Laser Pointers



Welcome to Laser Pointer Forums!

Top 50 Laser Pointer Companies - Green Lasers Top 50 Laser Pointer Companies - Blue Lasers Top 50 Laser Pointer Companies - Red Lasers
Top 50 Laser Pointer Companies - Yellow Lasers Top 50 Laser Pointer Companies - Purple Lasers Top 50 Laser Pointer Companies - Orange Lasers
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes



Go Back   Laser Pointer Forums - Discuss Laser Pointers > Off-Topic > Geeks' Corner

Sci-Fi-Lasers
Reply
 
LinkBack Thread Tools Display Modes
Old 01-13-2012, 12:56 AM   #1
Class 1M Laser
 
Join Date: Feb 2011
Posts: 167
Rep Power: 5
Lascannon will become famous soon enoughLascannon will become famous soon enough
Default Help with voltage monitor alarm please.

Hey guys! I'm back.

I need this to be short so here we go:

My friend has set up a wind-turbine to power his house off-the-grid style, and he wants to set up an alarm to tell him when the voltage goes to 12.6/12.7 . He would like to to be variable (a simple potentiometer would suffice) and he does NOT have a large budget for this project. Thats why he asked me. I never buy anything new, what college student can? And have allways salvaged and built anything I need.

But this one has me stumped. I know they make them, but the ones I saw were 200 USD and that is insane.

So I ask you:

What simple electrical circuit can alert the household when the voltage from a 12V battery bank has dropped to 12.6?

Thanks guys! I know I can allways count on you to be polite, to the point, and kind even in the face of my obviously basic electronic "knowledge".
Lascannon is offline   Reply With Quote


lpp

Green Laser Companies

Blue Laser Companies

Red Laser Companies


Old 01-13-2012, 02:02 AM   #2
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,503
Rep Power: 653
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Re: Help with voltage monitor alarm please.

Google for an opamp comparator circuit. Would be your best bet. You can also get voltage alarms for cars and stuff, though I don't know if they are adjustable.
Things is offline   Reply With Quote
Old 01-13-2012, 02:35 AM   #3
Class 1M Laser
 
Join Date: Feb 2011
Posts: 167
Rep Power: 5
Lascannon will become famous soon enoughLascannon will become famous soon enough
Default Re: Help with voltage monitor alarm please.

Will this work?

Low Battery Alarm Car 12VDC Project Kit DIY | eBay
Lascannon is offline   Reply With Quote
Old 01-13-2012, 04:24 AM   #4
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,503
Rep Power: 653
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Re: Help with voltage monitor alarm please.

Not directly, but you could probably modify it to work. I couldn't say how though, as I don't have one. I think I've seen over voltage alarms too.
Things is offline   Reply With Quote
Old 01-13-2012, 12:43 PM   #5
Class 4 Laser
 
lasersbee's Avatar
 
Join Date: Sep 2008
Location: 2 months of Non Stop Neg Repping By ARG-Cyp-Trevor-Jacob32123 REP SYSTEM ABUSE
Posts: 14,835
Rep Power: 450
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: Help with voltage monitor alarm please.

Here's a little circuit to get you started...

Circuit

It is a basic Voltage comparator circuit...


Jerry
__________________

J.BAUER Electronics Home Page


LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See then all here on LPF

LaserBee Power Meter products ALWAYS in Stock and
discounted for LPF Members....
2W LaserBee A Laser Power Meter
LaserBee 2.5W USB LPM

LaserBee 3.7W USB LPM

Available on eBay:Check availability here..

Search


This banner is available to and can be copied/used FREE by any LaserBee owner

Last edited by lasersbee; 01-13-2012 at 12:44 PM. Reason: Spelling errors
lasersbee is offline   Reply With Quote
Old 01-13-2012, 06:12 PM   #6
Class 3R Laser
 
Le Quack's Avatar
 
Join Date: Dec 2011
Location: Buffalo, NY
Posts: 1,192
Rep Power: 101
Le Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond repute
Send a message via MSN to Le Quack
Default Re: Help with voltage monitor alarm please.

Op amps =/= comparator...

Comparators are useful for making noisy signals very square; or, quite simply, to compare two voltages.

It goes something like this;

There are 3 pins on a comparator; + , - , and out

When the voltage on the + pin is greater than the - pin, it will output a positive voltage.

If the voltage on the - pin is greater than the pin, it will output either a negative voltage, or nothing.

By using a voltage divider, a la potentiometer, you can simply take the output of the wind generator, hook it up to the comparator's + input, and the - input to the voltage divider...

For example, if the voltage divider puts out 12 volts to the - pin...
While the wind turbine is putting out 10. The comparator will NOT be outputting anything, and thus the alarm/light will be out.

If the wind turbine is putting out 13 volts, the comparator would output a positive voltage;

This can be used to turn a relay on or off too, actually, if you want it to automatically stop charging...

Last edited by Le Quack; 01-13-2012 at 06:12 PM.
Le Quack is online now   Reply With Quote
Reply


Database of Laser Pointer Companies




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
Trackbacks are On
Pingbacks are On
Refbacks are On









Loading


laser pointer forums top





Top 50 Laser Pointer Companies - Green Lasers Top 50 Laser Pointer Companies - Blue Lasers Top 50 Laser Pointer Companies - Red Lasers
Top 50 Laser Pointer Companies - Yellow Lasers Top 50 Laser Pointer Companies - Purple Lasers Top 50 Laser Pointer Companies - Orange Lasers
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes









































All times are GMT. The time now is 10:59 AM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2014 Laser Pointer Forums, LLC