Ideas for lighting this meter?

Discussion in 'General Electronics Chat' started by spinnaker, Nov 12, 2017.

  1. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    5,907
    2,313
    Building an analog meter clock. I have some of these retro metere.

    upload_2017-11-12_22-40-13.png

    They are not lite and I need soe ideas on how I might light them.

    I tried a standard LED behind the plate but it was useless. I swear I had a whole bag of bright whites once but I think they ran off somewhere. Don't know if a bright white would do any better.
     
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    6,540
    1,048
    Last edited: Nov 13, 2017 at 2:38 AM
    cmartinez and spinnaker like this.
  3. Lyonspride

    Member

    Jan 6, 2014
    72
    10
    I think I'd be tempted to paint the back of the dial with clear UV reactive paint and put some UV leds behind it.... You should get an even matt green/yellow effect, it'll either look cool or it'll look crappy.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    7,280
    1,524
    1) Make the dial from clear plastic, engrave the scale/markings on the plastic, edge light the dial with SMD LEDs?
    2) Make the dial from electro-luminescent sheet.
     
  5. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,763
    2,671
    Take the scale out
    scan it
    print it on plain paper
    cut it out
    stick it to a thin sheet of plastic
    cut the plastic out
    place the new cutout plastic+paper scale in place of the old one
    put an led behind the scale
     
  6. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    3,210
    4,187
    Since it's retro, how about an LED powered miniature version of a billboard lamp:

    [​IMG]
     
  7. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    5,907
    2,313
    This stuff looks interesting.

    https://www.ebay.com/itm/12V-A5-Siz...d=291996399296&_trksid=p2385738.c100677.m4598

    Once cut is it one sheet per cut? Way more than I need if I need to use 3 sheets ut buying one sheet for 3 meters won't be bad.


    Another idea I just had was to cut my panels out of translucent lexan. And if I can find it, print scale on stick on transparency.
     
  8. SLK001

    Senior Member

    Nov 29, 2011
    1,036
    362
    Tape a flashlight in front of the dial.
     
  9. cmartinez

    AAC Fanatic!

    Jan 17, 2007
    4,345
    4,862
    I'm with Dodgy on this one. To make sure that the LED lights things up evenly, sand it thoroughly with 400 grit sand paper, so as to diffuse its light. Some people chop off the LED's top, which acts as a lens, to diffuse its light even more.
     
    Dodgydave likes this.
  10. GopherT

    AAC Fanatic!

    Nov 23, 2012
    7,501
    6,239
    Remove the whole thing and just use a backlit color LCD panel to display an artists rendering of an analog meter.
     
  11. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    5,907
    2,313


    I wish there was a dislike button!

    :)
     
    GopherT and cmartinez like this.
  12. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    5,907
    2,313
    There is printable vellum card stock available. I think I will pick some up.
     
    GopherT likes this.
  13. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    5,907
    2,313
    Though an idea for a future project. :)
     
  14. GopherT

    AAC Fanatic!

    Nov 23, 2012
    7,501
    6,239
    Hey, call it an out-of-the-box option. Or maybe a box redesign.
     
  15. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,089
    343
    I would think a couple of LED's just below the movement would work.
    For the proper vintage look I think you'd want a mix of green and yellow.
     
    cmartinez likes this.
  16. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    7,280
    1,524
    If you can't find it, you can print in reverse on a sliced-open laminator pouch then iron that on to the lexan.
     
  17. panic mode

    Senior Member

    Oct 10, 2011
    1,456
    369
    Last edited: Nov 15, 2017 at 7:27 AM
    spinnaker likes this.
  18. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    5,907
    2,313
    I found 67# vellum WAY more sheets than I need but they have it here locally. And adhesive transparencies do exist. I had some in my hands but the line was so long I figured I would pick it up when I pick up the vellum. All they had was light weight vellum in the store I was in.
     
  19. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    5,907
    2,313
    How do you determine current limit resistors of this stuff or don't you need to worry about it?
     
  20. panic mode

    Senior Member

    Oct 10, 2011
    1,456
    369
    no...this is using very little current but requires high voltage, high frequency source - which means use of tiny inverter.
     
Loading...