[simpits-tech] Resistor for LEDs?

[Ben Jones]

not a problem jay,

 give me a while  and i should have a small  rough diagramme for you to
follow,

with this way of wiring up a main 12v buss any thing 12 v can be hooked up
to it ,
just make sure your transformer can handle the full load.

ben



----- Original Message -----
From: "Joseph Fagner" <crease-guard@attbi.com>
To: <simpits-tech@simpits.org>
Sent: Thursday, December 26, 2002 12:26 PM
Subject: RE: [simpits-tech] Resistor for LEDs?


> Hey Ben, I am planning on using some different power supplies I found on
> eBay that provide both 5 and 12 volts and were used for disk drive
> enclosures.  Could you diagram what your saying as it's hard to
> visualize, but a picture goes a long way.  I would like to uses this way
> to power my back lighting as well.
>
> Thanks
> Jay
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of Ben Jones
> Sent: Wednesday, December 25, 2002 8:29 AM
> To: simpits-tech@simpits.org
> Subject: Re: [simpits-tech] Resistor for LEDs?
>
> Guys,
>
> Can i suggest from a electrical background , not using your computer
> power
> supply to power led's and there associated resistors,
> for the simple factor that if you have a "misfortune" with a led or
> associated wiring having a blow out or melt down , this could cause the
> power supply to your pc to either fail or cause dammage to the boards if
> a
> spike was created.
>
> the power supplys being load dependant will constantly vary the amperage
> tho
> maintain a constant voltage, if there was any big load changes on the
> supply
> there is a chance that your led's will vary in light intensity being
> given
> off..
>
> My suggestion to solve this problem ( or anticipated problem) is to have
> a
> separate filtered and proctected powersupply being of 12 v dc ,
> supplying
> your leds by a 12 v bus ( a parallel circuit)  , this is easy to tap off
> the
> 12 v needed take the active through your switched contact to turn the
> led
> off and on , then through the  power dissapation resistor  onto the led
> and
> out to  the 12v bus neutral,  because this is all in parallel  only the
> 1
> wattage resistor is needed for each led , and because the supply is
> constant
> where ever you tapp off ( given the powersupply can handle the full load
> plus 10%) there should be no drop in intensity throught each led , as
> would
> the cas be in a series circuit.
>
> The only reason i suggest this is because the power supply is feeding
> some
> pretty expensive gear and it works best just powering the computer,
> which is
> the way it was designed for.
>
> If there is any electronic techo's out there please correct me if i'm
> wrong..
>
> regards
>
> ben
>
> ****************************
> bjones@pipecomp.com.au
> *****************************************
>
>
> ----- Original Message -----
> From: "Joseph Fagner" <crease-guard@attbi.com>
>
> > That's simple, don't really need to know the load, just use an free
> > molex connector from one of the systems running your simulator.  Your
> > computer will provide the load.
>
>
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