[time-nuts] Hi Power LED Light power supply...

[DaveH]

That is a very fun prank to do.

Show someone an o'scope with a flat line on it and hand them a pretzel or
carrot.  

Tell them that you have implanted several sensors into their brain and you
want to calibrate them starting with mandibular vibration. 

I have seriously freaked some people out with this one.

Dave

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of gary
> Sent: Tuesday, September 18, 2012 12:28
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Hi Power LED Light power supply...
> 
> There are ways for the flicker to be more evident. Don't laugh, but 
> chewing something hard like a pretzel can bring out the flicker. 
> Basically you can get beat patterns between the vibration of your eye 
> and the light flicker.
> 
> There is a common problem with DLP projectors that use color 
> wheels. You 
> will see reviewers shaking their heads and eat crunchy food 
> in order to 
> see "rainbows" on the screen.
> 
> A similar problem occurs with matrixed LED displays mounted 
> on machinery 
> that has vibration. Very common in industrial controls since 
> they like 
> LEDs for readability.
> 
> When I designed the 2nd generation LED display drivers, I bumped the 
> refresh rate to 500Hz min. That was about 2x the frequency 
> where I ran 
> out of convoluted experiments to detect flicker.
> 
> On an analog scope, you can display a flat line and have it wiggle by 
> eating something crunchy. I don't have an analog scope on the 
> bench at 
> the moment, otherwise I would figure out the right 
> circumstances to make 
> that happen.
>