DIY Lamp with Backlight Votlmeter

Reply

  #1  
Old 09-26-15, 08:57 AM
Member
Thread Starter
Join Date: Sep 2015
Location: Bulgaria
Posts: 6
Received 0 Votes on 0 Posts
DIY Lamp with Backlight Votlmeter

Members location is Bulgaria.

Hi All,

I recently completed my second steam-punk pipe lamp with a water valve controlled dimmer and a functioning voltmeter. However, being the restless type I came across an analog voltmeter with a backlight, which would be a great addition to the project. My issue is how to connect the LED light of the voltmeter to my existing circuit? I'm an amateur when it comes to electronics...
The setup currently:
220v input, through a dimmer switch connected in series (on the live wire), then the current voltmeter connected in parallel and a light bulb.
The LED for the backlight voltmeter I found has these specs:
Led Lamp voltage : 6-12VAC/DC
need the resistor :10-50Ω 1/4W ,if VAC 10-12V
Due to the specifics of my setup my only choice is to connect the LED to the existing 220v circuit. Will that be possible? Can I perhaps use THIS driver?
Thanks for the help!
Name:  12036859_10153271009486871_7304739083796880315_n.jpg
Views: 202
Size:  51.3 KB
Name:  12027790_10153271009511871_8615622107360856240_n.jpg
Views: 213
Size:  50.3 KB
 

Last edited by ray2047; 09-26-15 at 09:26 AM.
Sponsored Links
  #2  
Old 09-26-15, 06:24 PM
Member
Join Date: May 2015
Location: USA
Posts: 3,138
Received 1 Vote on 1 Post
The driver you link to should work. You may still need the series resistor; there isn't enough info about the driver to know for sure. Putting the resistor in series with the output of the driver would be safest to test it out so you don't overdrive and damage the LED. There are many other ways to do this, but none of them will be as cheap as that driver.

Cool lamp by the way!
 
  #3  
Old 09-26-15, 11:55 PM
Member
Thread Starter
Join Date: Sep 2015
Location: Bulgaria
Posts: 6
Received 0 Votes on 0 Posts
Thanks for the reply!
Im not necessary looking for the cheapest way, rather the most compact and easiest in terms of connecting Is it a problem that current flowing to the driver will be 0-220v since its coming from the dimmer?
 
  #4  
Old 09-27-15, 05:45 AM
Member
Join Date: May 2015
Location: USA
Posts: 3,138
Received 1 Vote on 1 Post
One can't tell from the info provided what the driver will do when the input voltage drops below 180 volts. Most likely it will just stop working, which means the backlight will go off when the dimmer is set low. This would be true for most other solutions (such as a step down transformer, or a 220 to 12VDC power supply) as well. The only practical way to have the backlight work regardless of dimmer setting is to not power it from the dimmer, but just power it always from 220 by connecting it before the dimmer. Of course, that means it won't turn off when the dimmer switch is off.
 
  #5  
Old 09-27-15, 07:16 AM
Member
Thread Starter
Join Date: Sep 2015
Location: Bulgaria
Posts: 6
Received 0 Votes on 0 Posts
Thanks, that sounds good actually - I don't mind having the light switch after 180v only. Ok, seems the only thing left is to order this thing and test it Will post results! Thanks again.
 
Reply

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


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: