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

Tom Miller tmiller at skylinenet.net
Tue Sep 18 19:46:27 UTC 2012


That's because the signs are scanned/multiplexed displays. It is not 60/120 
Hz flicker.

Tom

----- Original Message ----- 
From: "Ryan Szekeres" <ryan.szekeres at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Tuesday, September 18, 2012 3:38 PM
Subject: Re: [time-nuts] Hi Power LED Light power supply...


On Tue, Sep 18, 2012 at 2:27 PM, gary <lists at lazygranch.com> wrote:
>
> 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.
>

This is very evident on the new L train cars in Chicago. They have a
multicolor LED sign for listing the train destination. For me at least
the signs are unreadable when I try to read them from another moving
train and hard to read from a platform when the structure vibrates.


-- 
Ryan Szekeres
KB9TQN

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