Green light flashes

Ron Ortiz · 06-21-2010, 08:05 AM

ESPN2 had a great slow motion shot of Gary Emmons going into a wheelstand as they explained what bracket racing is from the Bristol event yesterday. Did anybody notice that the green light on the tree is actually flashing. I never knew that! You learn something all the time.

Ron Ortiz
U/SA I wish I could do a wheelstand.

Mark Markow · 06-21-2010, 08:30 AM

i noticed that the led lights do that in super slow mo.

X-TECH MAN · 06-21-2010, 08:57 AM

[QUOTE=

Ron Ortiz
U/SA I wish I could do a wheelstand.[/QUOTE]

Put a BIG Hemi in it................

Harry 6674 · 06-21-2010, 09:09 AM

Quote:

Originally Posted by X-TECH MAN

Put a BIG Hemi in it................

I believe you can do the same thing with a hand held digital tachometer when you shoot it at a fluorescent light. I could be mearureing the hertz.

Tom Goldman · 06-21-2010, 03:06 PM

LED's opperate on DC voltage. ...if they were visably flashing on the ultra slo mo. ,it's possibly from the rectifier bridge being used in the power supply. .....Another possibility ,altho I doubt NHRA would be this sophisthicated is they are using pulse width modulation to dim the lamps......That would eliminate the need for those hi tech flood lamps the use on the tree at night !!.................Yes, I was an electronics geek in a past life. .....Tom

SuperStock 1890 · 06-21-2010, 07:22 PM

Tom,
That would be a cheapie power supply not to have an R/C filter or correctly sized one for smoothing the output. It also depends if you are rectifying single phase input or triple phase input. Electronics geek many years ago too. Brings back my days of building Heathkit TVs and radios. It doesn't matter. I cannot cut a light.

Rich

Jeff Foster · 06-21-2010, 11:37 PM

Only the Green lights at NHRA national events have the flicker, They are an off the shelf item built by the same company that builds the Ambers as sold by Jeg's and other suppliers. You are right the use just a half wave rectifier to fire the LEDs. The Amber's and Red,s are built by us at Compulink and include a full bridge rectifier in our DC power supply built inside each bulb
Jeff Foster
Compulink Timing

Tom Goldman · 06-22-2010, 09:48 PM

Quote:

Originally Posted by SuperStock 1890

Tom,
That would be a cheapie power supply not to have an R/C filter or correctly sized one for smoothing the output. It also depends if you are rectifying single phase input or triple phase input. Electronics geek many years ago too. Brings back my days of building Heathkit TVs and radios. It doesn't matter. I cannot cut a light.

Rich

Hey Rich, I dont think anone under 50 will know what a Heathkit is.....Built a few myself ,shortwave radio, guitar amps.,learned a lot from them. .....Tom

Bernie Cunningham · 06-22-2010, 10:36 PM

SOOOOO, Jeff,

What happens at Divisional tracks! Don't they have their own tree and what kinda bulbs do they use????

I don't think that a big percentage of racers realize that you bring in a different tree for the Nationals.

Jeff Foster · 06-23-2010, 03:37 PM

Most if not all Division tracks have our (compulink) LED's. if not each DD has a complete set of amber's with them.

06-21-2010, 08:05 AM	#1
Ron Ortiz Senior Member Join Date: Feb 2002 Location: Englewood, Florida Posts: 989 Likes: 35 Liked 317 Times in 103 Posts	Green light flashes ESPN2 had a great slow motion shot of Gary Emmons going into a wheelstand as they explained what bracket racing is from the Bristol event yesterday. Did anybody notice that the green light on the tree is actually flashing. I never knew that! You learn something all the time. Ron Ortiz U/SA I wish I could do a wheelstand. __________________ Ron Ortiz 2102 STK

06-21-2010, 08:30 AM	#2
Mark Markow Senior Member Join Date: Apr 2008 Location: east hartford ct. Posts: 539 Likes: 0 Liked 9 Times in 3 Posts	Re: Green light flashes i noticed that the led lights do that in super slow mo. __________________ Mark Markow 171 ss/tb

06-21-2010, 08:57 AM	#3
X-TECH MAN Banned Join Date: Dec 2007 Location: Lake Placid, Florida Posts: 3,203 Likes: 1,047 Liked 235 Times in 110 Posts	Re: Green light flashes [QUOTE= Ron Ortiz U/SA I wish I could do a wheelstand.[/QUOTE] Put a BIG Hemi in it................

06-21-2010, 03:06 PM	#5
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,477 Likes: 891 Liked 882 Times in 236 Posts	Re: Green light flashes LED's opperate on DC voltage. ...if they were visably flashing on the ultra slo mo. ,it's possibly from the rectifier bridge being used in the power supply. .....Another possibility ,altho I doubt NHRA would be this sophisthicated is they are using pulse width modulation to dim the lamps......That would eliminate the need for those hi tech flood lamps the use on the tree at night !!.................Yes, I was an electronics geek in a past life. .....Tom __________________ Tom Goldman 1500 SG , 1506 STK

06-21-2010, 07:22 PM	#6
SuperStock 1890 Junior Member Join Date: Aug 2005 Posts: 87 Likes: 0 Liked 0 Times in 0 Posts	Re: Green light flashes Tom, That would be a cheapie power supply not to have an R/C filter or correctly sized one for smoothing the output. It also depends if you are rectifying single phase input or triple phase input. Electronics geek many years ago too. Brings back my days of building Heathkit TVs and radios. It doesn't matter. I cannot cut a light. Rich

06-21-2010, 11:37 PM	#7
Jeff Foster Junior Member Join Date: Jan 2003 Posts: 74 Likes: 0 Liked 0 Times in 0 Posts	Re: Green light flashes Only the Green lights at NHRA national events have the flicker, They are an off the shelf item built by the same company that builds the Ambers as sold by Jeg's and other suppliers. You are right the use just a half wave rectifier to fire the LEDs. The Amber's and Red,s are built by us at Compulink and include a full bridge rectifier in our DC power supply built inside each bulb Jeff Foster Compulink Timing

06-22-2010, 10:36 PM	#9
Bernie Cunningham Senior Member Join Date: Jun 2002 Location: Southern California Posts: 560 Likes: 45 Liked 52 Times in 17 Posts	Re: Green light flashes SOOOOO, Jeff, What happens at Divisional tracks! Don't they have their own tree and what kinda bulbs do they use???? I don't think that a big percentage of racers realize that you bring in a different tree for the Nationals. __________________ Bernie Cunningham 7053 STK

06-23-2010, 03:37 PM	#10
Jeff Foster Junior Member Join Date: Jan 2003 Posts: 74 Likes: 0 Liked 0 Times in 0 Posts	Re: Green light flashes Most if not all Division tracks have our (compulink) LED's. if not each DD has a complete set of amber's with them.