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Closeup of the 3M section This is just a basic closeup on the yellow section of the 3M signal. I have removed the wire shield in this picture to reveal the electrical terminations. In the back of the signal are the two lenses, the frosted diffuser mounted over a clear optical limiter that actually has the programming tape on it. Each section is interconnected, and has it's own connection block, and the field wire hook up is in the bottom section. The device to the left of the block is a photocell that dims/brightens the lamp. Keywords: Traffic_Lights

Closeup of the 3M section

This is just a basic closeup on the yellow section of the 3M signal. I have removed the wire shield in this picture to reveal the electrical terminations. In the back of the signal are the two lenses, the frosted diffuser mounted over a clear optical limiter that actually has the programming tape on it. Each section is interconnected, and has it's own connection block, and the field wire hook up is in the bottom section. The device to the left of the block is a photocell that dims/brightens the lamp.

DSCN3359.JPG DSCN3360.JPG DSCN3361.JPG DSCN3362.JPG DSCN3363.JPG
File information
Filename:DSCN3361.JPG
Album name:basilicon89 / Interior shots of my signals
Keywords:Traffic_Lights
Filesize:139 KiB
Date added:Jan 07, 2011
Dimensions:986 x 740 pixels
Displayed:188 times
Color Space:sRGB
Contrast:0
DateTime Original:2011:01:07 14:49:26
Exposure Bias:0 EV
Exposure Mode:0
Exposure Program:Program
Exposure Time:1/60 sec
FNumber:f/2.8
Flash:Red Eye, Auto-Mode
Focal length:6.2 mm
ISO:64
Light Source:Unknown: 0
Make:Nikon
Max Aperture:f/2.8
Model:COOLPIX L11
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=4579
Favorites:Add to Favorites

Comment 1 to 6 of 6
Page: 1

rjluna2   [Jan 08, 2011 at 06:10 PM]
I have always wonder what it looks like inside of the specific lane traffic signal. Thanks for showing the guts! Cool
basilicon89   [Jan 08, 2011 at 06:33 PM]
your welcome. The official name for this signal is "Optically Programmable Visibility" Shortened to PV or HVS for High Visibility Signal
Tmcdllr   [Jan 14, 2011 at 12:59 PM]
How does the dimming part work and why would it need to be dimmed?
SeanB~1   [Jan 14, 2011 at 02:55 PM]
Dimming the lamp at night is a good idea to increase lamp life and not to blind the drivers approaching. It probably is a simple photocell controlling a triac dimmer, as the outdoor light gets brighter the photoresistor goes lower resistance and the triac fires earlier and makes more power into the lamp load. At night the resistance is high, and the lamps dim down to a lower level. This is probably in the common lead to all the lamps.
basilicon89   [Jan 14, 2011 at 05:01 PM]
SeanB basically described it in a nutshell. The resistor is in the back lamp housing. There isnt much of a huge range between full brightness and fully dimmed. But the photocells hum when they are active and my signal is constantly humming since the basement is darker then a bright sunny day. However I believe its done at the hot lead. I have to check sometime.
Form109   [Apr 19, 2011 at 04:02 AM]
intreasting is this a very loud hum?

Comment 1 to 6 of 6
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