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.

Re: Green light flashes
 

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

Re: Green light flashes
 

[QUOTE=

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

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

Re: Green light flashes
 

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.

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

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

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

Re: Green light flashes
 

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

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.

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.