fine all by itself, but it's something to watch out for.
Reply With Quote
Reply   Post New Thread

Tags
, , ,


Related Site Pages
Section Title
Worksheet AC motor theory
Worksheet AC generator theory
Textbook Tesla polyphase induction motors : Ac Motors
Textbook Stepper motors : Ac Motors
Textbook Synchronous Motors : Ac Motors
Worksheet DC motor control circuits
Textbook Voltage regulation : Transformers
Textbook Special transformers and applications : Transformers
Worksheet Magnetism
Textbook Measurements of AC magnitude : Basic Ac Theory


Similar Threads
Thread Thread Starter Forum Replies Last Post
Circuit to measure wind speed. nerdegutta General Electronics Chat 11 07-15-2010 06:25 PM
Wind Turbines - Consumer Rated retched The Projects Forum 12 01-13-2010 10:17 PM
How to wind a DC speed coil Peerless The Projects Forum 4 04-10-2008 05:49 PM
Wind Speed Sensor nanobyte General Electronics Chat 7 06-07-2006 09:22 PM

Thread Tools
Display Modes

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

Forum Jump


All times are GMT. The time now is 08:48 AM.


User-posted content, unless source quoted, is licensed under a Creative Commons Public Domain License.
Powered by vBulletin
Copyright ©2000 - 2014, vBulletin Solutions, Inc.